Foraminifera of the Monterey Shale 

and Puente Formation, Santa Ana 

Mountains and San Juan Capistrano 

Area, California 

GEOLOGICAL SURVEY PROFESSIONAL PAPER 294-M 
Foraminifera of the Monterey Shale 

and Puente Formation, Santa Ana 

Mountains and San Juan Capistrano 

Area, California 

By PATSY BECKSTEAD SMITH 

SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY 

GEOLOGICAL SURVEY PROFESSIONAL PAPER 294-M 

UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1?60 
UNITED STATES DEPARTMENT OF THE INTERIOR 

FRED A. SEATON, Secretary 

GEOLOGICAL SURVEY 

Thomas B. Nolan, Director 

For sale by the Superintendent of Documents, U.S. Government Printing Office 

Washington 25, D.C. - Price 40 cents (paper cover) 
CONTENTS 

AbstracL-------------~---------------------------- Introduction ______________________________________ _ 

Acknowledgments ______________________________ _ 

Previous work _________________________________ _ 

Preparation of samples _____________________________ _ 

General geology ____________________________________ ·_ 

Stratigraphy ___________________________________ _ 

Structure _____________________________________ _ 

Faunas ___________________________________________ _ 

Miocene Foraminiferal stages of Kleinpell (1938) __ _ 

Miocene stages of the Santa Ana Mountains and 

San Juan Capistrano area _________________ _ 

Relizian(?) stage _______________________ _ 

Luisian stage __________________________ _ 

Mohnian stage _________________________ _ 

Geographic divisions ___________________________ _ 

Northern and central Santa Ana Mountains ___ _ 

Southwestern Santa Ana Mountains __________ _ 

Area east of Oso Creek _____________________ _ 

Page 

463 

463 

464 

464 

464 

464 

464 

466 

466 

466 

466 

466 

466 

467 

468 

468 

470· 

470 

Faunas-Continued 

Geographic divisions-Continued 

Area west of Oso Creek _____________________ _ 

Faunal summary _______________________________ _ 

Correlation of formations and stages _________________ _ 

Conclusions _______________________________________ _ 

Systematic catalog _________________________________ _ 

Family Lagenidae ______________________________ _ 

Family N onionidae _____________________________ _ 

Family Buliminidae ____________________________ _ 

Family Rotaliidae ______________________________ _ 

Family Cassidulinidae __________________________ _ 

Family Chilostomellidae ________________________ _ 

Family Globigerinidae __________________________ _ 

Family Anomalinidae ___________________________ _ 

Foraminifera localities, Santa Ana Mountains and San 

Juan Capistrano area _____________________________ _ 

References ________________________________________ _ 

Index ____________________________________________ _ 

ILLUSTRATIONS 

Page 

473 

476 

478 

478 

480 

480 

481 

481 

485 

487 

488 

488 

488 

488 

491 

492 

PLATES 57-59. Foraminifera of the Monterey shale and Puente formation ____________________________________ Following index 

FIGURE 155. Index map and map showing distribution of the Puente formation in the Santa Ana Mountains ___________ _ 

156. Map of the Monterey shale and Puente formation in the San Juan Capistrano area and structure section across the Capistrano syncline __________________________________________________________________ _ 

157. Columnar sections of middle and upper Miocene rocks _______________________________________________ _ 

TABLES 

Page 

465 

471 

479 

TABLE 1. Test wells and core holes sampled and measured__________________________________________________________ 463 

2. Stages and foraminiferal zones of the Miocene of California ___________ "7 _____________________________ - _- _--- 467 

3. Distribution of Foraminifera from the northern Santa Ana Mountains ________________________________ - __ - _ _ 469 

4. Distribution of Foraminifera from the southwestern Santa Ana Mountains___________________________________ 470 

5. Distribution of Foraminifera from the area east of Oso Creek______________________________________________ 472 

6. Distribution of Foraminifera from Shell Oil Co.'s Mission contrafiush No. 38--------------------------------- 473 

7. Distribution of Foraminifera from Shell Oil Co.'s Moulton core hole No. 14__________________________________ 474 

8. Distribution of Foraminifera from the area west of Oso Creek ___________________________________________ -__ 4 7 5 

9. Distribution of Foraminifera from Shell Oil Co.'s Moulton contrafiush No. 32________________________________ 476 

10. Geologic ranges of more important Foraminifera__________________________________________________________ 477 

Ill 
SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY 

FORAMINIFERA OF THE MONTEREY SHALE AND PUENTE FORMATION, SANTA ANA 

MOUNTAINS AND SAN JUAN CAPISTRANO AREA, CALIFORNIA 

By PATSY BECKSTEAD SMITH 

ABSTRACT 

In the Santa Ana Mountains and San Juan Capistrano area, 

Orange County, Calif., thick sections of Miocene sedimentary 

rocks are exposed. '!'hey are assigned to the Monterey shale. 

of middle and late Miocene age and the Puente formation of 

late Miocene age. The area described is divided into four 

geographic units: the northern and central Santa Ana Mountains, the southwestern Santa Ana Mountains, the area east 

of Oso Creek (east flank of the Capistrano syncline), and the 

area west of Oso Creek (west flank of the Capistrano syncline). 

The faunal assembl·ages of each area are compared with those 

of the California Miocene stages proposed by Kleinpell ( 1938). 

In the Santa Ana Mountains, the Topanga formation (Relizian (?) stage) and the El l\1odeno volcanics (Luisian stage) 

are oyerlain Ull(:Onformably by the Puente formation (Mohnian stage). 

On the east flank of the Capistrano syncline, south of the 

El Toro Air Station, the ·Topanga formation is overlain by the 

Monterey shale, which ranges in age from late Luisian at the 

base to l\fohnian at the top. 

To the west of Oso Creek, the Topanga formation is overlain 

by the Monterey shale which ranges in age from early Luisian 

at the base to late Luisian and Mohnian at the top. 

Changes in thicknesses of rocl\:s assigned to the Luisian ·and 

Mohniah stages are due to unconformities and local depositional 

variations. No evidence was found to indicate that foraminiferal faunas assigned to the Mohnian stage grade laterally into 

faunas of the Luisian stage. 

INTRODUCTION 

The U.S. Geological Survey carried on oil and gas 

investigations in and near the Santa Ana Mountains, 

Orange County, Calif. (index map, fig. 155), from 

1949 to 1955, and during this time, many hundred foraminiferal samples from this area were collected and 

examined. This report is a result of a study of Foraminifera of the :Monterey shale and Puente formation. 

The stratigraphic and geographic distribution of the 

Foraminifera is discussed. 

Foraminiferal sa.mples were collected by D. M. IGnney, J. E. Schoellhamer, R. F. Yerkes, J. G. Vedder, 

a.nd the author, all of the U.S. Geological Survey. The 

localities sampled are shown on the accompanying 

maps (figs. 155 and 156) and are · described on 

p. 488-490. The maps also show areas of outcrop of 

upper middle and upper Miocene rocks and the locations of test wells and core holes that were used in constructing the structure section and that were sampled 

for Foraminifera. These wells and core holes are listed 

in table 1. 

TABLE I.-Test wells and core holes sampled and measured 

Well No. Elevation Total depth (on 

·maps) Operator and name of well Location (feet) (feet) 

1 Shell Oil Co., lVIoulton contraflush No. 3L_ vV est of Aliso Creek, Capistrano area (fig. 156) ______ 330 728 

2 Shell Oil Co., Moulton core hole No. 14 ____ Between Aliso and Oso Creeks (figs. 156, 157; table 190 2, 723 

7). 

3 Shell Oil Co., Moi1lton contraftush No. 35 __ Oso Creek, Capistrano area (fig. 156) _______________ 311 895 

4 Shell Oil Co., :Mission contraftush No. 36 __ Between Oso Creek and Arroyo Trabuco (fig. 156) ___ 446 799 

5 Shell Oil Co., Mission contraftush No. 37 __ Between Oso Creek and Arroyo Trabuco (fig. 156) ___ 684 698 

6 Shell Oil Co., Mission contraftush No. 38 ___ Arroyo Trabuco (figs. 156, 157; table 7) _____________ 462 766 

7 McKee Oil Co., Kokx Community No. 8-1 Southwest of Burruel Ridge (fig. 155) ______________ 280 4, 005 

8 Rubicon Oil Co., Wilcox No. L ___________ South of Santa Ana River (figs. 155 and 157) ________ 450 6, 324 

9 G. D. Murdoch, Howell No.!_ ___________ South of Santa Ana River (fig. 155) _______________ 308 4, 370 

10 Shell Oil Co., Moulton contraftush No. 32 __ West of Aliso Creek (fig. 156 and table 9) ___________ 165 623 

463 
464 SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY 

ACKNOWLEDGMENTS 

Valuable information provided by G. H. Doane and 

M. vV. Hurley of the Shell Oil Co., ~I. L. Na.tland and 

W. T. Rothwell of the Richfield Oil Corp., and W. H. 

Holman of the Standard Oil Co. of California is gratefully acknowledged. R. M. l{leinpell of the University 

of California at Berkeley ga.ve helpful advice and assisted on taxonomic problems. The .Jones microsplitter used in prepa.ring samples was borrowed from the 

California Institute of Technology. 

PREVIOUS WORK 

Published reports on Foraminifera of Miocene age 

from this area are very brief and consist chiefly of 

stratigraphic sections and correlations with more 

thoroughly studied faunas in other parts of Cali-

·fornia. Reed and Hollister (1936, p. 114-124) discuss the distribution of Miocene sedimentary rocks 

in the Los Angeles basin and give columnar stratigraphic sections of the Tertiary rocks of the Santa Ana 

Mountains and San Joaquin Hills. Kleinpell ( 1938, 

p. 124-127) mentions the presence of rocks of middle 

and upper Miocene age in the Santa Ana Moqntains 

and in the Laguna Beach area. · 

PREPARATION OF SAMPLES 

Samples from 59 localities and three core holes (figs. 

155 and 156, and locality list, p. 488-490) were strtdied. 

Surface samples were collected, where possible, in stratigraphic sequence. Where systematic sampling was not 

possible, samples were arranged in stratigraphic sequen9e on the basis of available geologic information. 

No uniform method was used in collecting surface 

samples, and no consistent attempt was made to sample 

only a single stratigraphic interval or to take equaf 

amounts of material from each locality. Approximately 150 ml of each sample was washed. Composite 

samples of 20- to 30-foot intervals were taken in core 

holes, and 150 ml of material was washed. The material from eacl~ sample was washed on 150-mesh 

screens ( 0.105 mm openings) ; the residue was then dried 

and concentrated by flotation in carbon tetrachloride. 

Care was taken throughout the operation to avoid contamination. Most samples were not examined before 

washing and it is possible that some forms such as 

the upper l\1ohnian guide, Cassidulinella renulinaformis Na.tland, may have been missed. However, in 

those samples which were examined unwashed, no forms 

were noted which were not seen in the washed sample. 

The washed and floated samples were then split with 

a .Jones microspliter as described by Otto ( 1933) until · 

a fraction containing 150 to 200 individuals remained. 

This commonly required 6 to 10 splits of the original 

sample. The specimens in the final fraction were then 

mounted systematically on slides. The remaining portion of the washed sample was examined for species 

not found in the final split, and specimens of any rare 

species found were mounted separately. 

Tables showing distribution (Nos. 3-9) were prepared from these slides, with samples listed as nearly 

possible in stratigraphic sequence. The percentage of 

each species present is represented by a symbol. Total 

population was calculated on the basis of the number of 

splits and is given on the table of distribution for each 

sample. 

Some forms were found which, because of poor preservation. or a slight difference from the typical form, 

could not be positively referred to a described species. 

If these variants appeared to have stratigraphic significance, such as N onion afl'. N. costiferum (table 3) 

they were listed separately on the distribution tables. 

However, if the variant lacked stratigraphic significance, it was included with the typical form, with its 

aberrant nature indicated by cf. after the abundance 

symbol. All such variations from typical forms are 

discussed in the systematic part of this paper. 

GENERAL GEOLOGY 

STRATIGRAPHY 

The marine sedimentary rocks of the northern and 

central Santa Ana Mountains (fig. 155) range in age 

from Triassic to Pliocene (Woodford and others, 1955). 

Middle and late Miocene time is represented in the 

Santa Ana Mountains and the San Juan Capistra-no 

area by thick sequences of marine sandstones, siltstones, 

and shales. The oldest formation discussed in this 

report is the Topanga formation, which contains typical middle Miocene molluscan faunas. The Topanga 

formation, consisting almost entirely of sandstone, is 

present in nearly the entire a.rea. 

Locally in the San Juan Capistrano area, the Topanga formation is overlain by remnants of the San 

Onofre breccia of middle Miocene age. The Topanga 

formation and the San Onofre breccia are overlain by 

the Monterey shale. The Monterey, containing rich 

foraminiferal faunas, is late middle and late Miocene 

in age, and consists of diatomaceous shales and siltstones. 

In the Santa Ana Mountains, the El Modeno volcanics of late middle Miocene age (Yerkes, 1957) 

locally overlie the Topanga formation. The Puente 

formation of late l\1iocene age rests unconformably on 

the Topanga formation and the El l\fodeno volcanics. 

The Puente formation has been divided into four members ( Schoellhamer and others, 1954). The lowest 

member, the La Vida, is predominantly siltstone, and in 

most places grades upward into the Soquel member, 

which is largely sandstone. The Soquel member on 

Burruel Ridge appears to be a large lens which pinches 
FORAMINIFERA OF MONTEREY SHALE AND PUENTE FORMATION, CALIFORNIA 465 

33°50'00" 

33°47'30" 

p.NA ./ 

--···-- SANTA --... - .. _..,....·· ···-···-··· ,,... 

-··· 

0 ./;_ 

-t\1'0,.?--

sl'~...-' 

( 

/ 

.. ../ 

I / .. · 

EXPLANATION 

D Post-Puente rocks 

Puente formation 

Pre-Puente rocks 

Contact. approximately located; dotted where concealed 

Fault. .approximately located; dotted where concealed 

0 

Elevation, in feet 

? Well (table 1) 

xm14 

Foraminifera locality 

G Area of fig 155 

.JJ Area of fig 156 

!Mile L__.jl__.j____j__.l 

1----+--t-:--c----::-:-::-::-:+-33° 

0 SAN DIEGO 

118° ---116° 

INDEX MAP OF' PART OF SOUTHERN CALIFORNIA, 

SHOWING LOCATION OF' THE SANTA ANA 

MOUNTAINS AREA (FIG 155JAND THE SAN JUAN 

CAPISTRANO AREA (FIG 156) 

1 30" 117"45'()()" 

Geologic map adapted from Schoellhamer and others, 1954 

F rGUHE 155.-Inclcx map and map showing distribution of the Puente formation In the 'Santa Ana Mountains. 

out to the "·est and east. Overlying the Soquel member 

is the Yorba member (siltstone), and locally above this 

is the Sycamore Canyon member. The La Vida and 

Soquel members of the Puente formation are present in 

the syncline south of Irvine Lake. 

Along the southwest margin of the Santa Ana 

Mountains, east of El Toro Air Station, strata assigned 

to the Puente formation include the La Vida member 

and the overlying Soquel member. Southeast of the 

air station the Soquel member is no longer present and 
466 SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY 

the La Vida member becomes indistinguishable from 

rocks referred to the Monterey shale in this study (fig. 

156). 

Overlying the older rocks in the Capistrano-El Toro 

area is the Capistrano formation, of late l\'Iiocene to 

early Pliocene age. On the east limb of the Capistrano 

syncline, the Capistrano formation is conformable on 

the Monterey shale, and on the west limb, it is uneonformnble on the older rocks. 

STRUCTURE 

The marine sedimentary rocks of the Santa Ana 

Mountains (fig. 155) range in age from Triassic to 

Pliocene and are deformed into an intensely faulted 

westward-plunging anticline. This anticline is bordered on the southwest by a shallow syncline, in which 

the Puente formation is exposed south of Irvine Lake. 

Still farther south, southeast of El Toro Air Station, 

Miocene and Pliocene sedimentary rocks ar.e exposed on the east and west limbs of the southwardplunging Capistrano syncline (fig. 156a). The east 

limb of this syncline is cut by the northward-trending 

Cristianitos fault. In general, the rocks to the east of 

this fault are older than middle Miocene. West of the 

Capistrano syncline, at the east edge of the Sari J oaquin Hills, early middle Miocene and older rocks are 

exposed in the core of a large faulted anticline. 

FAUNAS 

MIOCENE FORAMINIFERAL STAGES OF KLEINPELL 

(1938) 

Kleinpell (1938) subdivided the Miocene of California into six sta.ges, which from older to younger 

are: Zemorrian, Saucesian, Relizian, Luisian, Mohnian, 

and Delmontian (table 2). Each of these stages is "a 

stratal unit independent of lithologic and faunal facies" (I\Jeinpell, 1938, p. 90), and thus represents a 

true "time-stratigraphic unit." Each stage is composed 

of several faunal zones. Each zone is characterized by 

an assemblage of Foraminifera of which one abundant 

and characteristic form is chosen as guide, and for 

which the zone is named. 

In and near the Santa Ana Mountains and San Juan 

Capistrano area the foraminiferal zones differ somewhat from those defined by Kleinpell. There is enough 

similarity, however, to permit use of the Kleinpell 

stage and zone names. Table 2 lists, in accordance with 

I\Jeinpell's nomenclature, the stages and zones found 

to be present in the Santa Ana Mountains and San 

Juan Capistrano area. Miocene stages represented in 

the Santa Ana Mountains and San Juan Capistrano 

area include the Relizian (~),Luisian, and Mohnian. 

MIOCENE STAGES OF THE SANTA ANA MOUNTAINS AND 

SAN JUAN CAPISTRANO AREA 

RELIZIAN(l) STAGE 

The Topanga formation exposed on the west flank 

of the Santa Ana Mountains conta.ins a fauna that is 

probably Relizian. Foraminifera are abundant but 

belong to only a few species, including Bolivina advena 

var., N onion costiferunt, N. aff. N. costiferum, and 

Valvulineria depressa. This fauna is best represented 

in the Burruel Ridge area. It is assigned to the Relizian stage because the fauna is not unlike the Relizian 

faunas described by I\Jeinpell (1938, p. 121), and because the rocks containing the fauna underlie rocks 

assigned to tJ:te Luisian stage. The Relizian ( ? ) faunas 

differ greatly from those of all the overlying vocks. 

LUISIAN STAGE 

The Luisian stage is cha.racterized by abunda.nt 

Siphogenerinas (present only loca.lly in this region), 

V alvulineria californica s.s. a.nd varieties, N onion costiferum, and Bolivina advena var. striatella (Kleinpell, 1938, p. 122-126). 

Siphogenerina reedi zone.-The lower part of the 

Luisian stage typically contains Valvulineria depressa 

and Bulimina pseudotorta. In the San Juan Capistrano area it is characterized by V. depressa. This is 

the highest occurrence of V. depressa. The zone is 

represented only on the west limb of the Capistrano 

syncline (table 8) . 

Siphogenerina collomi zone.-l{leinpell divides the 

upper part of the Luisian stage into the Siphogenerina 

nuciformis zone a.nd the S. collomi zone. Type specimens of these two Siphogenerina species were examined, and no satisfactory distinction could be made 

between them ( p. 485). None of the other distinctions 

between these two zones of Kleinpell can be recognized 

in this area. Therefore, the Siplwgenerina collomi 

zone as described in this report includes the interval 

between the top of the lower Luisian stage and the 

base of the Mohnia.n stage. The zone is best represented on th_~ west limb of the Capistrano syncline 

where rocks of the Siphogenerina collomi zone are conformable on beds assigned to the S. reedi zone (table 8) . 

Typica.lly, the upper pa.rt of the Luisian stage is 

characterized by Siphogenerina collomi, abundant 

Valvulineria californica s.s. and varieties, the highest 

occurrence of H emicristellaria beali, N onion aostiferum, and Bolivina imbricata (I\Jeinpell, 1938, p. 

125, 127). The zone in the Santa Ana Mountains 

region is characterized by an abundance of V alvulineria calif,ornica and varieties, "Uvigerinella" californica, Bulirnina monterey ana, Bolivina imbricata, 

N onion cmstiferum, and H emicristellaria beali. 
FORAMINIFERA OF MONTEREY SHALE AND PUENTE FORMATION, CALIFORNIA 467 

TABT.E 2.-Stage~ and foraminiferal zCYnes of the Miocene of California (ctfter Kleinpell, 1938), correlatives in the Santa Ana 

Mountains Clffl,d San Jttan Capistrano arep., and index Foramlinifera 

Stages and zones defined 

by Kleinpell (1938) 

Stage Zone 

r::: 

ell 

·.;; 

r::: 

Zones present in Zones present in San 

Santa Ana Mountains Juan Capistrano area 

Index Foraminifera in 

the Santa Ana Mountains 

San Juan Capistrana area 

s r-~-1----------------------_, __________________ -+-----------------+--------------------------~~ 

~ ~ ~ ~ ~ 0 ,3 Bolivina obliqua ·~ ~ "§, .::; 

~ r----t----lr-----------------------~-------------------i----------------~--------------- ·~ . ~ ~ ] ~ 

g; ~ Bolivina hughMi Bohmna hvghni (Nb: ;~.:;.~~tr i ·~ ·~ 1j~j1li[f r::: ~ t ~ !-- ~ .::; ~ c ·a ·~ ~ ~ :~ ·~ ,~ 

..g ~ Bul-im.in.a. uvigerina.fonnis ·~ : ~ '1 ~ ~ 

~ ~ t-----------------------1 Bulimina uvigerinaformis Bulimina ..8 .::; ~ -~ Q uvigerinaformis o .J -~~ ·~ .....:l Boliv·inct modeloeusis <::> -.:::: .:::: ::::~ 

~---~--------'--~-----------------b-r--~~~~·~ -~~t::Q-0~~~--------~ ~ Si7Jh.ogenerina collom1: " ~ §: 1--------------------------i Siphogenerina collomi Siphogenerina collomi f--.J------1--1--+--t ~ ----------1 

~ .~ ~ Siphogenerina nuciformis ~ if ~ '5 ~~-t-----------------~--~~,-----~~~--~~-~r---+-------------+-+-~ ~ ~ ~ ~ 0 ....:l Cl) ~ ~ ·~ 

.-=; 

:;;::: ~ _, j :S: Siphogenerina reedi S1:phogener1:na. reed·i ~ J; -~ ·~ .t :::::3 ~ 

Q . .., ~ "'.::l 

Q r---t--t------------------------1f-----------------_.l _____________ ~ ~ ~ ·~ ~ ·~ 1----------------l 

iJ ~ Sl:phogenet·ina. bmnneri ~ ~ ~ :~ ~ ·~ r:::"""' ~"1::l"'""""~ ell >--' ~ ~ ..... ~ ,..,..; ~ :§ Rocks of Relizian age present, zone undetermined. ~ ·~ .- -< -< --------------l 

~ <:,;) -

~ ~ ~ .::; 3 Si7Jhogenerina. hughesi ·~I] I 

'' Uvigerinella.'' obesa 

Plectoj?·ond·1:cularia 

· miocem:ca 

~1~1 ('.. 

~ Si7Jhogenerina t1·ansversa !:il 

~r--+--~----------------~ 

0 

Rocks of this age not studied for this report. 

.....:l r::: 

ell .E 

0 

E 

Cl) 

N 

'' Uvige·rinella" spa1·sicosta.ta 

Uv,£gm·ina gallowayi 

M:OHNIAN STAGE 

The Mohnian stage is characterized by the predominance of the Buliminidae and by lack of the characteristic Luisian Lagenidae and Rotaliidae mentioned 

above. 

IGeinpell divided the Mohnian stage into three zones: 

two lower, the 13 olhJina nwdeloensis zone and the 

B'llli'lnina uvigerinaforntis zone; and an upper, the Bolivina huglwsi zone. · 

Paleontologists working in the Los Angeles basin 

have replaced l(leinpell's zones with slightly different 

divisions, called "]ower", "middle", and "upper" 1\fohnian. Lower Moh.nian is marked by the occurrence of 

500860 0-G0--2 

Baggina californica, Epistominella gyroidina.formis, 

Bolivina modeloensis, and Bulimina uvigerinafo1"1111is. 

The highest occurrence of this assemblage is considered 

the top of the "lower" Mohnian. "Middle" Mohnian is 

marked by Bulimina uvigerinaformis without the three 

other forms of the lower. "Upper" Mohnian is marked 

by Bolivina "hughesi" (B. benedictensis of Pierce, 

1956). In the absence of Bolivina "hughesi" (and Bulimina uvigerinaformis), Bolivina woodringi and B. 

demtrtata are considered indicative of "upper" Mohnian, although the ranges of these two forms do 

extend down into the Bulimina u·vigerinafor"lnis 

zones. 
468 SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY 

This revised zonation is based on the fact that 

Bulimina uvigerinaformis ranges higher than the 

rest of the forms which characterize the lower Mohnian stage of Kleinpell, and therefore, B. uvigerinaformis actually characterizes two Mohnian zones. 

In this paper the two lower zones defined by Kleinpell are combined to form the Bulimina uvigerinaformis zone. 

Bulimina uvigerinaformis zone.-Kleinpell (1938, p. 

129) divides the lower Mohnian stage into two zones 

in the type area in the Santa Monica Mountains. In 

the Santa Ana Mountains, forms which normally 

characterize the B oli/oina rnwdeloensis zone (B. modeloensis, Eponides rosaformis) occur in samples along 

with Bulimina uvigerinaformis. The B. uvigerinaformis zone is here considered to include the interval 

from the top of the Luisian stage to the base of the 

upper Mohnian stage. Species characteristic of the 

lower Mohnian stage in this area are B. uvigerinaformis, Eponides rosaformis, Baggina califor·nica, 

Valvulineria cf. V. grandis, and the highest occurrence 

of Epistominella gyroidinaformis. The zone containing these species is best developed in the northern Santa 

Ana Mountains. 

Bolivina hughesi zone.-The upper Mohnian Bolivina hughesi zone (Kleinpell, 1938, p. 130) is typically 

characterized by the restricted occurrence of B. 

"hughesi," B. bramlettei, B. girardensis, and by the 

highest occurrence of B. californica and B. decurtata. 

This zone is poorly developed in the Santa Ana Mountains. Forms like Bolivina hootsi and B. girardensis, 

which normally characterize the zone, have more extended ranges here. B. "hug hesi" is rare. Only on 

Burruel Ridge can this zone be distinguished (table 3). 

GEOGRAPHIC DIVISIONS 

Because of rapid lateral facies changes in the Miocene rocks, the region covered by this report is divided 

into four areas to facilitate discussion of the faunas. 

These areas are (1) the northern and central Santa 

Ana Mountains, (2) the southwestern Santa Ana 

Mountains, ( 3) the area east of Oso Creek, and ( 4) 

the area west of Oso Creek. For each of these areas, 

the stratigraphic succession and faunal zonation were 

defined independently; lists of faunal distribution were 

prepared for each (tables 3-9). 

NORTHERN AND CENTRAL SANTA ANA MOUNTAINS 

Localities m1 to m4, in the Topanga formation, contain faunas which differ from those found in the overlying units and are in beds containing Turritella ocoyana Conrad. They are questionably assigned to the 

Relizian stage. 

Locality m5 is in a claystone bed that rests on the 

basal member of the El Modeno volcanics. The overlying members of the volcanic sequence that are present 

farther south have been removed here, and the claystone is immediately overlain by the La Vida member 

of the Puente formation. At this locality, it is difficult 

to ascertain whether this claystone is associated with 

the volcanic rocks or with the Puente formation, but 

farther south similar claystones are intercalated with 

the volcanic rocks. Its fauna is certainly very different 

from any found in the Puente formation. A very 

similar but better preserved fauna was found east of 

the mapped area, in rocks questionably assigned to the 

Topanga formation. The presence of abundant N onion 

costiferwm and Valvulineria californica var. obesa, 

and the lack of upper Miocene Bolivinas indicate 

strongly that the faunas should be referred to the 

Luisian stage. The presence of abundant Epistominella gyroidinaformis and the rare occurrence of Bulimina cf. B uvigerinaformis place these faunas near the 

the upper limit of the Luisian stage. 

Faunas of probable Luisian age occur a.t depths of 

4,011 to 4,031 feet in the G. D. Murdoch Howell No. 1 

(well 9, fig. 155) just south of the Santa Ana River. 

These faunas appear to be from the top of the Topanga formation. 

Samples m6 to m14 are from the La Vida member 

of the Puente formation. The La Vida belongs entirely 

to the Bulimina uvigerinaformis zone of the Mohnian 

stage. 

Samples m16 and m17 were collected where the 

Soquel member has pinched out and are probably 

from the Yorba member of the Puente formation. 

They are assigned to the Bolivina hughesi zone of the 

Mohnian stage. 

No determinable Foraminifera were obtained from 

the Soquel or the Sycamore Canyon members of the 

Puente formation, but crushed forms are seen on bedding planes and on weathered surfaces of calcareous 

concretions. 

The localities in the Santa Ana Mountains represented in table 3 are widely dispersed and the relative 

stratigraphic position of many of them (fig. 155) is 

uncertain. It is clear that several fairly well defined 

zones are present, but no thicknesses can be given. 

Rocks of Relizian ( ~) age have not yet been thoroughly 

studied here, and rocks of Luisian age have a small 

areal extent. The major part of the samples from this 

area that were examined are from the Puente formation of Mohnian age. Zonation of rocks of Mohnian 

age, following Kleinpell's usage, is shownin table 3. 
TABLE 3.-Distribution of Foraminifera in rocks of middle and late Miocene age from the northern Santa Ana- Mountains 

[Numbers indicate percent of total population of locality: ·,<I; ""-• 1-3; t, 4--6; X, i-10; 0, 11-15; 8, 16--20; ®, 21-30; (), 31-40; e, 41-60; 181, 61-80; •• 81-100; cf., seep. 464) 

Species (arranged in order of lowest occurrence) 

1. Bolivina advena var_ ______________ _ 

2. Nonion aff. N. co8tiferum __________ _ 

3. Nonion costiferum _________________ _ 

•· Buliminella curta __________________ _ 

5. Buliminella 8ubfu&iformis _________ _ 

Middle Miocene 

Topanga formation 

Relizian(?) stage 

ml m2 m3 m4 

ElModeno 

volcanics 

Lower 

Luisian 

stage 

m5 m6 

Localities (arranged in approximate stratigraphic order) 

Upper Miocene 

Puente formation 

Lower Mohnian stage 

mi m8 m8a m9 m10 mil m12 m12a I m12b I m12c I ml2d 

Upper 

Mohnian 

stage 

ml4 I' ml6 m17 ---·---·---•---1 I I 

181 

X 

e 

" X 

181 

® • t 

1------------I--------'--------·--------'--------, ________ , ________ , ________ , ___ -----'--------'------ __ , ___ -----, ___ -----'--------' --- ----· --------

e 1-- _.,..,..,..,..,..,..,. ...... , ........................ J.,. .................. .,.J ...... .,. ...... .,. ... .,.J ... .,. ...... .,..,..,..,.J.,..,. .,..,. ............ 1 ...... .,..,. ...... ...... J .................. .,..,.J.,."" """" .,..,. ...... J ... """""" ......................................... .,. ......... .,..,..,.1 ............... ......... (.,..,. ... "".,..,..,. ... I .................. -I • ... """""""" .,..,. 

"""" ............................................... .,. .................. , ............ .,..,. ... .,..,..,..,..,.,.,..,..,..,..,..,..,..,.,.,..,. ... .,..,. ... .,..,.J.,..,. .................. J.,..,..,..,. ... .,. ...... J ... .,. ...................... .,. ............... "" I"""".,..,. ................... """"""""""""'"""""""""""" --1- .................................. ............ 1 ......... """""""" •I- """" .,..,..,. .... I """" """""" ...... I-"" ... .,. ...... .,..,. 

X 

181 

1------------' --------' --------, _______ _ 

0 0 " " " e " " " " " " " X 6. Epistominella? sp ________________ _ " ' 1------------1--------'- _______ , _______ - , ____ ----' -------- '--------'--------' --------·-- ------, ___ -----' ---- ____ , _____ - --' -------· 

i. Suoorunda kleinpelli ______________ ~--------~--------~-------- " " ------------1--------, ________ , ________ , --------' --------' -------- 8. Bolivina tumida ____________________ ________ -------- __ 

9. Bolivina decurtata __________________ -------- ________ --------1 ""-cf. 

10. Bolivinacf. B.subadvena ___________ ________ ----------------

11. Valvulineria depressa _______________ ________ -------- --------

12. Bolivina8inuata var. alisoensis _____ -------- -------- ________ --------

13. Bulimina montereyana ______________ ________________ -------- --------

14. Valvulineria californica var. obesa ____ ________________ -------- _______ _ 

15. Epistominellagyroidinaformis _______ -------- -------- -------- -------- 16. Nonion pizarrensis __________________ ________________ -------- _______ _ 

17. Epistominella relizensis ____________ -------- -------- ________ --------

e 

® 

" ® 

0 

0 

t 

0 18. Bolivinacf. B. vaughani__ ____________ -------- -------- -------- --------1------------1 

19. Bolivinamarginatavar.gracillima ___ -------- ________ -------- _______ _ 

20. Bolivina cf. B. decurtata ____________ -------- -------- -------- -------- ------------1 

21. Bnliminella ecuadorana _____________________ -------- -------- -------- ------------

22. Valvulineria cf. V. orandis ___________ ________________ -------- ________ ------------

23. Gyroidina sp ________________________________________ -------- ________ ------------

24. Bolivina cf. B. salinasensis _________ -------- ________ -------- ________ ------------

25. Bolivina cf. B. subhughesi__ _________ -------- -------- -------- ________ ------------

26. Virgulina californiensis _____________ -------- ________________ --------------------

27. Bulimina uvigerinaformis ___________ ________ -------- -------- -------- ------------

28. Bulimina delrevensis ________________ -------- ________ -------- ________ ------------

29. Bulimina cf. B. pseudoa_ffinis ________ -------- -------- -------- -------- ------------

30. Uvigerina subpereorina _____________________ -------- -------- ________ ------------

31. Globioerina bulloide,, ________________ -------- ________ -------- ________ ------------

32. Eponides rosaformis ____ ------------ -------- ________ -------- ________ ------------

e 

X 

t 

® 

" X 

0 

" " 

" 

t 

0 

" " 

" 0 

" X 

X 

® 

Xcf. 

0 

33. Bolivina californica_ -------- ______ -- _ ------- -------- -------- -------- ------------ --------, _______ " _ 

34. Planulina ornata ___________________ -------- -------- -------- ________ -· 

35. Bolivina obliqua ______ ------ ________ -------- -------- -------- -------- ------------ -------- --------

36. Bolivina girardensis _________________ -------- -------- -------- ________ ------------ -------- --------

3i. Bolivina modeloensis __ ------ ________ -------- -------- -------- -------- ------------ -------- _______ _ 

0 

t 

" 

® 

" X 

t 

e 

" " " " 38. Bolivina pseudospissa ______________ -------- -------- -------- ________ ------------ -------- -------- --------

39. Uvioerinajoaquinensis ____ ---------- -------- -------- -------- -------- ----------- ________________________ _ 

40. Bolivina woodringL _________________ -------- -------- -------- -------- ------------ -------- -------- --------

""-cf. 

X 

181 

" 

" 

""-cf. 

" " 

® 

®cf. 

" 

" () 

41. Nonionella miocenica ______________ -------- ------- _ -------- ________ ----------- _ -------- -------- -------- ________ --------

" 

" " 

" 

® 

• X 

" 

" 

• 

" 

42. Bolivina brevior ______________________________ ------ ______________________________________ ------ _________________________________________ _ 

' 

e 

e 

® 

' 

X 

X 

" 

" 

e 

e 

X 

® 

" 

e 

t 

" 

X 

() 

" 

X 

() 

" 

" " 

" 

" () 

" 

" 

0 

e 

" 

" 

" 

"cf. X 

" 

" 

• 

X 

e 

" 

e 

" t 

• 

X 

" 

• 

® 

" ® 

® 

" 

" 

Xcf. 

43. Bolivina barbarana _________________________________ --- ________________________________________________________________________________________ _ 

44. Cassidulina cushmanL ________________________________________________________________________________________________________________________ _ " " " --------1--------1-------- I-------- 1- ~:-- ----1--------

45. Baooina californica _________________ -- ___ --- ________________ : __________________________________________________________________________________________ _ 

47. Anoulooerina sp ____________________ . ------- -------- -------- -------- ------------ -------- -------- -------- -------- -------- ________ -------- -------- -------- -------- " ' 46. Bolivina interjuncta var. bicostata ___ -------- -------- -------- -------- ------------ -------- -------- -------- -------- -------- -------- -------- ________ --------~--------

48. Hopkinsina magnifica ______ ----·---_ -------- --- _____ ----- ___ ---- ____ -- ____ --- ___ ---- _ --.. -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- --------

49. Gvroidina rotundimargo _____________ -------- -------- -------- -------- ------------ -------- -------- -------- -------- -------- -------- ________ -------- -------- ________ !_ _______ , ________ , ________ , _______ _ " ---·---·---!---1 1---·---·---·----·---·---·---·---·---·---·---·---·---·---·--- Total population (rounded)_ .1130, 000 1270,000 I 8, 400 550 5,100 32,000 94, ooo I 5, 100 I 29, ooo 850 I 1,000 I 17,000 l250,ooo 12so,ooo 1290,000 I 50,ooo 1290,000 1.40,000 I 66,000 I 6,400 

~ 

0 

::l:l 

> 

~ 

z 

~ 

"%j 

t'j 

::l:l 

> 

0 

"%j 

~ 0 

z 

>-j 

M 

::l:l 

M 

~ 

U1 

0:1 

> 

~ 

M 

·~ "'d 

0 

trJ 

z 

1-3 

M 

~ 

0 

~ > 

~ 0 

~z 

0 

> 

~ ~ 

l'%j 

0 

::l:l 

~ > 

t+:o-

~ 

~ 
470 SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY 

SOUTHWESTERN SANTA ANA MOUNTAINS 

The upper Miocene faunas (table 4) of the southwestern Santa Ana Mountains have many anomalous 

features. Collections m18 and m19 contain forms 

characteristic of the Luisian stage, but also some 

forms typical of the Mohnian stage. These two 

s·amples were collected from a small outcrop of 

the Monterey shale isolated by complex faulting from 

the main part of the formation. The stratigraphic 

position of these samples is unknown, but faunally they 

appear to represent the upper part of the Luisian stage. 

Samples m20 through m28 were collected on two 

traverses across the Puente formation (fig. 156). The 

stratigraphic positions of the samples from one of these 

traverses is shown in figure 157. Samples m20 to m28 

are assigned to the lower Mohnian stage because of the 

presence of Valvulineria cf. V. grandis, Epistominella gyroidinajo'f"JnJis, and Baggi.lna californica. Only 

one sample (m26) contains Bulimina uvig·erinaformis. 

AREA EAST OF OSO CREEK 

Two tables of distribution (tables 5 and 6) were 

prepared from samples collected in the area east of 

Oso Creek. Table 5 was prepared from isolated outcrop samples and table 6 from the Shell Oil Co.'s Mission contraflush No. 38 (well 6, fig. 156 and table 1). 

Widely dispersed outcrop samples could not be accurately correlated stratigraphically. The base of th-:-

Monterey shale in this area is not exposed at the surface, as the lower part of the Monterey is faulted out 

TABLE 4.-Distribution of Foraminifera in the Monterey shale and the Puente formation from the southwestern Santa Ana 

Mountains 

[Numbers indicate percent or total population or locality: ·, 1; "' 1-3; t. 4-6; X, 7-10; 0, 11-15; 8, 16-20; ®, 21-30; (), 31-40; e, 41-50; 181, 61-80; •• 81-100; cr., seep. 464) 

Localities (arranged in approximate stratigraphic order) 

Middle Miocene Upper Miocene Species 

(arranged in order of lowest occurrence) 

Luisian(?) stage Lower Mohnlan stage 

m18 m19 m20 m21 m22 m23 m24 m25 m26 m27 m28 

-·-------------------1-----------------------------------------

I. Valrmlineria williamL __________ ____ ----------------

2. Valvulineria californica var. obesa. ··-- _. ____________ _ 3. Valvulineria cf. V. grandis _________________ · ________ _ 

4. Bolivina advena var. striatella _______________________ _ 

5. Bolivina marginata var.gracillima __________________ _ 6. Bolivina decurtata __________________________________ _ 

7. Bolivina obliqua ______ __ • _______ • ___________________ _ 

8. Bolivina tumida ____________________________________ _ 

9. "Uvigerinella" californica var _______________________ _ 

10. Nonion costiferum __________________________________ _ 

11. Virgulina californiensis _____________________________ _ 

12. Buliminella subfusiformis __________________________ _ 

13. Buliminella curta __________________________________ _ 

14. Epistominella relizensis __ ------- _ -------- ___________ _ 15. Planulina ornata ___________________________________ _ 

16. Cassidulina limbata ________________________________ _ 

17. Cassidulina cf. C. margareta ________________________ _ 

18. Globigerina bulloides ______________________ _ ----------

19. Bolivina interjuncta var. bicoatata ___________________ _ 

20. Suggrunda kleinpelli__ __________ ------------------- _ 

21. Cibicides sp _______ ---------------------------------- 22. Bolivina cf. B. woodringi__ _________________________ _ 

" " " t 

t 

0 

" ® 

" t 

t 

e 

t 

" " " " " X 

23. Uvigerina subperegrina______________________________ " 

24. Gyroidina rotundimargo_____________________________ " 

25. Bolivina barbarana __________________________________ ----------

26. Baggina californica ______ _____________________________________ _ 

" t 

X 

" 

27. Bolivina sinuata var. alisoensis ______________________ ---------- ----------

® 

• 

0 

28. Epistominella gyroidinaformis ___________ ~----------- ---------- ---------- ---------- 29. Epistominella pacifica _______________________________ -------------------- t 30. Cibicides illingi______________________________________ __________ __________ " 

31. Bolivina rankinL------------ 7 ---------------------- ---------- ---------- " 

• 

" t 

X 

X 

X 

• X 

0 

0 

ecr. " 

() 

X 

() 

® 

"ct. ----------

32. "Uvigerinella" californica ____________________________ ---------- ---------- ---------- " ---------- ---------- ---------- ---------- ---------- ---------- ----------

33. Buliminella eC1tadorana _____________________________ ---------- ---------- ---------- ® X 181 II ---------- ---------- ---------- 34. Bolivina cf. B. decurtata _____________________________ __________ ---------- ---------- ---------- t ---------- ---------- ---------- ---------- ---------- ---------- :35. Epistominella subperuviana _________________________ ---------- ---------- ---------- ---------- " " ---------- ---------- 3u. Uvigerina joaq1tinensis _________ ______________________________________________________________ ---------- " " -------- ________ ---- ----------

37. Bolivina cf: B. vaughani_ ____________________________ __________ ---------- ---------- ---------- ---------- ---------- ---------- " e X 

38. Bulimina uvigerinaformis ____ _________________________________ -- ____________ -- ______________ ---------- ---------- ---- _ -- _ -- ---------- ---------- ----------

39. Angulogerina? sp _________________________________________ --- _ ---------- ---------- ---------- ---------- ---------- ---------- ---------- " ---------- ····------

40. Robulus smileyi_ ____________________________________ ---------- ---------- ---------- __________ ---------- ---------- ---------- ---------- () 

41. Bolivina pseudospissa _______________________________ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- X 

Total population (rounded)___________________ 31,000 51,000 51,000 19, 000 130, 000 20,000 8,800 2, 800 42,000 510 28 
33° 

33°37' 

33°32' 

FORAMINIFERA OF MONTEREY SHALE AND PUENTE FORMATION, CALIFORNIA 

EL TORO AIR STATION 

NAVAL RESERVATION 

e875 

/ ,~'f-;' .Ct~: 

/ 

/ 

:--· 

( 

,-/ 

e610 

/. 

I 

( 

/ 

~-

.651 / 

EXPLANATION 

D Post-Monterey and post-La Vida rocks 

~ 

i 

) 

~i ~: 

I 

) 

e .. / ~( ~~ ·, 

"'! 

,r 

I Monterey shale and La Vida member of Puente formation . i ~! ) Pre-Monterey and pre-Puente rocks 

Contact, approximately located; dotted where concealed 

Fault. approximately located; dotted where concealed 

. Elevation. in feet 

~ Core hole (table I) 

x633 

Foraminifera locality 

!Mile 

c~ f( 

( $(·' 

\ 

: / 

(_· 

\ 

( SAN JUAN CAF'ISTRA~IO 

\ 30'00"' 

., 

i 

.I!'IGUitE 156.-Mai> of the l\·lonterey shale and Puente formation in the ·san Juan Capistrano area and structure section across the Capistrano syncline. 

471 
472 SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY 

by the Cristianitos fault. Two samples (m29 and m30) 

from the Monterey shale· east of the Cristianitos fault 

contain good Luisian faunas ( Valvulineria californica 

and N onion costiferum). All the outcrop samples from 

west of the fault contain Mohnian faunas, probably 

lower Mohnian (Baggina californica, Eponides rosafo'f"l711is, Valvulineria cf. V. grandis, and Epistominella 

gyroid{nafm·mis) . 

The Shell Oil Co.'s Mission contraflush No. 38 (well 

6) spudded in siltstone that is stratigraphically near 

the middle of the Monterey shale and bottomed in sandstone of the Topanga formation at a depth of 766 feet. 

Samples of Monterey shale from 633 feet to 543 feet 

contain a good upper Luisian Siphogenerina collomi 

zone fauna, including S. collomi, V alvulineria miocenica, V. californica and N onion costiferum. From 

543 feet to 103 feet, where coring began, the faunas are 

Mohnian in age. The presence of Epistominella 

gyroidinaformis and Eponides rosaformis from 543 to 

243 feet indicates that this part of the section belongs 

to the lower Mohnian. Outcrop samples m34 to m38 

(table 5) are all higher stratigraphically than the 

uppermost samples from contra.flush No. 38. 

Data from contraflush No. 38 indicate a thickness of 

about 90 feet for rocks of Luisian age, and about 543 

feet for rocks of Mohnian age. Data from a structure 

section from the core hole westward to the contact between the Monterey shale and the Capistrano formaTABLE 5.-Distribution of Foraminifera in Monterey shale from the area east of Oso Creek 

[Numbers indicate percent of total population of locality: ·, <1; "-._, 1-3; t, 4-{i; X, 7-10; 0, 11-15; 8, 16-20; ®, 21-30; (), 31-40; e, 41-60; 181, 61-80; •• 8o-100; cf., ·seep. 464.) 

Species (arranged in order of lowest occurrence) 

Middle Miocene 

Upper Luisian 

Stage 

m29' m30 m31 

Localities (arranged in approximate stratigraphic order) 

Upper Miocene 

Lower Mohnian Stage 

m32 m33 m34 m35 m36 m37 m38 m39 

----------------------------------------------------

1. Bulimina monteregana______________________________ e ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- 2. Nonion costiferum__________________________________ () ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------

3. Nonionella miocenica. ______________ --- _ -- _ ------ ___ X ---------- -_-- ------ ---------- ---------- ---------- ---------- ---------- -- ___ ----- ___________________ _ 

4. Buliminella subfusiformis___________________________ t X "-._ ® X () "-._ 

5. Epistominella ggroidinaformis_______________________ X e ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- 6. Bulimina carnerosensis ___________________________ -- - __ ------- "-._ __ ----- __ - _ -- _- __ --- -_- ___ ---- ---------- _ -- ____ --- _______________________________________ _ 

7. Buliminella curta ___________________________________ ---------- 0 0 "-._ X 0 0 8 

8. Cibicides illingL ____________________________________ ---------- t ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- 9. Uvigerina joaquinensis ______________________ -.- _______ --- _ -- _ -- X ________ - _ ---------- - _- _ ------ - __ ------- _ -- _ --- ____ -- __ -- _ -- _____________________________ _ 

10. "Uvigerinella" californica var ________________________ ---------- "-._ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- 11. Valvulineria californica. ____________________________ ---------- t ---------- ---------- ---------- ---------- ------- _-- -_-- -- _- _______________________________ _ 

12. Bolivina sinuata var. alisoensis ______ --------------- ___ ·________ "-._ "-._ ---------- ---------- ---------- ---------- ____________________ ---------- ---------- 13. Bolivina tumida ____________________________________ ---------- "-._ ____ ------ ------ __ -- ---------- ---------- --- __ -- __________________________________________ _ 

14. Bolivina marginata var. gracillima ___________________ ---------- "-._ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- 15. Virgulina californiensis _______________ --- ____ -- ___ -- ---------- ---------- ---------- ---------- -_ _ __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ _ _ _ __ _ _ _ _ _ _ _ () 

16. Epistominella subperuviana _________________________ ---------- "-._ ---------- ---------- ---------- ---------- __________ ---------- "-._ ---------- ----------

17. Bolivina californica _________________________________ ---------- ---------- ---------- ---------- ---------- ---------- __________ ---------- ---------- ---------- 18. Bolivina rankini__ __________________________________ ---------- ---------- e e ® t 0 "-._ t ® 

19. Suggrunda kleinpelli__ __________________ c ___________ ---------- ---------- X X "-._ "-._ "-._ tcf. 

20. Bolivina cf. B. decurtata. _ -------------------------- ---------- ---------- "-._ ---------- ---------- ---------- ---------- ---------- ---------- ---------- _________ _ 21. Epistominella relizensis _____________________________ ---------- ---------- t "-._ X ® 8 

22. Buliminella elegantissima ___________________________ --------~- ---------- "-._ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------

23. Bolivina interjuncta var_ bicostata __ ---------------- _ ---------- ---------- "-._ ---------- ---------- ---------- ---------- --------- _ ---------- ---------- ---------- 24. Globigerina bulloides ________________________________ ---------- ---------- "-._ "-._ 0 ---------- ____________________ ----------

25. Cassidulina cush7nanL _______________________________ -- _ ------ ---------- "-._ ---------- ---------- ---------- ---------- ------- __ - -_- ______________ -- __ -- __ -- __ _ 

26. Bulimina (Desinobulimina) SP---------------------- ---------- ---------- "-._ ---------- ---------- ---------- ---------- ---------- ____________________ ---------- 27. Bulimina cL B. pseudoaffinis _______________________ ---------- ---------- "-._ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------

28. Bulimina uvigerinaformis ___________________________ ---------- ---------- "-._ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- 29. Eponides rosaformis ______________________________________________ --- _ _ _ "-._ ----- _____ -_- _ -- __ -- _ -- _-- __________ -- _________________________________________ _ 

30. Bulimina ovula _____________________________________ ---------- ---------- "-._ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- 31. Bolivina decurtata __________________________________ ---------· ---------- "-._ "-._ "-._ e "-._ e () e X 

32. Bolivina pseudospissa _______________________________ ---------- ---------- "-._ "-._ "' "-._ ---------- ---------- ---------- X 

33. Bolivina cf. B. vaughani__ ___________________________ ---------- ---------- ---------- 8 e X X t () ® 

34. Uvigerina subperegrina ______________________________ ---------- ---------- ---------- "-._ ---------- ---------- ---------- "-._ ---------- ----------

35. Baggina californica. ___ -----------------------------. ---------- ---------- ---------- t ---------- ---------- --- ·------ "-._ ---------- -------- __ 36. Valvulineria cL V. grandis __________________________ ---------- ---------- ---------- ---------- ---------- t ---------- ---------- ---------- "-._ 

37. Ggroidina rotundimargo·---------------------------- ---------- ---------- ---------- ---------- ---------- t ---------- ---------- "-._ "-._ 

38. Uvigerina hootsi_ ____________________________________ ---------- ---------- ---------- ---------- ---------- "-._ "-._ ---------- ---------- ----------

39. Bolivina woodringi_ _________________________________ ---------- ---------- ---------- ---------- ---------- ---------- 8 tcf. tcf. ---------- ----------

40. Planulina ornata ______________ , _____________________ ------------------------------------------------------------ ---------- ---------- ---------- ----------

41. Bolivina cf. B. seminuda _______ ·,: ____________________ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------

42. BoU'i: ~:~:~~~;;~~-;~~~~~;:::::::::::::::::: =~~~~~~ ~,;~~~==;; 

t Limy sample, not washed, abundances estimated. 
FORAMINIFERA OF MONTEREY SHALE AND PUENTE FORMATION, CALIFORNIA 473 

tion show an additional thickness of approximately 600 

feet, giving a total thickness of about 1,200 feet of 

Monterey shale assigned to the lower Mohnian stage. 

In this area, the overlying Capistrano formation contains Mohnian Foraminifera in its basal part, and 

Pliocene Foraminifera in its upper part. 

AREA WEST OF OSO CREEK 

The Monterey shale exposed west of Oso Creek consists of diatomaceous shale and siltstone, locally sharply 

folded, and containing abundant Foraminifera. 

The check list (table 7) lists samples from Shell Oil 

Co.'s Moulton core hole No. 14 (well 2, table 1), which 

was spudded in the Capistrano formation. The samples 

are composite samples of 20-foot intervals. 

The interval from 750 to 730 feet is probably assignable to the Siphogenerina reedi zone, as it contains 

V alvulineria depressa. From 730 to about 410 feet are 

faunas of the Siphogenerina coll01ni zone. The upper 

limit of this zone is poorly defined. The highest occurrence of S. collomi, H emicristellaria beali and 

other Luisian forms is at 550 feet. However, Valvulineria californica var. obesa and V. miocenica 

are present up to 410 feet. From 410 to 210 feet 

(the topmost core sample) Episto'TI11inella gyroidinaformis and abundant Eponides rosaformis indicate 

the Bulimina uvigerinaformis zone. 

This core hole is the only one in the area which 

penetrated a complete section of the Monterey shale. 

The lower Luisian is about 20 feet thick, the upper 

Luisian is about 320 feet thick, and the lower Mohnian 

is about 200 feet thick. 

Table 8 is based on samples taken along a traverse 

across the Monterey shale, plus a few isolated samples 

(fig. 156). Locality m56 is in an isolated outcrop of 

the Monterey shale; its stratigraphic position is unknown. The Monterey shale exposed here is strongly 

folded, and samples were arranged as nearly as posTARLE 6.-Distribution of Foraminifera in llfontereu shale from Shell Oil Co.'s Mission contrajlush· No. 38 

[Numbers indicate percent of total population of sample: ·, <I;"' 1-3; t, 4-6; X, 7-10; 0, 11-15; 8, 1&-20; ®, 21-30; (), 31-40; •• 41-6Q; 181: 61-80; •• 81-100, cf., seep. 464] 

Species (arranged in order of lowest 

occurrence) 

Middle Miocene 

Upper(?) Luisian stage 

'103-633 573-603 543-573 

--------------1 -----------

Core samples (depth interval in feet) 

Upper Miocene 

Lower(?) Mobnian stage 

13-543 483-513 453-483 333-363 303-333 243-273 193-233 163-193 103-113 

1. Siphogenerina collomi.. -------------- ___ X ---------- --------- ..••• ____ ---------- ---------- _ --------- ---------- ---------- ---------- ---------- _________ _ 

2. Bolvina advena var. striatella........... 8 ® 0 --------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- 3. Valvulineria miocenica__________________ X () 0 --------- ---------- .. _________ ---------- ---------- ---------- ---------- ---------- ---------- 4. Valvulineria californica__________________ ® ---------- --------- --------- ---------- ---------- ---------- ---------- ____________________ ---------- ----------

5. Valvulineria californica var. obesa_______ 0 " ® --------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------

6. Buliminella curta·---------------------- X 8 X ---------- ---------- ---------- X ® " ® 

7, Uvigerina subperegrina__________________ X " --------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------

8. Nonion costiferum________________________ X " X --------- ---------- ---------- __________ ---------- __________ ---------- ---------- __ 

9. Hemicristellaria beali_____________________ " " " _________ ---------- __________ ---------- ---------- ---------- __________ ---------- __ _ 

10. "Uvigerinella" californica________________ 0 8 --------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- 11. Baggina californica_______________________ " " ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------

12. Cassid1dina cf. C. panzana_______________ " ---------- ---------- ---------- ---------- __________ x x ® 

13. Bolivina sinuala var. alisoensis ___________ ---------- ---------- " " X () ® " __________ ----------

14. Robulus miocenicus .. -----------------~-- ---------- ---------- " ---------- ---------- ---------- ---------- ---------- ---------- ____________________ ----------

15. Robulus smilevL------------------------- ---------- ---------- " ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------

16. Dentalina obliqua ________________________ ---------- ---------- " ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------

17. B1tliminella equadorana __________________ ---------- ---------- X ---------- ---------- ---------- 0 ---------- ---------- ---------- ---------- ---------- 18. Epistominell!! subperuviana ______________ ---------- ---------- " ---------- ---------- ---------- ____________________ ---------- ---------- ---------- ----------

19. Nonion cf. N. costiferum _________________ ---------- ---------- ---------- 181 () ---------- __________ ---------- ---------- ---------- ---------- ----------

20. R1Jistominella gyroidinaformis ____________ ---------- ---------- __________ " e X " __________ ---------- ---------- ---------- ----------

21. Uvigerina hootsi__ ________________________ ---------- ---------- ---------- X t X ® e ® ® cf. t 

22. Bolivina pseudospissa. ------------------- ---------- ---------- ---------- ---------- t " " ® () e 23. Valvulineria ara1tcana ____________________ ---------- ---------- ---------- ---------- X 181 X ---------- __________ " __________ ----------

24. Valvulineria cf. V. miocenica _____________ ---------- ---------- ---------- ---------- ---------- X " ---------- ---------- ---------- ---------- ----------

25. E1Jistominella pacifica ____________________ ---------- ---------- ---------- ---------- ---------- ---------- 8 ---------- ---------- ---------- ---------- ---------- 26. Bolivina rankini_ _________________________ ---------- ---------- ---------- ._ __________________ ---------- ---------- " ---------- ---------- ---------- ----------

27. Epistominellu relizeusis __________________ ---------- ---------- ---------- ---------- ---------- ________ !_ ---------- t 0 " 

28. Bolivina cf. B. vaughani_ _________________ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- " X 0 e 

29. Eponides rosaformis ______________________ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- " ---------- ---------- ---------- 30. Globigerina bulloides _____________________ __________ ---------- ---------- ---------- __________ ---------- ---------- __________ 0 X 

31. Gvroidina rotundimargo. ----------------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- t " 

32. Bolivina interjuncta var. bicostata _________ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- " ---------- ---------- 33. Cibicides illing! __________________________ ---------- ---------- __________ ---------- ---------- ---------- ---------- ---------- ---------- t " 34. Planulina ornata _________________________ ______ . ______________ . ____________________________ ---------. __ ------- _ ---------- ---------- " " 

35. Suggrunda kleinpelli_ ____________________ ---------- ---------- __________ ---------- ---------- ---------- ---------- ---------- __________ " ---------- ----------

Total population (rounded)_ •. _. __ 420 9,300 2,800 14 21 29 480 250 73 71 13 
TABLE 1.-Distribution of Foraminifera in Monterey shale from Shell Oil Co.'s Moulton core hole No. 11, 

[Numbers indicate percent of total population of sample: ·,<I;"'-., 1-3; t, 4-6; X, 7-10; 0, 11-15; 8, 16-20; ffi, 21-30; (), 31-40; e, 41-flO: 181, 61-80: •• 81-100, cf., seep. 464) 

Core samples (intervals in feet) 

Middle Miocene Upper Miocene 

Species (arranged in order of lowest occurrence) 

.,;_- ... 

Lower(?) 

Luisian 

stage 

Upper Luisian stage Lower(?) Mohnian stage 

73(}-750 I 71(}-730 I 63(}-650 I 57(}-590 I 55(}-570 I 51(}-530 I 49(}-510 I 47(}-490 I 45(}-470 I 43(}-450 I 41(}-430 139(}-410 I 37(}-390 I 35(}-370 I 33(}-350 I 27(}-290 I 25(}-270 I 23(}-250 , ____ , ___ , ___ , ___ , ___ , ___ , ___ , ___ , ___ , ____ , ___ , ___ , ___ , ___ , ___ , ___ , ___ , __ _ 

I. Bolivina advena var _ ----------------------------------- X 2. Valvulineria depressa___________________________________ "'-. 

3. Cassidulina cf. C. panzana_____________________________ "'-. 

4. Bolivina advena var. striatella___________________________ 0 

5. Bolivina cr. B. pseudospissa____________________________ X 

6. Ruliminella wrta_ _ _ __ _ _ _ __ _ _ __ _ _ _ _ _ _ _ _ __ _ _ __ ____ _ _ _ _ _ _ e 7. Epistominella relizensis_ ------------------------------- X 8. Globigerina bulloides_:__________________________________ X 

9. Buliminella subfusiformis __________ ______ --------------

10. Valvulineria californica var. obesa ______________________ ----------

11. Uvigerina sub peregrina _________________________________ _________ _ 

e 

0 

"' t 

X 

"' ---~ --~---~---1 

• ffi 

X 

t 

I 

t 

0 ffi 

Ef) e 

"' 

t 

0 "' 

X I () ffi ffi 181 

"' 181 

0 

Ef) 

() 

"' 

:---1 ! 

0 

X 

t 

e 

t 

e 

0 I X 0 X 

"' 

X 

X 

0 "' 12. Valvulineria miocenica _________________________________ ---------- X X t t 0 t X -------- -------- -------- -------- -------- -------- --------~--------~--------

13. Nonion costiferum ______________________________________ ---------- "'-. "'-. ________ -------- -------- -------- . -------- ~------- -------- -------- -------- -------- -------- --------

!!: ~~::::~i: c~i:c~~;::!:~~-;l~b~-l~~~ ~ ~ ~ ~~ ~ ~ ~ ~ ~ ~~ ~ ~ ~~ ~ ~ ~ ~ ~ ~~ ~~~ ~ ~ ~ ~ ~~ ~ ~ ~ ~ ~~~ ~~ ~ ----;--- t ---~--- -- -~ --- ~ ~~ ~ ~~~ ~ ~ ~ ~ ~·~~ ~ ~ ~ ~~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~~ ~ ~ ~ --- ~- -- ~ ~ ~ ~ ~ ~ ~ ~ ---~--- ---~--- --- ~--- ---~--- 16. Gyroidina rotundimargo_ ------------------------------- __________ -------- "'-. "'-. ________ ________ ________ "'-.? ________ "'-. t ________ ________ "'-. 17. Baggina californica____ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ _ ___ _ ___ _ _ _ _ _ _ _ _ _ _ _ _ _ ___ _ _ _ _ _ _ _ __ _ _ _ ___ __ __ _ ___________________________________________________ ---- "'-. -------- --------

18. Dentalina obliqua ______________________________________ __________ -------- -------- • --------· -------- ________ -------- ________________________________________ -------- -------- -------- -------- 19. Hemicristellaria beali ___ ! __ _ _ _ _ __ _ _ _ _ _ _ __ _ _ _ __ __ __ _ _ _ _ _ _ _ _ __ ___ _ _ _ _ __ _ __ _ _ _ _ __ _ __ _ _ ______________________________________________________________________________________________________________ _ 

20. Robulus smileyL _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ _ _ __ _ _ _ _ _ _ _ _ _ ____ _ _ _ __ _ _ _ ___ __ _ __ _ _ _ _ __ __ _ ___ ____ _ ______________________________________________________________________________________________________________ _ 

21. Siphogenerina collomL _ _ __ _ _ _ _ _ _ _ _ _ _ _ __ _ _ _ _ _ _ _ _ __ _ _ _ _ _ _ _ _ __ _ ___ __ _ _ _ _ ___ _ ____ _ ___ _ ______________________________________________________________________________________________________ _ 

22. Epistominella subperuviana _____ ----------------------- ---------- -------- -------- -------- t ________________ -------- __________________ ------ -------- -------- -------- -------- -------- -------- -------- 23. Eponides rosaformis___ _ _ _ __ _ _ _ _ _ _ ___ _ _ _ _ _ _ _ _ _ _ _ __ _ _ _ __ _ _ __ ______ _ _ _ _ ___ __ _ _____ __ _ _ _ _ _ __ _ "'-. _______________________________ ~ _ _ _ _ _ _ _ _ _ _ _ _ __ _ _ X t t ____________________________ --- _ 

24. Bolivina rankini_ _______________________________________ ---------- -------- -------- -------- -------- t "'-. X X 0 ________ ffi ffi ffi -------- ________ -------- --------

25. Bolivina marginata var. gracillima ______________________ ---------- -------- ________________________ -------- "'-. "'-. ________________________________________ -------- ________ -------- -------- -------- 26. Virgulina californiensis_________________________________ __ ______ __ _ _ _ ___ _ _ ___ _ _ _ __ _ __ _ __ _ _ _ _ _ _ _ ___ ___ _ ____ "'-. X t "'-. _ _ _ _ __ _ _ _ _ __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ t _______________________ _ 

27. Suggrunda kleinpellL ---------------------------------- __________________ -------- -------- -------- ________ -------- ________ ________ X -------- ________________________ -------- ________ "'-. "'-. 28. Bolivina tumida __ __________________________________________________________________________________________________________________ ._ _ _ _ _ _ 0 _ _ _ _ __ _ _ _ _ _ _ ___ _ _ _ _ _ _ _ _ _ __ _ _ _ __ _ _ ______________ _ 

29. "Uviqerinella" californica_ ----------------------------- ---------- -------- ________ -------- -------- -------- -------- -------- -------- -------- "'-. -------- -------- -------- -------- -------- -------- -------- 30. Bolivina decurtata ______________________________________ ---------- -------- -------- -------- -------- -------- -------- -------- -------- -------- ________ t X ________ 0 () 8 () 31. Uvigerina hootsL _______________________________________ ---------- -------- -------- -------- -------- ________ -------- ________________ -------- -------- X t 8 X -------- -------- --------

32. Epistominella qyroidinaformis _ ------------------------- ---------- -------- ________ -------- ________________ -------- ________ -------- ________ ________ t ________________________ -------- -------- -------- 33. Bolivina sinztata var. alisoensis_ _ __ ___ _ _ _ ___ _ _ _ _ _ _ _ __ _ __ ___ _ _ _ ___ _ _ _ __ _ _ _ _ _ _ __ _ _ _ _ _ _ _ _ _ ___ ___ _ _ _ _ _ _ _ ___ _ _ _ _ __ _ __ __ ___ __ _ _ _ __ ___ _ _ _ _ __ _ _ __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ _ t _______________________________________ _ 34. Bulimina carnerosensis____ _ _ _ _ _ _ _ ___ _ _ _ __ __ _ _ _ ___ _ __ __ _ _ __ _ _ _ _ __ _ _ _ _ ___ _ _ _ _ __ _ __ _ _ _ ___ ___ ___ _ _ _ _ _ _ _ __ _ _ _ _ _ __ _ __ __ __ _ ___ _ _ __ ___ _ _ _ ___ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ _ t ______________________________________ --

3.'i. Buliminella ecuadorana ________________________________ ---------- -------- ____ · ____ -------- -------- -------- -------- -------- ________ -------- ________ -------- 0 8 -------- -------- -------- -------- 36. Cassidulina cnshmanL _ _ __ _ _ __ __ _ __ _ _ __ _ _ _ _ ____ ___ _ _ _ _ _ __ _ _ ____ _ _ _ ____ __ _ _ __ _ ___ _ _ _ ___ ___ ____ _ _ __ __ ___ _ _ _ __ _ __ _ __ __ _ __ _ _ _ _ _ ___ _ _ _ ___ _ _ _ _ _ _ _ _ _ _ _ _ _ __ __ _ _ __ _ _ _ _ _ _ _ _ __ _ _ __ _ _ _ ___________ -_--

37. Bulimina ovnla_ _ _ ___ _ _ _ _ _ _ _ _ _ __ _ _ _ ______ _ ____ _ _ _ _ _ _ _ _ _ ___ _ __ _ _ _ _ _ _ ___ ___ _ ___ __ __ _ _ _ _ _ __ _ ___ _ ____ _ _ _ _ __ __ ___ ___ __ __ _ __ _ _ _ __ ___ _ _ _ _ _ _ _ _ _ __ __ _ _ _ _ _ _ _ _ _ _ _ _ __ __ _ _ _ _ _ _ "'-. -------- -------- -------- --------

38. Bolivina woodringL ________________ ------- _____________________________________________________________________________________________________ -____________ -- _- _ - _____ -_ -------- "'-. -------- -------- 39. Epistominella thalmanni. _ _ _ _ __ _ __ _ _ _ ___ ____ _ _ __ _ _ __ _ __ ___ _ _ _ __ __ _ _ __ __ __ ___ __ _ _ _ ____ _ ___ ___ _ ____ __ _ _ ____ __ _____ _ __ _ _ ___ _ _ _ ___ _ _ _ _ _ _ _ _ _ _ _ __ ___ _ _ _ _ ___ _ __ _ ___ _ _ _ _ _ _ _ _ _ __ _ _ __ _ ___ _ _ t 40. Bolivina cr. R. pisciformis. _ _ __ _ _ _ __ _ _ _ ___ _ _ ___ ___ _ _ ____ _ _ _ _ ____ __ _ _ ___ _ _ _ _ _____ _ _ _ ____ _ __ _ ___ _ __ _ ___ _ ___ _ __ _____ _ _ _ _ _ ___ _ _ _ _____ _ __ _ __ __ _ _ ____ _ _ _ _ _ __ _ ___ ___ _ _ _ _ _ _ _ _ _ _ __ _ _ _ _ ___ _ _ _ _ _ __ _ _ _ 0 

41. Bolivina brevior _ --------------------------------------- ---------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- "'-. 42. Angulogerina? sp ________________________________________________________ -------- ___ • _ --- __________ ------ ---- _ -- _ -------- -------- -------- -------- -------- -------- -------- -------- -------- "'-. 

Total population (rounded)_-------------------- 29 390 I 7,400 I 6,ooo I 37,000 II4,ooo 116,000 l18,ooo I 6,200 112o,ooo 880 I 1, 800 I 1, 800 I 4, ooo 26 I 15,000 I 17,000 9,600 

~ 

""'· ~ 

~ 0 

~ t>:1 

~ 

(i 

0 

z 

"-3 

::tl 

~ 

t:D 

~ 

"-3 

~ 

0 

z 

U1 

"-3 

0 

0 

t>:1 

z 

t>:1 

~ ~ 

0 

t>:1 

0 

~ 

0 

0 

to<l 
C. 'I 

0 

0 

00 

C) 

0 

0 

I 

C) 

r 

"' 

TABLE B.-Distribution of Foraminifera in Monterey shale from the area west of Oso Greek 

[Numbers indicate percent of total population of locality: ·, <I;'\._, 1-3; t, 4-6; X, i-10; 0, 11-15; 8, 16--20; ~. 21-30; (), 31-40; e, 41--oo; 12!:1, 61-80; •• 80--100, cf., seep. 464) 

Species (arranged in order of lowest occurrence) 

Lower Luisian stage 

m40 m41 m561 m42 m43 

Localities (arranged in approximate stratigraphic order) 

Middle Miocene 

Upper Luisian stage 

m44 m45 m46 m47 m48 m49 m50 m51 m52 m5.3 m54 

Upper 

Miocene 

Mohnian 

stage 

m55 

------------------------1 l---l---l---l---l---l---l---l---l---l---l---l---l---1---l---l----

1. Cassidulina williamL ________________________________________ _ " X 

--------'--------·--------' --------·--------' --------'--------, __ ------' --------'--------'--------'--------,_-------'--------'--------1------------ 2. Valvulineria depressa ________________________________________ _ 

3. Robulus smileyi_ ____ ___________________________ -------- ______ _ 

4. Bulimina ovula __ _______ ----- _ --- _____ ------------------------1 5. Nonionella miocenica ________________________________________ _ 

6. Valvulineria calijornica __ ------------------------------------- 7. Virgulina californiensis ______________________ ---_--------------

8. Bolivina advena var. striatella _________________________________ _ 

9. Nonion costijemm __ ------------- ___ --------------------------- 10. Snggmnda kleinpelli_ ________ _______________________________ --

11. Pnllenia miocenica ____ ---------------------------------------

12. Epistominella relizensis_ --------- __________________ -----------

13. Bolivina 14. Globigerina bulloides ________________________________________ --

" " X 

" • X 

" " " t 

" 0 15. Valvulineria calijornica var. obesa _____________________________ --------

16. Bolivina calijornica _____________________________ -------------- --------

17. Bolivina marginata var. oracillima ____________________________ --------

18. Buliminella subjusijormis __________ ---------'------------------ -------- 19. Bolivina salinasensis ________________________________________ -_ ---- ___ _ 

20. Hemicristellaria beali ____ ----------------------------------·-

" 

X 

" 

X 

t 

" () 

t 

0 

X 

E gf:~~~i;:~~-: ~: ~ :::: ~:::: ~ :~ ~ ~: ~ ~- ~ ~ ~~ ~: :~~::~:~:~I~:~~~~. _______ _ 

" " " " " 

" 

" 

" () 

X 

e 

t 

" " 25. Bolivina imbricata __________________________________________ -- ------- _ --- _ ---- '\._ 

26. Buliminella curta ___________________________________________ -- --- _- ___ --- _ _ ___ X 

27. Bulimina montereyana ___ ___________________________________ -- ___ ___ __ _ ___ _ ___ '\._ 

28. Uvigerina subperegrina ____ __________________________________ -- -------- --- _ _ __ _ '\._ 

29. "Uvigerinella" calijornica var. ________________________________ -------- -------- '\._ 

" " () 

" t 

" ® 

X 

" 

X 

t 

" 

" 

12!:1 

" 

" " 

" e 

" 

X 

" ® 

t 

" 

X 

X 

® 

" X 

e 

" 

X 

0 

X 

" X 

X 

·'\._ 

t 

e 

" 

" 

" ® 

e 

" " t 

" 

X 

" 

" 0 

" t 

" 

X 

0 

t 

" " 

" ® 

0 

X 

X 

t 

" 

X 

t 

" " 

181 

" " 

" 

t 

" e 

" 

t 

t 

" ® 

X 

" " 

" " 

Xcf. 

--------' --------'--------'--------'------" --1------------

t 

e 

e 

0 

t 

() 

" 

() 

0 

t 

0 

e 

" " 

X 

e 

" 

X 

e 

0 

X 

e 

--------' --------1------------

X 

t 

" " 

" 

" e 

t 

e 

" 

" " 

0 

0 

® 

" 

" " " 

" " 

" " " X 

" " 

1

--

-· 

0 

" t 

X 

t 

-------- '--------'--------'-------- '--------'-------- '--------1------------

X 0 " 0 

" --------'--------' --------1------------

--------'--------'--------'--------'--------' --------' -------- '--------'-------- '--------'-------- " '-------- '--------1------------ " " 30. Bolivina sinuata var. alisoensis _____ _ --- _ ---------------------- -------- -------- '\._ 1--------1--------1--------1--------1--------I------ --1--------1--------I--------1--------I--------1--------1--------1------------

" " " X " 31. Bolivina cf. B. ---- ____ , --------· --------1------------ rhomboidalis _________________________________ --~- _ --- _ --~-- ___ ---~- ______ _ 

:~: ~!~:~til a~:g!~-c~~~-a----~~~ ~ ~ ~ ~ ~ ~ ~ ~~ ~ ~ ~ ~~~ ~~ ~ ~ ~~ ~~ ~~~~ ~ ~ ~~~ ~~~~ ~ ~~ ~~ ~~ ~ ~~~ ~~~~ ~~~ ~ ~~~ ~ ~~~ ~ 1 ~~ ~~~ ~~ ~ " " " --------'--------'--------'--------'--------'--------'--------'--------'--------1------------ --------'--------'-------- '--------' -------- '--------'--------' -------- '--------'--------' --------1------------

" X 

35. Pullenia miocenica var. globula ____ --------------------------- ________ -------- -------- ________ -------- -------- -------- '\._ X " " 34. Gyroidina rotnndimargo ______ ______ ---------------------------~--------~--------~---- ----~--------~--------~--------~ '\._ I "-

36. Bolivina subadvena ___________________________________________________________________________________________________________ _ " --------'--------'--------'--------'--------'--------' --------1------------

--------' --------I------------

:~: ~~~::;~,::~~~:i:~;i~~ ~ ~~ ~ ~ ~ ~~ ~ ~ ~ ~~~~ ~ ~ ~~~ ~~ ~ ~~~: ~ ~~ ~~~~ ~ ~ ~~~~~~~~~~~I~~~~~~~~ I~~~~~~~~ I~~~~:~~~ I~~~~~~~~ I~~~~~~~~~~~~~~~~~ I:~~~~~~~ I~~~~~~~~ 1----.----I z I I 1--------I--------1--------1--------I------------ 39. Robulns aff. R. simplex _______________________________________ , ________ , ________ , ________ , ________ , ________ , ________ , ________ , ________ , ________ , ________ , ________ , _______ _ " --------'--------'--------I------------

!~: ~:l::::~~~i~~~~~~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~~~~~~~I~~~~~::~ I~~~::::: I::~~:~:~ I:~~::::: I~::~:::: I:::~:~~: I~~~:::~~ I~~~~~~~~ I~~~~~~~~ I~~~~~~~~ I~~~~~~~~ I~~~~~~~~ I ___ ~ __ _ 

--------' --------' --------1------------

" " 42. Epistominella subpenwiana_ _ _ _ _ _ __ __ _ _ _ ___ _ _ ___ ________ ___ _ __ ___ _ _ __ _ _ _ _ _ _ __ _ ___ _ ___ _ _ _ _ _ ___ _ _ ___ ___ _ _ _ _ _ _ _ __ _ _ _____ _ _ _ _ _ ___ _ _ _ _ _ ___ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ _ __ _ _ __ _ __ _ _ "-

43. Bolivina cf. B. vaughani____ _ _ _ _ _ _ _ ___ _ _ _ _ ___ __ __ _ _ _ _ _ _ _ __ _ _ _ __ _ __ _ _ __ _ _ ___ _ _ _ _ ___ _ ___ _ _ _ _ ____ _ _ ____ _ _ _ _ _ _ _ ____ _ __ _ _ _ _ _ _ __ _ ___ _ _ __ _ _ _ _ _ ___ _ _ _ _ _ _ _ _ ___ _ _ _ __ _ _ _ __ _ _ __ _ _ _ _ _ _ _ _ _ ___ "-

::: :~:~:2~::~::s~~;~;;;::::::::::::::::::::::::::::::::::: :::::::: :::::::: :::::::: :::::::: :::::::: :::;:::: :::::::: :::::::: :::::::: :::::::: :::::::: :::::::: :::::::: :::::::: :::::::+:::::: Total population (rounded>-----------------------~----1 1,400 1270,000 I 24,000 I 15,000 I 29,000 I 18,000 I 66,000 I 88,000 I 4,400 I 5,800 1110,000 1200,000 1200,000 I 51,000 I 85,000 1250,000 

I Stratigraphic position unknown. 

® 

® 

" 15,000 

~ 

0 

::0 

> 

~ 

z 

H 

~ 

trj 

~ 

0 

~ 

~ 0 

z 

~ 

trj 

::0 

trj 

~ 

Ul 

~ 

> 

~ 

trj 

~ t::::l 

~ 

q 

trj 

~ trj 

~ 

0 

::0 

~ 

> 8 

H 

0 

~z 

() 

> 

~ H 

~ 

0 

):Jj 

z 

H 

> 

~ 

--l 

C,/1 
476 SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY 

sible in stratigraphic order based on a detailed structure section across the area. The base of this section 

(samples m40, m41) is referred to the 8iphogenerina 

reedi zone of the Luisian stage, as is sample m56, and 

contains V alvulineria depressa. Samples m42 to m54 

exhibit superb development of the 8iphogenerina collO?ni zone. l\iohnian Foraminifera were found at only 

one surface locality (m55) in the l\1onterey shn1e west 

of Oso Creek. Upper(?) l\1ohnian Foraminifera are 

found in the Capistrano formation which unconformably overlies the l\1onterey shale. 

The interval from 543 feet to 303 feet is Luisian, 

probably all 8iphogenerina coll01ni zone. 

No forms characteristic of either the Luisian or the 

l\iohnian stage occur in the interval from 303 feet to 

183 feet, but the absence of the Yalvulineria fauna indicates that the rocks are l\1ohnian in age. Above 183 

feet, the samples contain Epist01ninella gy'l'Oidinafonnis and a form closely related to B1.tlin~ina 'lwigerinaformis, indicating that the strata belong to the Buli-

'lnina uvigerinaformis zone of the l\1ohnian stage. 

FAUNAL SUMMARY Table 9 is a list of Foraminifera of the. l\1onterey 

shale from Shell Oil Co.'s l\1oulton contraflush No. 32 

(well 10, table 1). Each sample represents a composite 30-foot section. 

The stratigraphic ranges of the more important and 

abundant species have been compiled from all seven 

distribution charts onto a range chart (table 10). 

TABLE 9.-D·istribntion of Foraminifera in Montereu shale from Shell Oil Co.'s Mou.lton contraftttsh No. 32 

(Numbers indicate percent of total population in sample: ·, <I;""' 1-3; t, 4-6; X, 7-10; Q, 11-15; 8, 16-20; ®, 21-30; (), 31-40; e, 41-60; 181, 61-80; •• 81-100, cf., seep. 464) 

Core samples (depth interval in feet) 

Middle Miocene Upper Miocene 

Species (arranged in order of lowest occurrence) 

Upper(?) Luisian stage Lower(?) Mohnian stage 

513-543 483-513 453-483 423-453 393-423 363-393 303-333 273-303 243-273 213-243 183-213 153-183 123-153 

-------------------------1---------------------------------------

26. Epistominella relizensis. _______________________________________________ - _ ------ __ -- __ --- _ -- __ - _ -- X X 

27. Baggina californica ______________________________________ -------- -------- -------- -------- --------

28. Hemicristellaria beali ____________________________________ -------- -------- -------- -------- --------

29. Nodosaria SP-------------------------------------------- -------- -------- -------- -------- -------- 30. Bulimina carnerosensis __________________________________ ------·- -------- -------- -------- -------- --------

31. Bolivina marginata var. gracillima _______________________ -------- -------- -------- -------- -------- -------- ________ X ________ -------- -------- -------- _______ _ 

32. Falvnlineria armtcana ___________________________________ ________ -------- -------- -------- -------- -------- -------- "" t "" X 

33. Cibicides illingi_ _________________________________________ ________ -'------- -------- -------- -------- -------- -------- -------- t cf. -------- -------- --------

34. "Uvigerinella" calijornica ________________________________ -------- -------- -------- -------- -------- -------- -------- -------- "" -------- -------- --------

35. Bolivinapisciformis------------------------------------- ------------------------------------------------------------------------ ---------------- "" 

36. Suggrunda kleinpelli_ ____________________________________ -------- -------- -------- -------- -------- -------- -------- -------- -------- "" -------- -------- --------

37. Angulogerina? SP---------------------------------------- ________ -------- -------- -------- -------- -------- -------- -------- ________ "" ----••-- ----.---- --------

38. Uvigerina hootsL ________________________________________ -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- "" 8 t 

39. Bolivina cf. B. decussata _________________________________ -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- t "" 40. B1Lliminella ecuadorana __________________________________ -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- 0 

41. Virg1Llina californiensis var. grandis ______________________ -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- "" 

42. Epistominella gyroidinaformis ___________________________ -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- X 0 43. B1Llimina uvigerinaformis ________________________________ -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- t 44. Cassid1tlina cushma1~i. ___ ------------------------- ______________ -------- -------- -------- -------- -------- -------- -------- -------- -------- _ ------- -------- "" 

Total population (rounded) ______________________ _ 900 35,000 36,000 44,000 25,000 50,000 46,000 I, 600 6, 800 24,000 6, 200 84 I, 600 
FORAMINIFERA OF MONTEREY SHALE AND PUENTE FORMATION, CALIFORNIA 477 

'l'Anu: 10.-Geoloyic ranges of 1norc im1wrta,nt Fonuninijcra 

l . .ngenidnt! 

Robulllssmilryi 

1/mni,•ri~t,•llariu hculi 

Nonionidne 

Nom'tn!Costiferum 

nlf. N. cost(ICrum 

Nm1iotarlla mioCcnicu 

Huliminidnc 

Urdimi1wllu curta 

rlrgut~tis.orima 

rmf!l~tsi/ormis 

BulimimJ corncro.orensis 

monter~a1w 

cr. n. pseudoa,U'inis 

l~vigorinciformis 

Viruulinu culifornir.n.silf 

Holivi"u ucltwmr \'nr. stn'atdla 

cul1~fl1UI vnr. 

culifo,.nir.a 

drr.~trlni!J 

girnrdmtsis 

imbrir.ntn 

marginatu \'l\r. urncilliltHl 

moddo~wris 

Jl.'lf'Udo,qp1'S.'lU 

rcJtlk•'ni 

sinuut!J vur. alisof!nsis 

Rttbacfl'ftnfl 

cf. /?.RuMtuJhrlfi 

tumidu 

W!lU(/Tiltfli 

Slltl!l''""dcl k/,:i11~·lli 

··um·u,:rim•lla''culi/i.n-nicu 

MIDDLE MIOCENE UPPER MIOO:NE 

Helizinn gtnge Luisian stage Mohnian stage 

(Not zoned here) S-rcedi Siphoucncrina collomi zone Hulimina lllliw~inufin·mi.'l wne Boli1~ina hughcsi zone 

-- --

-

llt1i(lm'iiHI l~lu:.::;ul~:::,.i ______ -J---------1·---J-------------- jmtquimm .. 'lis 

Nllh ~ert'(l'rittu 

SiJihOtJf'IIP.rilln r.ollomi 

Rotnliiduc 

l'nhrulim•rin rulit'orttir.a 

ruli.foruicu vnr. oht!sa 

cr. V. U:.:.;''':.:.:"'::.:rli::..x -------! miur.mtir.u 

Gyroiditur rotllndimnrtJo 

f.'Jxmidr..'l rost~{iwmis 

/Jntmitaa cctliforuicu 

Cm~sidulinidnc 

h'pistomindlu !IY'''Iidiuaji)t'mis 

tmbpel'uuicJml 

Cassiduliwtlimhatu 

cf. C. /'CIII .. WIIU 

Chcilo~tomcllidnc 

mioc:mu'ca vnr. glohuln 

Anomnlinidnc 

A11omcrlina salinusmtsis 

Hcuwltnaot·twfo 

Vtscorbiurlla !Jalmontr.muds 

Cibicid1's illinui 

Globigcrinidnc 

G/ohiutrri un bulloidrs 

Species are listed systematically, with geologic ranges 

indicated by a bar .graph. 

l'his chart brings out many features of the middle 

and upper ~'[iocene faunas: There is an obvious change 

in fauna at the end of Luisian time from a. generically 

diverse assemblage to one composed predominantly of 

Buliminiclae. A great many genera die out at the 

end of Luisian time, and relatively few a.re introduced 

a.t the beginning of l\1ohnian time. The Lagenidne, 

Nonions, Siphogenerinas, and the robust Valvulinerias 

all die out at the end of the middle lVIiocene. A few 

new genera are introduced at the beginning of ~1ohnian 

time, such as the group of Anomnlinidae listed, but 

-fmost of the new forms which appear in the ~1ohnian 

are new species of Bolivina and B'ltli'lnina. 

A striking thing about the entire group of faunas is 

the absence of Miliolidae and of arenaceous Foraminifera. The n.bsence of these two groups was also noted 

by J(leinpeU (1938, p. 16) in his section of the ~1onterey from the Reliz Canyon area, California. "Voodring, Bramlette, and J{ew ( 1946, p. 13-40) list only 

one arenaceous form (Bathy8iphon? sp.) and no milialids from the ~1onterey shale of the Palos Verdes :Hills, 

Calif. This is a very interesting feature of the faunas, 

and is deserving of closer study. 
478 SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY 

CORRELATION OF FORMATIONS AND STAGES 

Figure 157 consists of four columnar sections, one 

from each of the four previously described areas of the 

Santa Ana Mountains-San Juan Capistrano area. 

These columns are compiled from measured surface 

sections or from core holes. As shown in this figure, 

the columns differ greatly from one another in thickness of strata assigned to various rock and time-rock 

units. 

A tentative Relizian age is assigned to most of the 

upper part of the widespread Topanga formation, 

which is present in most of the Santa Ana Mountains 

and San Juan Capistrano area. The faunas of· the 

Topanga formation of Burruel Ridge are similar to 

those of the Topanga formation in the San ,Joaquin 

Hills, \\:est of the area shown on figure 15(). A cursory 

examination of the faunas from the San ,Joaquin Hills 

revealed the presence of N onion aff. N. costife'I'U/Jn, 

Bulindnella subfusifor'lnis, Bolivina advena var., and 

also V alvulineria depress a. 

The rocks of the Topanga formation (Relizian ( ? ) 

stage) are overlain by rocks assigned to several different zones and stages. On the west limb of the Capistrano syncline (core hole No. 14 and surface samples) 

rocks of the Siphogenerina reedi zone of the Luisian 

stage lie on the older rocks. Here, this zone grades 

upward into a thick section of the Monterey shale assigned to the Siphogenerina collmni zone. 

On Burruel Ridge, the El :M:odeno volcanics (Siphogenerina collomi zone) are apparently comformable on 

the underlying Topanga formation and are overlain 

unconformably by the Puente formation. No other 

rocks belonging to the Luisian stage are exposed in the 

northern Santa Ana Mountains. Late Luisian time is 

presumably represented by the unconformity. 

The Luisian stage is best represented in the l\1onterey 

shale in the Capistrano syncline. The Monterey rocks 

of Luisian age are more than 400 feet thick in the area 

west of Oso Creek and less than 100 feet thick in the 

area east of Oso Creek 

Rocks of l\1ohnian age are widespread in the Santa 

Ana Mountains and San ,J nan Capistrano area. In the 

Santa Ana Mountains the :Mohnian stage is represented 

by a maximum of about 3,000 feet of sandstone and 

siltstone of the Puente formation. In the area west of 

Oso Creek, the Mohnian part of the l\1onterey shale is 

about 200 feet thick while in the area east of Oso Creek 

it is more than 1,000 feet thick. 

CONCLUSIONS 

From figure 157 it can be seen that lateral changes 

in the thickness of strata assigned to the l\1ohnian and 

Luisian stages within the Monterey shale and Puente 

formation are considerable. A rather striking example 

of these changes is shown in the Monterey shale in the 

San Juan Capistrano area. Unconformably overlying 

the Topanga formation in the area east of Oso Creek, 

rocks of the Monterey assigned to the Luisian stage are 

less than 100 feet thick, and rocks of the Monterey assigned to the Mohnian stage are about 1,200 feet thick. 

The contact with the overlying Capistrano formation is 

gradational. In the area west of Oso Creek the Monterey shale unconformably overlies San Onofre breccia 

and is unconformably overlain by the Capistrano formation. The part of the Monterey shale assigned to 

the Luisian stage is about 400 feet thick; the part assigned to the Mohnian stage is less than 200 feet thick. 

There is not only a change in thickness of these 

st.rata, but also a change in their relations. In the San 

Juan Capistrano area, strata of Luisian age grade upward without lithologic change into strata of Mohnian 

age. In the Santa Ana Mountains, as typified by Burrue! Ridge, rocks of Luisian age are almost totally 

missing, and rocks of l\1ohnian age lie unconformably 

on older rocks. 

Such variations can be explained in two ways : ( 1) 

Areas of deposition changed, with the result that sediments were not deposited simultaneously over the entire 

region. Unconformities at the base and top of the 

Monterey shale represent large . gaps in the geologic 

record. The changes in fauna are not due to lateral 

ecologic variations, such as lateral change in depth 

or temperature. (2) Most of the region underwent 

simultaneous deposition; unconformities at the base 

and top of the Monterey shale and Puente formation 

represent insignificant gaps in the geologic record. 

Luisian and l\1ohnian faunas were actually contemporaneous, one indicating a deeper water facies than the 

other. 

The second possibility requires that fa,unas of Luisian age indicate a different depth facies from those of 

l\1ohnian age and that Luisian and l\1ohnian faunas 

grade laterally into one another. In . the Ventura 

basin, faunas considered to be early Pliocene in age 

have been found to grade laterally into faunas considered to be late Pliocene in age (E. L. 'Vinterer and 

D. L. Durham, written communication). 

Natland ( 1933) and Bandy ( 1953a,b) have shown 

that changes in the faunas of Recent sediments off the 

Pacific coast of southern California from deeper to 

shallower water correspond to changes in faunas from 

the early Pliocene to Pleistocene in the sediments of the 

Los Angeles and Ventura basins. The deep-water 

( :),000 feet + ) forms N onion pom pilioide8 and B'ltli-

'lnina rostrata are considered characteristic forms of the 

en,rly Pliocene. B'ltlindna subacundnata (now living 

around 3,000 feet) is characteristic of middle Pliocene, 

and Epistmninella pacifica, Uvigerina peregrina, and 

Bolivina spissa (now living around 2,000 feet) are 

characteristic of late Pliocene. Species which now live 
EXPLANATION 

~ 

~ 

Siltstone 

CTIJ Sandstone 

~ Shale 

~ 

~ 

~ 

Conglomerate 

~ 

~ 

Breccia 

:tJ...YJ.Y)..'rf.'t 

Y(2!: 

Tuff 

Calcareous siltstone 

Stage boundary 

Zone boundary 

M 20 

Fossi I locality 

AREA WEST OF 

OSO CREEK 

Shell Oil Co. core hole No. 14 

(well2) 

I 

I 

2 AREA EAST OF 

OSO CREEK Composite of outcrop 

section and Shell Oil 

Co. Contraflush No. 38 

(well6) 

Bolivina hughesi zone 

"-..,_ 

--........ 

--........ "-..,_ 

--........ 

Bulimina uvigPrinoformis zone 1 

--........ 

"-..,_ 

"-..,_ 

"-..,_ 

3 SOUTHWESTERN 

SANTA ANA MOUNTAINS 

Outcrop section 

. Oz 

~Q O::lt-<C 

(/)~ 

a:: a:: <CO 

u.u.. 

z 

0 

~ ~ 

0:: 

l2 

--........ t ·.· ,;. : ... ·:-1 M 28 

.··~·4 

[./\,_,, lA"' of fl~ 155 

~~ 

3X 

__ /,... 

./) I Area of fig. 156 I : .· 

·. ; 1 i;2.J. \-·· j/ l.____i 

INDEX MAP SHOWING 

LOCATION OF COLUMNAR 

SECTIONS 

MOHNIAN STAGE 

4 

BURRUEL RIDGE 

Rubicon Oil Company 

Wilcox No. 1 (wellS) 

LLI 

o::zo:: 

CoLLI 

~>-co 

<CZ~ (.)<(LLI 

~(.)~ 

~o\"\(\1'3~\~~7"""";1:::.:...:.. . ...:.... =I 

'"";>'~/ I ?...-. 

Bolivina hughesi zone 

hushes 

c:effi 

coco 

0::~ 

Ow 

>-~ 

0:: 

LLI 

co 

~ 

LLI 

~ 

_J 

LLI 

::> 

0 

0 

r.n 

I z 

0 

~ ~ 

0:: 

l2 

I~ 

8 M 24 ~~-:-.... :.::-...:.-:-~>~~ I MOHNIAN STAGE uvig~i;~tormis ase of Mohnian stage M 22 .:............-...:.-:-.:...-:-· c:ew . . N STAGE 

· ~ ~~ ~~s~e~_~j_b_ ~ ~ ~-=:~~ _J~ • _. _ ·--~-e~-~h.n~n.~p ~ _R~z~ s~~~. _. -?~~ :-=.:... -:-_.:...~~·$.#.;~~-TI:-MOiStN"oj 

LLI 1-

z 

LLI 

::> 

a.. 

Siphogenerina 

collomi zone <Cz (.!JQ 

z~ 

c::~ oo:: 1-2 

RELIZIAN STAGE 

3.7 Miles 7.3 Miles 13.5 Miles 

FIGURE 157.-Columnar sections of rocks of middle and late Miocene age In the Santa Ana Mountains and the San Juan Capistrano area, showing relative thicknesses of rock included 

In the Miocene stages and zones described by Kleinpell ( 1938). 

1-:j 

0 

:::0 

> 

1-< 

~ 

z 

1-< 

1-:j 

t'j 

:::0 

> 

0 

"'j 

~ 0 

z 

1-:3 

t'j 

:::0 

t'j 

~ 

Ul 

P:1 

> 

~ 

M 

~ c:l 

1-d 

q 

t'j 

z 

1-:3 

M 

"%j 

0 

~ 

~ 

> ::l 

0 

~z 

C":l 

> 

~ 1-< 

"%j 

0 

~ 

~ > 

~ 

---l 

~ 
480 SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY 

in the neritic zone ( 400 feet ±) characterize the early 

Pleistocene sediments of these basins. There are only 

a few Pliocene species that are now extinct. 

Thus it appears that in the Pliocene, faunal changes 

were due to changes in depth of water, or to changes in 

temperature of the water, or other factors that accompany changes in depth. It is difficult to discover 

whether similar faunal changes occurred in the :Miocene, for most ~Iiocene forms are no'" extinct, and it is 

necessary to work with "close living relatives'~ and 

with purely generic affinities. 

There are, however, some forms now living which 

are present in both Luisian and l\1ohnian faunas. 

These forms indicate several depths of water (Nat land, 

1933; Bandy, 1953a): 

Gyroidina rotnndirnargo _______ Abyssal (3,000 feet or greater) 

Bulim.inella subfusiformis _____ Bathyal (600 to 3,000 feet) 

Epi8t01winclla 8u.bperwviana,____ Bathyal 

Pl'01wlina ornata______________ Bathyal 

Uvir1e1·ina (costate)----------- Bathyal 

Bnliminella elegantissirna _____ Neritic (180 to 300 feet) 

Nonionclla 1niocenica:_________ Neritic 

All these forms occur in faunas of both the Luisian and 

Mohnian stages. This indicates that both these stages 

include the same faunal depth-facies. 

The presence of similar depth assemblages in both 

stages indicates that the difference between the Luisian 

and Mohnian faunas is not primarily one of depth. 

There is no evidence that the two faunas represent 

ecologic facies which grade laterally into one another. 

The foregoing evidence indicates that the variation 

in thickness of the Luisian and Mohnian stages within 

the Monterey shale and Puente formation is due to 

shifting areas of deposition. The change from early 

to late Luisian faunas in the lowest part of the Monterey shale and to Mohnian faunas in the lowest part of 

the Puente formation toward the north and east is a 

result of progressive onlap in those directions. This 

change in fauna actually represents a change in the age 

of the base of the Monterey and Puente. The change 

in thickness of rocks of Mohnian age within the Monterey shale is due to differential erosion before the deposition of the Capistrano formation. A thick section of 

the Monterey shale of Mohnian age was present in the 

area west of Oso Creek, but much of it was removed by 

erosion before deposition of the Capistrano formation. 

Such changes in area of deposition and erosion are not 

unexpected in a region as tectonically active as this one. 

Geologic mapping in the Santa Ana Mountains and 

San Joaquin Hills shows the existence of numerous 

Miocene faults and unconformities. 

If, as indicated, there is an abrupt change in faunas 

at the end of Luisian time, it must be due to some ecologic factor other than depth bf water, which does not 

appear to have changed. Perhaps this factor is a gross 

change in temperature due to a change in climate. The 

forms mentioned above which lived from the ~Iiocene 

to the present (Buli1ninella S'ltbfusifm''lrds, Epistmninella subperuviana, and costate forms of Uvigerina) 

have a fairly wide temperature tolerance. This is not 

true of the Luisian costate Siphogenerinas, which appear to resist only small changes in temperature (K:Ieinpell, 1938, p. 14). At the present time, costate Siphogenerinas occur most commonly in tropical seas, 

especially the Indo-Pacific area (I{leinpell, 1938, p. 14). 

This evidence suggests that the sharp faunal break 

at the end of the Luisian stage over most of the area 

of this report was caused by a change from a tropical 

middle Miocene sea to a temperate late l\1iocene sea. 

Further indication that this may be true is the fact that 

in the nearby Palos Verdes Hills, a sandstone sequence 

equivalent to or older than the rocks of the Siphogenerina reedi zone contain tropical molluscan migrants 

which are absent in younger beds (vVoodring and 

others, 1946). 

It seems possible that a temperature drop of only a 

few degrees Fahrenheit at the end of Luisian time may 

have been enough either to kill off the characteristic 

Luisian species of Siphogenerina and Valv'ltlineria and 

associated forms, or to drive then1 elsewhere and to 

cause the influx of the typical l\1ohnian Buliminidae. 

SYSTEMATIC CATALOG 

On the following pages is a systematic catalog listing 

all the forms referred to in this paper and giving the 

original reference and other selected references. Species were compared with primary types in the U.S. 

National Museum, 'Vashington, D.C., and at Stanford 

University. For those few species whose primary types 

were not available, careful comparison was made with 

original illustrations and with plesiotypes of the subsequent references mentioned in the synonomies. 

Species descriptions also include the stratigraphic 

occurrence of each species in the Santa Ana l\1ountains 

and San Juan Capistrano area. The numerical position of each species on each table of distribution is 

indicated by the number of the table and then the 

species number, as table 4 ( 42). 

Specimens of each species are deposited in the U.S. 

National Museum. 

Family LAG ENIDAE 

Genus ROBULUS Montfort, 1808 

Robulus miocenicus (Chapman) 

Ct'istellar'ia tniocenica Chnvmnn, 1900: California Acad. Sci. 

Proc., 3d ser., (Geology), Y. 1, p. 250, pl. 30, figs. 1, 1A .. 

Robnlus miocen,icus (Chapman). Kleinpell, 1938, Miocene 

stratigraphy of California: Tnlsa, Okla., p. 199, pl. 15, fig. 

9. 

This form is much like Chapman's but appears 

slightly thicker through the umbilicus. It is propor-
FORAMINIFERA OF MONTEREY SHALE AND PUENTE FORMATION, CALIFORNIA 481 

tionally longer in side view than that figured by 

J{leinpell. 

Occurrence: upper Luisian; table 6 (14). 

Robulus aff. R. simplex (d'Orbigny) 

These specimens cannot be assigned definitely to 

d'Orbi.gny's speci.es because poor preservation obscures 

detai.ls. 

Occurrence: upper Luisian; table 8 (39). 

J{leinpell (1938, p. 202, pl. 8, fig. 1) refers a figured 

specimen to d'Orbigny's species and reports its occurrence in the Zemorrian, Saucesian, and Relizian stages. 

Robulus smileyi Kleinpell 

Robnlu,s 8tnileui Kleinpell, 1938, Miocene stratigraphy of Califomin: Tnlsa, Okla., p. 202, 203, 111. 15, fig. 14A,B. 

Occurrence: lower Luisian to Mohnian ; tables 4 ( 40), 

6 (15),7 (20),8 (3),9 (17). 

Genus·PLANULARIA Defrance, 1824 

Planularia Iuciana Kleinpell 

Pla.nu.laria lnciana, Kleinpell, 1938, Miocene stratigraphy of 

California: 'l'ulsn, Okla., p. 207, 208, pl. 9, fig. 25A,B. 

No types available but appears very similar to J{]einpell's figures. 

Occurrence : upper Luisian ; table 8 ( 32) . 

Genus HEMICRISTELLARIA Stache, 1864 

Hemicristellaria beali (Cushman) 

C·d,~Jtella:ria bea.li Cushman, 1925 : Cushman Lab. Foram. Research Contr., v. 1, p. 24, 25, pl. 4, figs. 6-13. 

H emioristella'ria be ali (Cushman) . Kleinpell, 1938, Miocene 

stratigraphy of California: Tulsa, Okla., p. 206, 207, pl. 11, 

figs. 10-12, and pl. 12, figs. 15, 16. 

Occurrence: lower to upper Luisian; tables 6 ( 9), 

7 (19), 8 (20), 9 (28). 

Genus DENTALINA d'Orbigny, 1826 

Dentalina obliqua (Linne) 

Nnu.tilus obliqnns Linne, 1758, Systematic Naturae: ed. 10, p. 

711. 

Dentalina obliqna (Linne). Kleinpell, 1938, Miocene stratigraphy of California: Tulsa, Okla., p. 212, pl. 11, fig. 7. 

Occurrence: lower to upper Luisian; tables 6 ( 16), 7 

(18)' 8 (23)' 9 (24). 

Family NONIONIDAE 

Genus NONION Montfort, 1808 

Nonion costiferum (Cushman) 

N on·ionina. cost-if era Cushman, 1926: Cushmnn Lab. For am. 

Research Contr., v. 1, p. 90, pl. 13, :figs. 2A-C. 

N onion cosUfenmt. (Cushman). Kleinpell, 1938, Miocene stratigraphy of California : Tulsa, Okla., p. 229-231, pl. 15, figs. 

13A,B. 

Occurrence: Relizian( n to upper Luisian; tables 3 

( 3)' 4 ( 10)' 5 ( 2)' 6 ( 8)' 7 ( 13)' 8 ( 9')' 9 ( 23). 

Nonion cf. N. costiferum (Cushman) 

These specimens are small an~ may be immature specimens of N. costiferurm. They are listed sepa.ra.tely 

from the typical form because they are so abundant. 

Occurrence: Mohnian, in Shell Oil Co.'s contraflush 

No. 38, at 513-543 feet; table 6 (19). 

Nonion aft'. N. costiferum (Cushman) 

Plate 58, figures 5 and 6 

This form is very similar toN. costiferum, but differs 

from it in several respects. The dorsal side is partly 

evolute, and the ventral is completely involute. It 

also has a more rounded periphery than N. costiferum. 

Occurrence: Relizian ( ? ) ; table 3 ( 2) . 

Nonion pizarrensis W. Berry 

Nonion pizarrensis W. Berry, 1928: Jour. Paleontology, v. 1, p. 

269, figs. 1-3. 

Cushman and Kle,npell, 1934: Cushman Lab. Foram. Research Contr., v. 10, p. 4, pl. 1, fig. 9A,B. 

Kleinpell, 1938; Miocene stratigraphy of California: Tulsa, 

Okla., p. 23~235. 

Sutures are less oblique than in the specimens figured 

by Berry or by Cushman and Klein pell. 

Occurrence: upper Luisian to lower Mohnian; table 

3 (16). 

Genus NONIONELLA Cushman, 1928 

Nonionella miocenica Cushman 

N onionina a.1tris ( d'Orbigny). Cushman, 1926: Cushman Lab. 

Foram. Research Contr., v. 1, p. 91, pl. 13, fig. 4A-C. 

Nonionella miocenica Cushman, 1926: Cushman Lab. Foram. 

Research Contr., v. 2, p. 64. 

Occurrence: lower Luisian, lower Mohnian; tables 

3 (41), 5 (3), 8 (5). 

Family BULIMINIDAE 

Genus BULIMINELLA Cushman, 1911 

Buliminella curta Cushman 

B1.tliminell!a curta Cushman. 1f)2!'i : Gnshman Lab. Foram. Research Contr., v. 1, p. 33, pl. 5, fig. 13. 

Kleinpell, 1938, 1\Iiocene stratigraphy of California: Tulsa, 

Okla., p. 248, 249, pl. 7, fig. 3; pl. 15, fig. 4; and pl. 16, :fig. 8. 

Occurrence: Relizian ( ? ) to upper Mohnian; tables 

3 ( 4)' ~ ( 13)' 5 ( 7)' 6 ( 6)' 7 ( 6)' 8 ( 26)' 9 ( 8). 

Buliminella ecuadorana Cushman and Stevenson 

Plate 58, figures 1 and 2 

Bttliminclla ecuadorana Cushmnn and Stevenson, 1948: Cushman Lab. Foram. Research Contr., v. 24, p. 57, pl. 9, figs. 

19 and 20. 

Occurrence: Luisian to lower Mohnian; tables 3 (21), 

4 (33),6 (17), 7 (35), 9 (40). 

Buliminella elegantissima (d'Orbigny) 

Bttlimina elegantis'&ima, d'Orbigny, 1839, Voyage dans l'Amerique Meridionale: v. 5, pt. 5, Foraminiferes, p. 51, pl. 7, 

figs. 13 and 14. 
482 SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY 

Bu-liminella elegantissima ( d'Orbigny). Bar bat and Johnson, 

1934; Jour. Paleontology, v. 8, p. 12, figs.12, 13. 

Kleinpell, 1938, Miocene stratigraphy of California: Tulsa, 

Okla., p. 249, 250, pl. 16, fig. 10. 

Occurrence: Mohnian; table 5 (22). 

Buliminella su'bfusiformis C'ushman 

Bnlim:inella. ~mlJfnsifonnis Cushman, 1925: Cushman Lab. 

Foram. Research Contr., v. 1, p. 33, pl. 5, fig. 12. 

Kleinpell, 1938, Miocene stratigraphy of California: Tulsa, 

Okla., p. 251, 252, pl. 9, fig. 8. 

Occurrence: Relizian (?) to upper Mohnian; tables 

3 (5),4 (12), 5 (4), 7 (9), 8 (18),9 (9). 

Genus BULIMINA d'Orbigny, 1826 

Bulimina carnerosensis' Cushman and Kleinpell 

Plate 58, figures 3 and 4 

Bttlitnina carne-rosen.fi!i."' Cushman and Kleinpell, 1934 : Cushman Lab. Foram. Research Contr., v. 10, p. 5, pl. 1, figs. 

12A,B. 

Occurrence: upper Luisian; tables 5 (6), 7 (34), 9 

(30). 

This species is smaller than B. uvigerinaformis Cushman and I\Jein pell ( p. --, this report), has finer, more 

nearly continuous, and more numerous costae, and has 

a subterminal aperture. Kleinpell ( 1938, p. 259) discusses a form related to B. uvigerinaformis that is probably B. carnerosen8is and states that the fauna associated with it is probably upper Luisian in age. 

B. carnerosen8is var. mahonyi Cushman and Kleinpell ( op. cit., p. 5, pl. 1, fig. 13) is not distinguished by 

the author from B. carnerosensis s. s. 

Bulimina delreye~sis Cushman and Galliher 

Bulimina delreyensis Cushman and Galliher, 1934: Cushman 

Lab. Foram. Research Contr., v. 10, p. 25, pl. 4, fig. 8. 

Occurrence : lower Mohnian; table 3 ( 28). 

Bulimina montereyana Kleinpell 

Bulimina montereyana Kleinpell, 1938, Miocene stratigraphy of 

California: Tulsa, Okla., p. 254, 255, pl. 12, fig. 13. 

Occurrence: lower to upper Luisian; tables 3 ( 13), 5 

(1), 8 (27), 9 (14). 

Bulimina cf. B. montereyana Kleinpell 

Test shorter than typical, more sharply tapering toward initial end, and poorly preserved. 

Occurrence: lower Mohnian; table 3 ( 13). 

Bulimina ovula d'Orbigny 

Bulimina ovnla d'Orbigny, 1839, Voyage dans !'Amerique Meridionale: v. 5, pt. 5, JT'oraminiferes, p. 51, pl. 1, figs. 10, 11. 

Cushman, 1926: Cushman Lab. Forari1. Research Contr., v. 2, 

p. 55, pl. 7, fig. 2. 

This form has less-inflated chambers than that figured by J{leinpell (1938, p. 256,257, pl. 7, fig. 2). 

Occurrence : lower Luisian to Mohnian ; tables 5 ( 30) , 

7 (37),8 (4),9 (20). 

Bulimina cf. B. pseudoa11lnis Xleinpell 

Plate 57, figures 7 and 8 

This form, extremely abundant in certain localities 

in the La Vida member of the Puente formation, differs 

from the species described by Kleinpell (1938, p. 257, 

258, pl. 9, fig. 9) in having a more lobulate periphery, 

and a greater length-to-width ratio. In samples m12 

to m12d, it becomes costate and somewhat resembles 

B. uvigerinaforrni8 Cushman and J{leinpell (below, 

this report). However, it has a more regular chamber 

arrangement and is much wider than that species. 

It differs from Buli1nina delreyensis Cushman and 

Galliher (below, this report) in having more inflated 

later chambers, and in having costae, when present, 

less prominent. 

Occurrence: lower Mohnian; tables 3 (29), 5 (27). 

Bulimina pupoides d'Orbigny 

Bu.limina P1tpoides d'Orbigny, 1846, Foraminiferes Fossiles du 

bassin tertiaire de Vienne: p. 185, pl. 11, figs. 11, 12. 

Cushman and Parker, 1946: U.S. Geol. Survey Prof. Paper 

210--D, p. 105, 106, pl. 25, figs. 3-7. 

Test tapers sharply to initial end. 

Occurrence: upper Luisian; table 8 ( 40). 

B_ulimina uvigerinaformi.s Cushman and Xleinpell 

Bnlirnina twigerinaformis Cushman and Kleinpell, 1934; Cushman Lab. Foram. Research Contr., v. 10, p. 5, pl. 1, fig. 

14A,B. 

,Kleinpell, 1938, Miocene stratigraphy of California : Tulsa, 

Okla., p. 259, 260. 

Occurrence : lower Mohnian; tables 3 ( 27), 4 ( 38), 

5 ( 28) ' 9 ( 43) . 

Bulimina (Desinobulim,ina) sp. 

This form may be related to Bulimina auriculata 

Bailey (Cushman and Parker, 1946, p. 129, pl. 29, figs. 

22-24.) 

Occurrence : Mohnian; table 5 ( 26). 

Genus VIRGUI.INA d'Orbigny, 1828 

Virgulina californiensis Cushman 

V it·gulina californiensis Cushman, 1925: Cushman Lab. Foram. 

Research Contr., v. 1, p. 32, pl. 5, fig. 11A-C. 

Kleinpell, 1938, Miocene stratigraphy of California : Tulsa, 

Okla., p. 261, 262, pl. 8, fig. 4. 

Occurrence: lower Luisian t~ lower Mohnian; tables 

3 (26),4 (11),5 (15),7 (26),8 (7),9(21). 

Virgulina californiensis' Cushman var. grandis Cushman and 

Kleinpell 

Virgnlina californiensis Cushman var. grandis Cushman and 

Kleinpell, 1934: Cushman Lab. Foram. Research Contr., v. 

10, p. 9, pl. 1, figs. 15, 16. 

Occurrence: lower Mohnian; table 9 ( 41). 
FORAMINIFERA OF MONTEREY SHALE AND PUENTE FORMATION, CALIFORNIA 483 

Genus BOLIVINA d'Orbigny, 1839 

Bolivina advena Cushman var. striatella Cushman 

Bolivina advena Cushman var. st1·iatella Cushman, 1925: Cushman Lab. Foram. Research Contr., v. 1, p. 30, pl. 5, fig. 

3A,B. 

Kleinpell, 1938, Miocene stratigraphy of California: Tnlsa, 

Okla., p. 266, pl. 15, fig. 1. 

Occurrence: lower Luisian to upper Luisian; tables 

4 (4),6 (2),7 (4),8 (8),9 (4). 

Bolivina advena Cushman var. 

Plate 57, figures· 3 and 4 

Abundant in the Topa.nga formation in the Burruel 

Ridge area. Differs frmn the typical B. advena Cushman ( 1925 : Cushman Lab. Foram. Research Contr., v. 

1, p. 29, pl. 5, fig. 1) in its greater roundness in cross 

section a.nd in having the peripheries of the lastfol'lned chambers produced into blunt spines. 

Dimensions : figured specimen : length, 0.37 mm, 

breadth, 0.19 mm. thickness, 0.15 mm. Other specimens: 

length, 0.37-0.49 mm, breadth, 0.19-0.22 mm, thickness, 

0.13-0.15 mm. 

Occurrence : Relizian ( ~) to lower Luisian; tables 3 

(1), 7 (1). 

Bolivina barbarana Cushman and Kleinpell 

Bolivina barbm·an.a Cushman and Kleinpell, 1934: Cushman 

Lab. Foram. Research Contr., v. 10, p. 11, pl. 2, fig. 5A,B. 

Kleinpell, 1938, Miocene stratigraphy of California: Tulsa, 

Okla., p. 267. 

Occurrence : lower Mohnian ; tables 3 ( 43) , 4 ( 25) . 

Bolivina cf. B. barbarana Ou.s·hman and Kleinpell 

This for1n is more tapering at the apertural end than 

is the typical form. 

Occurrence : Luisian ( ~) ; table 4 ( 25). 

Bolivina brevior Cushman 

Bolivina bt·eviot· Cushman, 1925: Cushman Lab. Foram. Research Contr., v. 1, p. 31, 32, pl. 5, fig. 8A,B. 

Kleinpell, 1938, Miocene stratigraphy of California : '.rulsa, 

Okla., p. 268, pl. 7, fig. 5. 

Occurrence: upper Luisian to lower Mohnian; tables 

3 ( 42) ' 5 ( 42) ' 7 ( 41)' 8 ( 41) . 

Bolivina californica C'ushman 

Boliv·ina californica Cushman, 1925: Cushman Lab. Foram. 

Research Contr., v.1, p. 32, pl. 5, fig. 10A,B. 

Kleinpell, 1938, Miocene stratigraphy of California : Tulsa, 

Okla., p. 273,274, pl.12, figs. 4A,B, and 5. 

Occurrence: lower Luisian to lower Mohnian; tables 

3 ( 33) ' 5 ( 17) ' 8 ( 16) . 

Bolivina decurtata Cushman 

Plate 57, figures 5 and 6 

Bolivina demwtata Cushman, 1926: Cushman Lab. Foram. Research Contr., v. 2, p. 44, pl. 6, fig. 7. 

500860 0-60--4 

Kleinpell, 1938, Miocene stratigraphy of California : Tulsa, 

Okla., p. 270, 27l, pl. 21, figs. 3, 8. 

Occurrence: uppermost Luisian to lower Mohnian; 

tables 3 ( 9), 4 ( 6), 5 ( 31), 7 ( 30), 8 ( 45). 

Bolivina cf. B. decurtata Cushman 

Usually broken, but apparently lacking nodes on 

later chambers which distinguish Cushman's species 

(1926: Cushman Lab. Foram. Research Contr., v. 2, p. 

44, pl. 6, fig. 7A,B). 

Occurrence: Luisian ( ~) to upper Mohnian; tables 3 

( 20) ' 4 ( 34) ' 5 ( 20) . 

Bolivina cf. B. decussata H .. B. Brady 

Test twisted, quadrate in cross section, sutures noded; 

wall hyaline, coarsely perforate; it definitely appears 

related to Brady's species (Cushman, 1937: Cushman 

Lab. Foram. Research Spec. Pub. No. 9, p. 125, 126, pl. 

16, figs. 7-9). 

Occurrence : lower Mohnian; table 9 ( 39). 

Bolivina girardensis Rankin 

Boliv·ina giraraensis Rankin in Cushman and Kleinpell, 1934: 

Cushman Lab. Foram. Research Conti-., v. 10, p. 17, pl. 3, 

fig. 7A,B. 

Kleinpell, 1938, Miocene stratigraphy of California : Tulsa, 

Okla., p. 272. 

Occurrence: lower to upper Mohnian; table 3 (36). 

Bolivina imbricata Cushman 

Bolivina ·imbricata Cushman, 1925: Cushman Lab. Foram Research Contr., v.1, p. 31, pl. 5, fig. 7A,B. 

Kleinpell, 1938, Miocene stratigraphy of California : Tulsa, 

Okla., p. 273, 274, pl. 12, figs. 4A,B, and 5. 

Occurrence : lower to upper Luisian; tables 8 ( 25), 

9 (3). 

Bolivina interjuncta Cushman var. bicostata Cushman 

Bolivina costata d'Orbigny var. bicostata Cushman, 1926: 

Cushman Lab. Foram. Research Contr., v. 2, p. 42. 

Bolivina intet·jmwta Cushman var. bicostata Cushman, 1937: 

Cushman Lab. Foram. Research Spec; Pub. no. 9, p. 116, 

pl. 22, fig. 23. ' 

Occurrence: Luisian ( ~) to lower Mohnian; tables 

3 (46),4 (19),5 (23),6 (32). 

Bolivina marginata Cushman var. gracillima Cushman 

Bolivina marginata Cushman var. gracilis Cushman and Kleinpen, 1934: Cushman Lab. Foram. Research Contr., v. 10, 

p. 10, pl. 2, fig. 3. 

Bolivina nvarginata Cushman var. gt·acillima Cushman, 1938: 

Cushman Lab. Foram. Research Contr., v. 14, p. 29. 

Kleinpell, 1938, Miocene stratigraphy of California: Tulsa, 

Okla., p. 277. 

Specimens in sample m25 (table 4) are poorly preserved and are only questionably referred to this 

species. 

Occurrence : lower Luisian to lower Mohnian; tables 

3 (19),4 (5),5 (14),7 (25),8 (17),9 (31). 
484 SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY 

Bolivina modeloensis Cushman and Kleinpell 

Bolivina mo(lclocnsis Cush~nan and Kleinpell, 1934: Cushman 

Lab. Foram. Research Contr., v. 10, p. 10, pl. 2, fig. 4A,B. 

Occurrence : lower Mohnian; table 3 ( 37) . 

Bolivina obliqua Barbat and Johnson 

BoUv·ina olJliqua Barbat and .Johnson, 1934; Jour. Paleontology, 

V. 8, p. 15, pl. 1, fig. 20. 

Occurrence: Luisian ( ? ) to upper Mohnian; tables 

3 ( 35) ' 4 ( 7) . 

Bolivina pisciformis Galloway and Morrey 

Bolivina. p·i8ci!or1wis Galloway and Morrey, 192n: Am. Paleontology Bull., v. 15, No. 55, p. 36, pl. 5, fig. 10. 

Kleinpell, 1938, Miocene stratigraphy of California: Tulsa, 

Okla., p. 279, pl. 4, fig. 10. 

The forms in sample taken at 250-270 feet, in Shell 

Oil Co.'s core hole 14, have a less spinos~ periphery than 

the typical forms. 

Occurrence : lower Mohnian; tables 7 ( 40), 9 ( 35) . 

Bolivina pseudospissa Kleinpell 

Bol·ivi,na psendostJissa Kleinvell, 1938, Miocene stratigraphy of 

California: 'l'ulsa, Okla., p. 279--280, pl. 21, fig. 6. 

In the lower Luisian in Shell Oil Co.'s core hole 14 

occur forms which resemble B. pseudospissa. They 

are poorly preserved and cannot be identified with 

certainty. 

Occurrence of typical form: lower M~ohnian; tables 

3 ( 38) ' 4 ( 41) ' 5 ( 32) ' 6' ( 22) ' 7 ( 5) . 

Bolivina rankini Kleinpell 

Bolivina 1·a,nk'in:i Kleinpell, 1938, Miocene stratigraphy of California : Tulsa, Okla., p. 280, pl. 22, figs. 4, 9. 

Occurrence: upper Luisian to lower Mohnian; tables 

4 (31),5 (18),6 (26),7· (24),9 (19). 

Bolivina cf. B. rhomboidalis (Millett) 

Plate 57, figures .13 and 14 

This fonn was compared with Millett's figures of 

Tewtulm·ia rh01nboidali8 (1899: .Tour. Roy. Micr. Soc., 

p. 559, pl. 7, fig. 4) and was found to be very similar. 

It ·was also compared with plesiotypes from the 

Marshall Islands, which show a wide range of variation. 

This Miocene form is characterized by its rectangular 

cross section, strongly overlapping chambers, and very 

coarse perforations. 

Occurrence: upper Luisian; tables 8 (31), 9 (18). 

Bolivina salinasensis Kleinpell 

Bolivi·na, 8(l,linase11,8is Kleinpell, 1938, Miocene. stratigravhy of 

California : Tnhm, Okln., p. 2RO, 2R1, 111. H, fig. (), vi. 15, fig. 3. 

Occurrence: lower to upper Luisian; table 8 ( 19). 

Bolivina cf. B. salinasensis Kleinpell 

Sutures more curved than those of form figured by 

J(leinpell. 

Occurrence: lower 1\{ohnian; table 3 ( 24). 

Bolivina cf. B. seminuda Cushman 

The chambers of this rare form are lower than those 

of the typical Q. se1ninuda (Cushman, 1937: Cushman 

Lab. Foram. Research Spec. Pub. No.9, p. 142, pl. 18, 

figs. 13-15). 

Occurrence : Mohnian; table 5 ( 41). 

Bolivina sinuata Galloway and Wissler var. alisoensis Cushman 

and Adams 

Bolivina si,nnnta, Galloway and \Vissler var. alisoensis Cushman 

and Adams, 1935: Cushman Lab. Foram. Research C()ntr., 

Y. 11, p. 19, 20, pl. 3, fig. 5. 

Occurrence : lower Luisian to lower 1\'lohnian; tables 

3 (12),4 (27),5 (12),6 (13),7 (33),8 (30). 

Bolivina subad~ena Cushman 

'.: 

Boliv,ina snbadven{L Cushman, 1926: Cushman Lab. Foram. 

Research Contr., v. 2, p. 44, pl. 6, fig. 6A,B. 

Occurrence: upper Luisian to lower Mohnian; tables 

8 ( 36)' 9 ( 25). 

Bolivina cf. B. subadvena C'ushman 

- Sutures appear straighter and less oblique than those 

of the typical B. subadvena. 

Occurrence: Relizian ( ? ) to lower Moluiian; table 3 

(10). 

Bolivina cf. B. subhughesi Kleinpell 

Plate 57, figures 11 and 12 

Test twisted, nearly round in cross section; later 

chambers greatly inflated. This form is common in the 

La Vida member of the Puente formation and closely 

resembles J(leinpell's species (J(leinpell, 1938, p. 283, 

284, pl. 21, figs. 7, 12). 

Occurrence : lower Mohnian ; table 3 ( 25). 

Bolivina tumida Oushman 

Bolivina, tnmida Cushman, 1925: Cushman Lab. Foram Research Contr., v.l, p. 32, pl. 5, fig. 9A,B. 

Kleinpell, 1938, Miocene stratigraphy of California : Tulsa, 

Okln., p. 284, 285, pl. 9, fig. 4. 

Occurrence: Relizian ( ? ) to upper Mohnian; tables 

3 ( 8)' 4 ( 8)' 5 ( 13)' 7 ( 28)' 8 ( 13)' 9 ( 6). 

Bolivina cf. B. vaughani Natland 

Plate 58, figures 7 and 8 

Bolivina 1mu.yhani Natland. Crouch, 1952: Am. Assoc. Petroleum Geologists Bull., Y. 3(), p. 8."'{0, pl. 3, fig. 10. 

Not Bolivina vaurf'lw.n:i Nntland, 1938: Scripps Inst. Oceanogrnvhy 'l'ech. Ser., Bull., v. 4, p. 146, pl. 5, fig. 11. 

These 1\{iocene forms are much larger than Natland's Recent forms. Also they are more tapering 

toward the apertural end. Upper Luisian specimens 

occasionally develop costae on the early part of the 

test. 

Occurrence: upper Luisian to upper 1\-fohnian; tables 

3 ( 18)' 4 ( 37)' 5 ( 33)' 6 ( 28)' 7 ( 14)' 8 ( 43)' 9 ( 13). 
FORAMINIFERA OF MONTEREY SHALE AND PUENTE FORMATION, CALIFORNIA 485 

Bolivina woodringi Kleinpell 

B.oli'lii'lln 1voodrht!J'i Kleinvell, 1938, Miocene stmtigmplly of 

California : 'fnlsn, Okla., v. 285, 28(), pl. 21, figs. 4, 5, 1938. 

Occurrence: M:ohnian; tables 3 (40), 5 (39), 7 (38), 

8 ( 44). 

Bolivina cf. B. woodringi Kleinpell 

Plnte 57, figures 9 nnd 10 

Occnrrino· in a number of samples from the southern b • 

Santa Ana, l\{ounta,ins are specimens of Bolivina which 

closely resemble J(leinpell's species. They differ chiefly 

in t.heir more acute, sometimes keeled periphery and 

broader test .. 

Occurrence: Luisian ( n to upper l\iolmian; tables 

3 (40),4 (22), 5 (39). 

Genus SUGGRUND·A Hoffmeister and Berry, 1937 

Suggrunda kleinpelli Bramlette 

Su,rJ,!/1'111/dn J,;leinJJClli Bramlette, ·in 'Voodl'ing and Bramlette, 

WGO: U.S. Geol. Snrvey Prof. Paper 222, p. 58, 59, pl. 23, 

t'igs. 4, 5, 9. 

Occurrence: R.elizian ( ~) to lower l\iohnian; tables 3 

(7), 4 (20), 5 (19), 6 (35.), 7 (27), 8 (10), 9 (36). 

Genus UVIGERINA d'Orbigny, 1828 

Subge~us UVIGERINELLA Cushman, 1926 

The ~ipertural characteristics which distinguish this 

subgenus ·appear to be smnewhat variable, even when 

good examples are found. Also, species assigned to 

it appear to belong to other genera; that is, Uv,igerinella californica var. gTacilis appears close to 

A nguloge'rina. 

"Uvigeri~ella" californica CuS'hman 

U·vi.rJCri.nn ( U'liiycrinclln) cnUforn'lca. Cushman, 1926: Cushman 

Lab. 1!-.,oram. Research Contr., v. 2, p. 58, pl. 8, figs. 2A,B, 

and 5. 

Uv·i[JGri:nella. ('aU.fo·r·nicn Cushman. Kleinpell, 1938, Miocene 

strntigt·nphy of California: 'l'ulsa, Okla., p. 287, 288, pl. 

7, fig. 9 and pl. 9, fig. 13. 

Occurrence: Luisian to lower Mohnian; tables 4 · ( 32), 

6 ( 10)' 7 ( 29)' 9 ( 34). 

"Uvigerinella" californica Cushman var. 

Forms with faint costae on all or on early part of 

test. '\Vell preserved forms have three carinae on later 

part of test.. l\1ay be Anguloget·ina sp. 

Occurrence: lower Luisian to Molmian; tables 4 (9), 

5 (10), 8 (29). 

Genus UVIGERINA sensu stricto 

Uvigerina hootsi Rankin 

liiiifJCrina. hoot.'li Rauki•1, ·i.n Cnshmnn and Kleinpell, 1934: 

Cm~hmnn Lab. l!'ornm. Research Contt·., v. 10, p. 22, pl. 3, 

figs. 8 and n. 

Occurrence: lower l\iohnian; tables 5 (38), 6 (21), 

7 ( 31), 9 ( 38). The specimens in the interval from 

193 to 233 feet in the Shell Oil Co.'s contraftush No.· 38 

(table 6 (21)) are poorly preserved, and are only 

doubtfully referred to this species. 

Uvigerina joaquinensis Kleinpell 

Plate 57, figures 1 and 2 

Uvigerina, joa.quinensi8 Kleinpell, 1938, Miocene stratigraphy 

of California: Tulsn, Okla., p. 296, pl. 17, figs. G, 10, 11. 

Occurrence: upper Luisian to lower l\t[ohnian; tables 

3 ( 39)' 4 ( 36)' 5 ( 9). 

Uvigerina subperegrina Cushman and Kleinpell 

Uvigerina, su.bpercgrinu Cushman and Kleinpell, 1034: Cushman Lab. Foram. Research Coutr., Y. 10, v. 12, pl. 2, figs. 

9-11. 

Occurrence: lower Luisian to upper 1\tiohnian; tables 

3 ( 30) ' 4 ( 23) ' 5 ( 34) ' 6 ( 7) ' 7 ( 11) ' 8 ( 28) ' 9 ( 7) . 

Genus HOPKINSINA Howe and Wallace, 1933 

Hopkinsina magnifica Bramlette 

Jlopl.:insina, ma.gn.i:ficn Bramlette, in Woodring and Bramlette, 

1950: U.S. Geological Survey Prof. Paper 222, p. 59, GO, 

pl. 22, figs. 1-3, 5. 

Occurrence: Upper l\iohnian; table 3 ( 48). 

Genus SIPHOGENERINA Schlumberger, emend. Mathews, 1945 

Siphogenerina collomi Cushman 

f:Nphoycncr-ina, collatni Cushman, 1925: Cushman r .. ab. Foram. 

Research Contr., v.1, p. 2, pl. 4, fig. 3. 

Kleinpell, 1938, Miocene stratigraphy of California: ~rulsa, 

Okln., p. 300, pl. 15, fig. 11. 

?SiiJhor;cncri:na, 1t:uuifo·rrn-is Kleinpell, 1938, Miocene stratigraphy of California: 'l'ulsa, Okla., p. 303, pl. 15, figs. 10, 

12. 

Primary types of S. collmni were examined and were 

identical with these specimens. No primary types of 

S. n,rucijm·1nis were examined, but plesiotypes assigned 

by Kleinpell to this species appear to be within the 

range of variation of S. collomi. Therefore, S. nucifo'1'1nis is questionably included in the synonomy of S. 

collomi. 

Occurrence: lower to upper Luisian; tables 6 ( 1), 

7 ( 21) ' 8 ( 22) ' 9 ( 5) . 

Genus ANGULOGERINA Cushman, 1927 

Angulogerina( 1) sp. 

These forms are nearly always broken, but better 

preserved specimens have three carinae on later part 

of test. These may be the same form as "U vigerinella" 

calijon1ica Cushman va.r. (see to left). 

Occurrence: l\iolmian; tables 3 (47), 4 (39), 7 (42), 

9 (37). 

Family ROTALIIDAE 

Genus VALVULINERIA Cushman, 1926 

Valvulineria araucana (d'Ol'bigny) 

Ro:w.l·inn a.rnucamn d'Orbigny, 183!): Voyage dans l' Amerique 

1\Ieridionnle: v. 5, pt. 5, Foraminiferes, p. 44, pl. 6, figs. 

16-18. 
486 SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY 

ValvnUnerin araucana ( d'Orbigny). Cushman, 1927 : Scripps 

Inst. Oceanography Tech. Ser., Bull., v. 1, p. 160, pl. 4, figs. 

7, 8. 

Occurrence : lower Mohnian; tables 6 ( 23), 9 ( 32) . 

Valvulineria californica Cushman 

Plate 59, figures 4-6 

F ([,lvnlineria californica Cushman, 1926: Cushman Lab. Foram. 

Researeh Contr., v. 2, p. 60, pl. 9, fig. lA-O. 

Kleinpell, 1938, Miocene stratigraphy of California: Tulsa, 

Okla., p. 308, 309, pl. 13, fig. 6A-O. 

Occurrence: Luisian; tables 5 (11), 6 (4), 8 (6). 

Valvulineria californica Cushman var. obesa Cushman 

Valvnlinerin ca.lifornicn Cushman var. obesa Cushman, 1926 : 

Cushman Lab. Forum. Research Contr., v. 2, p. 61, pl. 9, 

fig. 2A-O. 

Kleinpell, 1938, Miocene stratigraphy of California: Tulsa, 

Okla., p. 310, 311, pl. 14, fig. 12A-O. 

Occurrence : lower to upper Luisian; tables 3 ( 14), 

4 (2),6 (5),7 (10),8 (15),9 (2). 

Valvulineria depressa Cushman 

Plate 59, figures 10--12 

Valmtlineria 1niocenica Cushman var. clepressa Cushman, 1926 : 

Cushman Lab. Forum. Research Contr., v. 2, p. 61, pl. 9, 

fig. 7A-O. 

V alvnlineria 'lepressa Cushman. Kleinpell, 1938, Miocene 

stratigravhy of California: Tulsa, Okla., p. 311, 312, pl. 9, 

fig. 22.4.-0 and pl. 13, fig. 5A-O. 

Occurrence: Relizian ( ~) to lower Luisian; tables 3 

(11),7 (2),8 (2). 

Valvulineria cf. V. depressa Cushman 

Specimens poorly preserved, may be V. araucana 

( d'Orbigny). 

Occurrence : Mohnian; table 8 ( 2). 

Valvulineria cf. V. grandis Cushman and Galliher 

Plate 59, figures 13-15 

This form differs from V. grandis Cushman and 

Galliher ( 1934: Cushman Lab; For am. Research 

Contr., v. 10, p. 26, pl. 4, fig. 12A-O) in having a more 

involute ventral side and raised sutures. Because only 

the holotype of V. grandis is available in the U.S. N ational Museum, the affinity of these forms could be 

neither proved or disproved. 

Occurrence: upper Luisian to lower Mohnian; tables 

3 ( 22) ' 4 ( 3) ' 5 ( 36) . 

Valvulineria cf. V. grandis is apparently related to 

V. cctlifoTnica Cushman (p. 486, pl. 4, figs. 10-12) 

from which it can easily be distinguished by its oblique, 

raised, sigmoid-curved sutures. It appears at the end 

of the Luisian, and its range extends into the Mohnian 

after the true V. californica has disappeared. It seems 

to represent the last flourishing of the californica-type 

Valvulinerias in this region. 

V alvulineria cf. V. grandis rather closely resembles 

V. scintillans Coryell and Mossman ( 1942: Jour. Paleontology, v. 16, p. 236, pl. 36, figs. 13-15), but it is much 

fatter and has a more rounded periphery than that 

species. Types of V. scintillans were unavailable at 

Columbia University. 

It can be distinguished from V. n~iocenica Cushman 

(below, pl. 59, figs. 7-9) by its smaller number of 

chambers, less limbate ventral sutures, and its aperture. 

Immature forms of V. cf. V. grandi8 resemble the 

form described by I\]einpell ( 1938, p. 325, 326, pl. 11, 

fig. SA-O) as Baggina robusta. 

Valvulineria miocenica Cushman 

Plate 59, figures 7-9 

Valvulineria miocenica Cushman, 1926 : Cushman Lab. Foram. 

Research Contr., v. 2, p. 61, pl. 8, figs. 9, 10, pl. 9, fig. 3A-O. 

Kleinpell, 1938, Miocene stratigraphy of California : Tulsa, 

Okla., p. 313, pl. 16, fig. lA-O. 

Occurrence: lower to upper Luisian : tables 6 ( 3), 7 

( 12)' 8 ( 24)' 9 ( 1). 

Valvulineria cf. V. miocenica Cushman 

Poorly preserved specimens resembling Valvuline'ria 

miocenica. 

Occurrence: Luisian ( ~) to lower Mohnian; table 6 

(24). 

Valvulineria cf. V. ornata Cushman 

These forms resemble Valvulineria miocenica Cushman but are more equally biconvex than that species, 

and have wider clear areas around sutures. They are 

fatter than the typical V. ornata ( 1926: Cushman 

Lab. Foram. Research Contr., v. 2, p. 61, pl. 9, fig. 

4A-O). 

Occurrence: upper Luisian; table 9 (22). 

Valvulineria williami Kleinpell 

Valvulineria williami Kleinpell, 1938, Miocene stratigraphy of 

California: Tulsa, Okla., p. 315, fig. 14A-O. 

Occurrence: Luisian ( ~) ; table 4 ( 1). 

Genus GYROIDINA d'O:t4bigny, 1826 

Gyroidina rotundimargo R. E. and K. C. Stewart 

Plate 59, figures 1-3 

Gyroidi'na sol,lanii d'Orbigny var. rotmulimargo R. E. and- K. 

C. Stewart, 1930: Jour. Paleontology, v. 4, p. 68, pl. 9, fig. 

3A-O. 

Occurrence: upper Luisian to lower Mohnian; tables 

3 (49), 4 (24), 5 (37), 6 (:31), 7 (16), 8 (34), 9 (10) .. 

Gyroidina sp. 

Too poorly presenred to be assignable to any species, 

but does not appear to be G.1·ot?..tndinwrgo R. E. and J(. 

C. Stewart. 

Occurrence : lower l\1:ohnian; table a ( 23). 
FORAMINIFERA OF MONTEREY SHALE AND PUENTE FORMATION, CALIFORNIA 487 

Genus .EPONIDES Montfort, 1808 

Eponides rosaformis Cushman and Kleinpell 

Eponilles rosatormis Cushman and Kleinpell, 1934: Cushman 

Lab. Foram Research Contr., v. 10, p. 14, pl. 2, fig. 18A-O. 

Kleinpell, 1938, Miocene stratigraphy of California: Tulsa, 

Okla., p. 321. 

Occurrence: upper Luisian to lower Mohnian; tables 

3 (32), 5 (29), 6 (29), 7 (23),8 (37). 

Genus CANCRIS Montfort, 1808 

Cancris baggi Cushman and Kleinpell 

Oanoris ba,ggi Cushman and Kleinpell, 1934: Cushman Lab. 

Foram Research Contr., v. 10, p. 15, pl. 3, fig. 2A-O. 

Occurrence: upper Luisian: tables 8 ( 33), 9 ( 16). 

Genus BAGGINA Cushman, 1926 

Baggina californica Cushman 

Ba,ggina, oa.lifornioa Cushman, 1926: Cushman Lab. Foram .. 

Research Contr., v. 2, p. 64, pl. 9, fig. 8A-O. 

Kleinpell, 1938, Miocene stratigraphy of California : Tulsa, 

Okla., p. 324, pl. 13, fig. 3A-O. 

Occurrence: lower Luisian to lower Mohnian; tables 

3 (45), 4 (26), 5 (35), 6 (11), 7 (17), 8 (21), 9 (27). 

Family CASSIDULINIDAE 

Genus EPISTOMINELLA Husezima and Maruhasi, 1944 

Epistominella gyroidinaformis (Cushman and Goudko1f) 

Pulvinulinella gy1·oidina[o1·mis Cushman and Goudkoff, 1938 : 

Cushman Lab. Foram. Research Contr., v. 14, p. 1, 2, pl. 

1, figs. 1, 2. 

Kleinpell, 1938, Miocene stratigraphy of California: •.rulsa, 

'Okla., p. 328, pl. 18, figs. 17-19. 

Occurrence: upper Luisian to lower Mohnian; tables 

3 ( 15)' 4 ( 28)' 5 ( 5)' 6 ( 20)' 7 ( 32)' 9 ( 42). 

Epistominella pacifica (Cushman) 

Plate 58, figures 12-14 

P1t,lvinttlinella pacifica Cushman, in Cushman, Stewart, and 

Stewart, 1930: San Diego Soc. Nat. History Trans., v. 6, 

p. 73, pl. 6, fig. 5. 

Kleinpell, 1938, Miocene stratigraphy of California: Tulsa, 

Okla., p. 328, 329. 

Occurrence: Mohnian; tables 4 ( 29), 6 ( 25). 

Epistom.inella relizensis (Kleinpell) 

P1tlvin1tlinella 1·elizensis Kleinpell, 1938, Miocene stratigraphy 

of California: Tulsa, Okla., p. 329, 330, pl. 10, fig. 10A-O. 

NaUand, 1950: Geol. Soc. America Mem. 43, pt. 4, p. 33, pl. 9, 

fig. 4A-O. 

Primary types of this species were not examined, 

but cmnparison with Kleinpell's figures and descriptions indicates that these specimens should be referred 

to E. relizensis. 

Occurrence : lower Luisian to upper Mohnian; tables 

3 ( 17)' 4 ( 14)' 5 ( 21)' 6 ( 27)' 7 ( 7)' 8 ( 12)' 9 ( 26). 

IGeinpell states that the range of his species is upper 

Saucesian to upper Luisian. Its occurrence here in 

the Mohnian· represents an upward extension of its 

range. 

Epistominella subperuviana (Cushman) 

Pulvinulinella 81tbperu,viana Cushman, 1926 : Cushman Lab. 

Foram. Research Contr., v. 2, p. 63, pl. 9, fig. 9A-O. 

Occurrence: upper Luisian to lower Mohnian; tables 

4 ( 35)' 5 ( 16)' 6 ( 18)' 7 ( 22)' 8 ( 42)' 9 ( 11) . 

Epistominella thalmanni (Stainforth and Stevenson) 

Plate 58, figures 9-11 

Palmerinella tha-hnanni Stainforth and Stevenson, 1946: Jour. 

Paleontology, v. 20, p. 563, pl. 86, figs. 7-10. 

Pseudoparella thalmanni ( Stainforth and Stevenson). Cushman and Stevenson, 1948: Cushman Lab. Foram. Research, 

v. 24, p. 66, pl.10, figs. 26, 27. 

Specimens from California were compared with 

Stainforth and Stevenson's lower ~'fiocene forms and 

were found identical. 

Occurrence: Mohnian; Table 7 ( 39). 

This form is very close to Epistominella evax Bandy 

( 1953a, p. 179, pl. 23, fig. 1) from the Recent off the 

Pacific coast of California.. It is flatter, and the dorsal sutures are straighter. The periphery is less lobulate, with moderately wide carina. 

Genus CASSIDULINA d'Orbigny, 1826 

Cassidulina cushmani R. E. and K. C. Stewart 

Oassillulina oushmani R. E. and K. C. Stewart, 1930: Jour. 

Paleontology, v. 4, p. 71, pl. 9, fig. 5. 

Occurrence: lower Mohnian; tables 3 ( 44), 5 (25), 

7 ( 36) ' 9 ( 44) . 

Cassidulina limbata Cushman and Hughes 

Oa,ssidulina limbata Cushman and Hughes, 1925 : Cushman Lab. 

Foram. Research Contr., v. 1, p. 12, pl. 2, fig. 2A-C. 

Kleinpell, 1938, Miocene stratigraphy of California: Tulsa, 

Okla., p. 333, pl. 9, fig. 21. 

Occurrence: Luisian(~); table 4 (16). 

Cassidulina cf. C. margareta Karrer 

Thinner test than that figured by Kleinpell (1938, 

p. 333, 334, pl. 8, fig. 10) ; periphery subacute. 

Occurrence : Luisian ( ~) ; ta.ble 4 ( 17). 

, Cassidulina cf. C. panzana Kleinpell 

Differs from the form described by Kleinpell (1938, 

p. 335, pl. 8, fig. 19) in presence of clear umbilical 

area. Possibly related to 0. translucens Cushman and 

Hughes (1925: Cushman Lab. Foram. Research Contr., 

v. 1, p. 15, pl. 2, fig. 5) in shorter chambers, straighter 

sutures, and subacute periphery. 

Occurrence: Luisian; tables 6 ( 12), 7 ( 3). 

Cassidulina williami Kleinpell 

Oassidulina williami Kleinpell, 1938, Miocene stratigraphy of 

California : Tulsa, Okla., p. 337, pl. 14, fig. 5, pl. 17, figs. 

7, 8. 

Occurrence: lower Luisian; table 8 ( 1). 
488 SHORTE.R CONTRIBUTIONS TO GENERAL GEOLOGY 

Family CHnOSTOM.ELLIDAE 

Genus PULLENIA Parker and Jones, 1862 

Pullenia miocenica Kleinpell 

Pullenia rniocenica Kleinpell, 1938, Miocene stratigraphy of 

California: Tulsa, Okla., p. 338, 339, r>l. 14, fig. 6. 

Occurrence: lower Luisian to lower l\1:ohni,an; table 

8 (11). 

Pullenia miocenica Kleinpell var. globula Kleinpell 

Pullenia rniocenica Kleinpell var. globula Kleinpell, 1938, 

Miocene stratigraphy of California: Tulsa, Okla., p. 340, 

pl. 16, fig. 2A,B. 

Occurrence: upper Luisian; tables 7 (15), 8 (3!'5), 9 

(15). 

Family GLOBIGERINIDAE 

Genus GLOBIGERINA d'Orbigny, 1826 

Globigerina bulloides d'Orbigny 

Globigerina bulloides d'Orbigny. Kleinpell, 1938, Miocene 

stratigraphy of California: Tulsa, Okla., p. 343, 344, pl. 7, 

fig. 17. 

Occurrence: lower Luisian to upper Mohnian; tables 

3 (31), 4 (18), 5 (24), 6 (30), 7 (8), 8 (14), 9 (12). 

Family ANOM'ALINIDAE 

Genus ANOMALINA d'Orbigny, 1826 

Anornalina salinasensis Kleinpell, 1938, Miocene stratigraphy 

of California: Tulsa, Okla., p. 347, pl. 13, fig. 1A.-C. 

Occurrence: upper Luisian; table 8 (38). 

Genus PLANULINA d'Orbigny, 1826 

Planulina ornata (d'Orbigny) 

Truncatttlina ornata d'Orbigny, 1839, Voyage dans !'Amerique 

:Meridionale: v. 5, pt. 5, Foraminiferes, p. 40, pl. 6, figs. 

7-9. 

Planulina ornata ( d'Orbigny). Cushman, 1927, Scripps Inst. 

Oceanograr>hy, Tech. Ser. Bull., v. 1, p. 176, pl. 6, fig. 12. 

Occurrence: Luisian ( ? ) to lower Mohnian; tables 3 

( 34) ' 4 ( 15) ' 5 ( 40) ' 6 ( 34) . 

Genus· DISCORBINELLA Cushman and Martin, 1935 

Discorbinella valmonteensis Kleinpell 

Discorbinella valmontecnsis Kleinpell, 1938, Miocene stratigraphy of California : Tulsa, Okla., p. 350, 351, pl. 21, figs. 

14-16. 

Occurrence: lower l\1:ohnian; trable 8 ( 46). 

Genus CIBICIDES Montfort, 1808 

Cibicides sp. 

Rare, nondescript form. 

Occurrence: Luisian (?) ; table 4 (21). 

Cibicides illingi (Nuttall) 

Cibicidcs illingi (Nuttall). Kleinpell, 1938, Miocene stratigraphy of California: Tulsa, Okla., p. a54, pl. 19, fig. 10, 

pl. 20, figs. 18-20. 

This form was compared with IGeinpell's types and 

found to be identical. 

Occurrence: upper Luisian to lower l\1:ohnian; tables 

4 ( 30) ' 5 ( 8) ' 6 ( 33) ' 9 ( 33) . 

Foraminifera localities in the Miocene series, Santa Ana Mountains and San Juan Capistrano area, California 

No. used in 

this report I USGS I permanent No. 

Field No. Collector Description of locality 

Topanga formation 

mL ________ !11413 ______ Y8b ________ D. M. Kinney, R. F. Yerkes __ 36,700 ft south and 6,275 ft west of northeast corner 

of Orange quadrangle; elevation 710 ft. Betweer 

Panorama Heights and Peters Canyon. 

m2 _________ !11414 ______ ------------ D. M. Kinney _________________ 35,600 ft south and 7,050 ft west of northeast corner 

Orange quadrangle; elevation 720 ft. Between 

Panorama Heights and Peters Canyon. m3 _________ !11415 ______ ------------ ___ do _______________________ 17,300 ft south and 11,950 ft west of northeast corner 

Orange quadrangle; elevation 620ft. Between Walnut 

Canyon and Cerro Villa Heights. 

m4 _________ f11416 ______ ---------------------------------------- 18,775 ft south and 24,250 ft west of northeast corner 

Orange quadrangle. McKee-Kokx Community 8-1 

• well, core sample from2, :354 to 2,360 ft. 

El Modeno volcanics 

m5 _________ 1 !11417 ______ 1 Y6a ________ l R. F. Yerkes ________________ l17,575 ft south and 950 ft west of northeast corner 

of Orange quadrangle; elevation 1,130 ft. Near 

divide between ·walnut Canyon and \Veir Canyon. 

Puente formation 

m6 _________ f11418 ______ Y5e ________ R. F. Yerkes ________________ 35,550 ft south and 37,500 ft west of northeast corner 

Black Star Canyon quadrangle; elevation 720 ft. 

Near Santiago Canyon Road and BM 791. 

m7 _________ fl1419__ __ _ _ S344 _______ J. E. Schoellhamer ___________ 35,350 ft south and 18,575 ft west of northeast corner 

Orange quadrangle; elevation 290 ft. Road cut near 

La Paloma. 

m8 __________ !11420 _____ ------------· _____ do _____________________ 18,200 ft south and 18,575 ft west of northeast corner 

Orange quadrangle; elevation 440 ft. Road cut on 

Mesa Drive near Cerro Villa Heights. m8a _____________________________________ do _____________________ 17,550 ft south and 20,450 ft west of northeast corner 

Orange quadrangle; elevation 400 ft. Between 

Burruel Point and Cerro Villa Heights. 
FORAMINIFERA OF MONTEREY SHALE AND PUENTE FORMATION, CALIFORNIA 489 

Foraminifera localities in the Miocene series, Santa Ana Mountains and San Juan Capistrano area, California-Continued 

No. used In 

this report I USGS I permanent No. 

Field No. Collector Description of locality 

Puente ronnation-Continued 

m9 _________ f1142L ____ S193 _______ D. M. Kinney, J. E. Schoenharner. 

m10 ________ f11422 _____ Y5d _______ D. M. Kinney, J. E. Schoellhamer, R. F. Yerkes. 

m1L _______ f11423 _____ S67 ________ J. E. Schoellhamer __________ _ 

m12 ________ f11424 _____ S366 ____________ do ____________________ _ 

m12a_____ _ _ _____ __ _ _ ___ S367 ____________ do ____________________ _ 

m12b _______ ------------ S370 ____________ do ____________________ _ m12c____ _ _ _ f11425______ S37L ___________ do ____________________ _ 

m12d _______ ------------ S374 ____________ do ____________________ _ m14 ________ f11426 _____ S236 ____________ do ____________________ _ 

m16 ________ f11428 _____ S2 ______________ do ____________________ _ 

m17 ________ f11429 ______________________ do ____________________ _ 

Monterey shale 

m18 ________ f11430 _____ S259a ______ J. E. Schoellhamer_ ________ _ 

m19 ___ ----- f1143L ____ S259 ____________ do ____________________ _ 

m20 ________ f11432 _____ Y78a ______ J. E. Schoellhamer, R. F. 

Yerkes. 

m2L___ __ __ f11433 _____ Y78b ___________ do ____________________ _ 

m22__ _ _ _ _ _ _ f11434_ _ _ _ _ Y78c ____________ do ____________________ _ 

m23__ _ _ _ _ _ _ f11435 __ ~ _ _ Y79e ____________ do ____________________ _ 

m24 ________ f11436 _____ Y78d ___________ do ____________________ _ 

m25 ________ f11437 _____ Y79d ___________ do ____________________ _ 

m26__ _ _ _ _ _ _ fl1438_ _ _ _ _ Y79c ____________ do ____________________ _ 

m27 -------- f11439 _____ Y79b ___________ do ______ ------------ __ _ 

m28____ _ __ _ fll440_ _ _ _ _ Y78f_ ___________ do ____________________ _ 

m29 ________ fl144L ____ S289 _______ J. E. Schoellhamer __________ _ 

m30__ _ _ _ __ _ f11442_ _____ S287a ___________ do ____________________ _ 

m3L _______ f11443 _____ S307 ____________ do ____________________ _ 

m32 ________ f11444 _____ V102 _______ J. G. Vedder_ _____________ _ 

150 ft north and 32,750 ft west of northeast corner of 

Black Star Canyon quadrangle; elevation 335 ft. 

In Santa Ana River bottom. 

34,650 ft south and 1,900 ft west of northeast corner Orange quadrangle; elevation 620 ft. Near Peters 

Canyon Reservoir. 

3,325 ft south and 31,000 ft west of northeast corner of 

Black Star Canyon quadrangle; elevation 600 ft. 

Old road cut above Santa Ana Canyon road and west 

of Gypsum Canyon. 

39,250 ft south and 30,200 ft west of northeast corner of 

Black Star Canyon quadrangle; elevation 820 ft. 

Road cut near south shore of Irvine Lake. 

Same as m12, but 6ft stratigraphically higher. 

Same as m12, but 35 ft stratigraphically higher. 

Same as m12, but 48.5 ft stratigraphically higher. 

Same as m12, but 81.5 ft stratigraphically higher. 

40,600 ft south and 36,900 ft west of northeast corner Black Star Canyon quadrangle; elevation 1,160 ft. 

Near divide between Peters Canyon and Santiago Canyon road. 

4,200 ft south and 32,500 ft west of northeast corner Black Star Canyon quadrangle; elevation 660 ft. 

Near Santa Ana Canyon road west of Gypsum Canyon. 

16,500 ft south and 19,400 ft west of northwest corner Orange quadrangle; elevation 560 ft. Between 

Burruel Point and Cerro Villa Heights. 

20,950 ft south and 26,250 ft west of northeast corner El Toro quadrangle; elevation 470 ft. Ditch on south side of Lambert Reservoir. 

Same locality as m18; about 20 ft higher stratigraph- ically. 

21,675 ft south and 5,550 ft west of northeast corner El Toro quadrangle; elevation 1,450 ft. Near head 

of Serrano Creek. 

21,875 ft south and 5,525 ft west of northeast corner El Toro quadrangle; elevation 1,420 ft. Near head 

of Serrano Creek. 

21,950 ft south and 5,525 ft west of northeast corner El Toro quadrangle; elevation 1,410 ft. Near head 

of Serrano Creek. 

19,500 ft south and 10,600 ft west of the northeast corner of the El Toro quadrangle; elevation 1,140 ft. 

Near head of Borrego Canyon. 

22,025 ft south and 5,600 ft west of northeast corner El Toro quadrangle; elevation 1,400 ft. Near head of 

Serrano Creek. 

19,650 ft south and 10,600 ft west of northeast corner El Toro quadrangle; elevation 1,180 ft. Near head of 

Borrego Canyon. 

19,750 ft south and 10,700 ft west of northeast corner El Toro quadrangle; elevation 1,200 ft. Near head of 

Borrego Canyon. 

19,850 ft south and 10,800 ft west of northeast corner El Toro quadrangle; elevation 1,210 ft. Near head of 

Borrego Canyon. 

22,525 ft south and 5,600 ft west of northeast corner El Toro quadrangle; elevation 1,320 ft. Near head of 

Serrano Creek. 

40,600 ft south and 325 ft west of northeast corner of 

the El Toro quadrangle; elevation 980 ft. Between 

Oso Creek and Arroyo Trabuco. 

40,550 ft south and 2,77 5 ft west of northeast corner El Toro quadrangle; elevation 820 ft. Between Oso 

Creek and Arroyo Trabuco. 

12,700 ft south and 2,250 ft west of northeast corner San Juan Capistrano quadrangle; elevation 500 ft. 

In Arroyo Trabuco near junction with Tijeras Canyon. 

33,400 ft south and 775 ft west of northeast corner San Juan Capistrano quadrangle; elevation 580 ft. 

Between Horno Creek and San Juan Creek. 
490 SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY 

Foraminifera localities in the Miocene series, Santa Ana Mountains and San Juan Capistrano area, California-Continued 

No. used in 

this report I USGS I permanent No. 

Field No. Collector Description of locality 

Monterey shale-Continued 

m33 ________ f11445 _____ VIOL ______ J. G. Vedder_ ______________ _ 

m34 ________ f11446 _____ S305 _______ J. E. Schoellhamer __________ _ 

m35 ________ f11447 _____ Y66d ______ R. F. Yerkes _______________ _ 

m36 ________ f11448 _____ S300 _______ J. E. Schoellhamer_ _________ _ 

m37 ________ f11449_ _ _ _ _ S30L ___________ do __________________ - __ 

m38_ _ _ _ _ _ _ _ f11450 _ _ _ _ _ S302 ____________ do __________________ - __ 

m39 ________ f1145L ____ Y69b ______ R. F. Yerkes _______________ _ 

m40__ _ _ _ _ _ _ f11452_ _ _ _ _ B115a_____ _ P. B. Smith ________________ _ 

m4L _______ f11453 _____ VlO ________ J. G. Vedder _______________ _ 

m42 ________ f11454 _____ B115c ______ P. B. Smith ________________ _ 

m43 ________ f11455 _____ V5 _________ J. G. Vedder _______________ _ 

m44 ________ f11456 _____ B115e _______ P. B. Smith ________________ _ 

m45 ________ f11457 _____ B115b __________ do ____________________ _ 

m46 ________ f11458_ _ _ _ _ B116a ___________ do __________ :..----------

m47 ________ f11459 ______ B116b ______ P. B. Smith ________________ _ 

m48 ________ f11460 ______ Vl2 ________ J. G. Vedder _______________ _ 

m49 _________ f1146L _____ B116c ______ P. B. Smith ________________ _ 

m50 ________ f11462 ______ B116d _________ do ______________________ _ 

m5L _______ f11463 ______ V42 ________ J. G. Vedder _______________ _ 

m52 ________ f11464 ______ B116f_ _____ P. B. Smith ________________ _ 

m53 ________ f11465 ______ B116e ___________ do ___ . ________________ _ 

m54 ________ f11466 ______ V43 ________ J. G. Vedder _______________ _ 

m55 ________ f11467 ______ V65 _____________ do ____________________ _ 

m56 ________ f11468 ______ Vl3 _____________ do ____________________ _ 

. 34,400 ft south and 1,025 ft west of northeast corner San Juan Capistrano quadrangle; elevation 420 ft 

Between Horno Creek and San Juan Creek. 

17,200 ft south and 5,300 ft west of northeast corner San Juan Capistrano quadrangle; elevation 460 ft 

West side of Arroyo Trabuco. 

18,100 ft south and 5,450 ft west of northeast corner San Juan Capistrano quadrangle; elevation 480 ft. 

West side Arroyo Trabuco. 

9,875 ft south and 7,425 ft west of northeast corner San Juan Capistrano quadrangle; elevation 465 ft. 

Between Oso Creek and Arroyo Trabuco. 

10,100 ft south and 6,950 ft west of northeast corner San Juan Capistrano quadrangle; elevation 520 ft. 

Between Oso Creek and Arroyo Trabuco. 

11,075 ft south and 6,150 ft west of northeast corner San Juan Capistrano quadrangle; elevation 550 ft 

Between Oso Creek and Arroyo Trabuco. 

32,000 ft south and 4,425 ft west of northeast corner San Juan Capistrano quadrangle; elevation 300 ft. 

Near head of Horno Creek. 

14,175 ft south and 32,500 ft west of northeast corner San Juan Capistrano quadrangle; elevation· 560 ft. 

Near ranch road between Aliso Creek and Nigue 

Road. 

23,150 ft south and 32,650 ft west of .northeast corner San Juan Capistrano quadrangle; elevation 340 ft 

Between Wood Canyon and Aliso Creek. 

14,200 ft south and 31,500 ft west of northeast corner San Juan Capistrano quadrangle; elevation 440 ft 

Near ranch road between Aliso Creek and Nigue 

Road. 

Same locality as m42, but contains a different fauna. 

Stratigraphic relation to m42 is unknown. 

14,800 ft south and 31,250 ft west of northeast corner San Juan Capistrano quadrangle; elevation 390 ft 

Between Aliso Creek and Niguel Road. 

14,100 ft south and 31,800 ft west of northeast corner San Juan Capistrano quadrangle; elevation 480 ft 

Between Aliso Creek and Niguel Road. 

14,850 ft south and 31,075 ft west of northeast corner San Juan Capistrano quadrangle; elevation 380 ft 

Between Aliso Creek and Niguel Road. 

15,100 ft south and 30,875 ft west of northeast corner San Juan Capistrano quadrangle; elevation 360 ft 

Between Aliso Creek and Niguel Road. 

4,800 ft south and 29,375 ft west of northeast corner San Juan Capistrano quadrangle; elevation 360 ft 

On Niguel Road near intersection with U.S. Highway 

101. 

14,975 ft south and 30,350 ft west of northeast corner San Juan Capistrano quadrangle; elevation 420 ft 

Between Niguel Road and Aliso Creek. 

16,025 ft south and 29,250 ft west of northeast corner San Juan Capistrano quadrangle; elevation 340 ft 

Between Niguel Road and Aliso Creek. 

6,175 ft south and 25,425 ft west of northeast corner San Juan Capistrano quadrangle; elevation 350 ft 

Near intersection of Niguel Road and U.S. Highway 

101. 

16,725 ft south, 27,875 ft west of northeast corner San Juan Capistrano quadrangle; elevation 255 ft 

Between Niguel Road and Aliso Creek. 

16,350 ft south and 28,575 ft west of northeast corner San Juan Capistrano quadrangle; elevation 300ft. 

Between Aliso Creek and Niguel Road. 

7,500 ft south and 24,625 ft west of northeast corner San Juan Capistrano quadrangle; elevation 360 ft 

Aliso Creek near U.S. Highway 101. 

21,600 ft south and 27,500 ft west of northeast corner San Juan Capistrano quadrangle; elevation 240 ft. 

East side of Aliso Creek. 

38,400 ft south and 28,900 ft west of northeast corner San Juan Capistrano quadrangle; elevation 460 ft. 

Between Niguel Hill and Arroyo Salada. 
FORAMINIFERA OF MONTEREY SHALE AND PUENTE FORMATION, CALIFORNIA 491 

REFERENCES 

Bandy, 0. L., 1953a, Ecology and paleoecology of some California Foraminifera-Part I. The frequency distribution of 

Recent Foraminifera off California: Jour. Paleontology, 

v. 27, p. 161-182. 

--- 1953b, Ecology and paleoecology of some California 

Foraminifera-Part II. Foraminiferal evidence of subsidence rate in the Ventura Basin: Jour. Paleontology, 

v. 27, p. 20()-203. 

Cushman, .J. A., 1937, A monogravh of the subfamily Virgulininae of the foraminiferal family Buliminidae: Cushman 

La•b. For:uu. Research Spec. Pub. No.9. 

Cushman, .J. A., ·and Galliher, E. ,V., 1934, Additional new Foraminifera from the Miocene of California : Cushman Lab. 

:@oram. Research Contr., v. 10, p. 24-26. 

Cushman, .T. A., and Kleinpell, R. M., 1934, New and unrecorded 

Foraminifera from the California Miocene : Cushman Lab. 

Foram. Research. Contr., v. 10, p. 1-23. 

Cushman, J. A., and Parker, F. L., 1946, Bulimina and related 

foraminiferal genera : U.S. Geol. Survey Prof. Paper 21o-D. 

Kleinpell, R. M., 1938, Miocene stratigraphy of California : Am. 

Assoc. Petroleum Geologists, Tulsa, Okla., 450 p. 

Natland, M. L., 1933, Temperature- and depth-distribution of 

some Recent and fossil Foraminifera in the southern California region: Scrit•PS Inst. Oceanography, Tech. Ser. Bull., 

v. 3, p. 2:!5-230. 

Otto, G. H., 1933, Comparative tests of several methods of 

sampling heavy mineral concentrates: Jour. Sed. Petrology, 

v. 3, p. 3o-39. 

Pierce, R. L., 1956, Mohnian Foraminifera and fish from Benedict Canyon, Sherman Oaks, California: Jour. Paleontology, v. 30, p. 1288-1314. 

Reed, R. D., and Hollister, J. S., 1936, Structural evolution of 

southern California : Am. Assoc. Petroleum Geologists, 

Tulsa, Okla., 157 p. 

Schoellhamer, .J. E., Kinney, D. M., Yerkes, R. F., and Vedder, 

J. G., 1954, Geologic map of the Santa Ana Mountains, 

Orange and Riverside Counties, California: U.S. Geol. Survey Oil and Gas Inv. Ser. Map OM 154. 

Vedder, .J. G., Yerkes, R. F., and Scb:oellhamer, J. E., 1957, Geologic map of the San Joaquin Hills and San Juan Capistrano Area, Orange County, California: U.S. Geol. Survey 

Oil and Gas Inv. Ser. Map OM 193. 

Woodford, A. 0., Schoellhamer, J. E., Vedder, J. G., and Yerkes, 

R. F., 1955, Geology of the Los Angeles Basin: in Calif. Div. 

Mines Bull. 170, chap. 2, p. 65-81. 

Woodring, ·w. P., Bramlette, M. N., and Kew, ·w. S. ,V., 1946, 

Geology and paleontology of Palos Verdes Hills, California: 

U.S. Geol. Survey Prof. Pa;per 207, 145 p. 

Yerkes, R. F., 1957, Volcanic rocks of the El Modeno ·area, 

Orange County, California: U.S. Geol. Survey Prof. Paper 

274-K. 

A Page 

Acknowledgments----------------- 464 

nclvcna, var. Bolivina_____________ 466, 

469, 474, 478, 483} pl. 57 

stria.tclla} Bolivina,____________ 466, 

470,473,474,475,476,483 

nlisoensis} Bolivina simtata________ 369, 

470,472,473,474,475,484 

Anguloye?·i.na ______ 469, 470, 474, 476, 485 

t!nomalina________________________ 488 

8U.z.i1W8CII8i8---------------- 475, 488 Anomalinidae ___________________ 4 77, 4 8 8 

araucana, Valt,ulincria _______ 473, 476, 485 

aur'iculata, Bul·imina -------------- 482 

auris, Nonionina------------------ 481 

B 

Baggina__________________________ 487 

californica ________ 467, 468, 469, 470, 

472, 473, 474, 475, 476, 487 

robusta ---------------------- 486 

barbm·anct} Bolivina _________ 469, 470, 483 

Basin, Los Angeles _________ 464, 467, 478 

Ventura______________________ 478 

Bathysiphon______________________ 477 

bcali, Gristellaria_________________ 481 

H cmicl'istellaria_______________ 466, 

473, 474, 475, 476, 481 

benedictensis, Bolivina_____________ 467 

Bibliography______________________ 491 

bicostata, Bolivina costata._________ 483 

Bolivina interj1mcta ---------- 469, 

470, 472, 473, 488 Bolivina _______________ 468, 469, 477, 488 

advena var·------------------ 466, 

469,474,478, 483,pl. 57 

stri.atella_________________ 466. 

470, 473, 474, 475, 476, 483 

barbarana ______________ 469, 470, 48S 

benedictensis ----------------- 461 

bramletteL------------------- 468 

brevior ________ 469, 472, 474, 475, 488 

californica _____ 468, 469, 472, 475, 488 

costata bicostata______________ 483 

clecurtata _____________ 467, 468, 469, 

470, 472, 474, 475, 483, pl. 57 

decussata ------------------ 476, 488 girardensis_ ____________ 468, 469, 488 

hoots'----------------------- 468 

hughes'-------------------- 467, 468 

hughesi, faunal zone _________ 467, 468 

imbricata __________ 466, 475, 476, 488 

interjuncta bicostata__________ 469, 

470, 472, 473, 488 

marginata gracilis ------------ 483 

gracillima________________ 469, 

470,472,474,475,476,488 

mocleloensis ________ 467, 468, 469, 484 

faunal zone _____________ 467, 468 

obliqua ________________ 469, 470, 484 

pisciformiB------------- 474, 476, 484 

pBC1tdospissa------------------ 469, 

470,472,473,474,484 

rankini_ __ 470, 472, 473, 474, 476, 484 

rhomboidaliB----- 475, 476, 484, pl. 57 

salinasensiB------------ 469, 475, 484 smninuda __________________ 472, 484 

sinuata alisocnis______________ 469, 

470, 472, 473, 474, 475, 484 

spissa ----------------------- 478 

INDEX 

[Italic numbers indicate catalog mention] 

Bolivina-Continued Page 

su.badvena _________ 469, 475, 476, 484 

subhughesi.,. _________ 469, 484> pl. 57 

tumicla_ 469, 470, 472, 474, 475, 476, 484 

vaughani--------.------ 469, 470, 472, 

473, 474, 475, 476, 484} pl. 58 

woml.ringi_ ________________ 467, 469, 

470, 472, 474, 475, 485} pl. 57 

bramlettei, Boli'l:ina_______________ 468 

Breccia, San Onofre _____________ 464, 478 

brcvior, Bolivina ____ 469, 472, 474, 475, 483 

Bulimina __________________ 469, 477, 482 

a.uriculata ------------------- 482 

ca.rncrosensis_ 472, 474, 476, 482} pl. 58 

mahonyi_________________ 482 

delreyensis _________________ 469, 482 

montereya.na ----------------- 466, 

469, 472, 475, 476, 482 

ovula _________ 472, 474, 475, 476, 482 

pseudoatflnis _____ 469, 472, 482, pl. 57 

pseudotorta ------------------ 466 

pupoidcs------------------- 475, 482 

rostrata -·-------------------- 478 

subacuminata_________________ 478 

uvigerinaformiB------------ 467, 468, 

469, 470, 472, 473, 476, 482 

faunal zone ____ 467, 468, 473, 476 

(Desinobulimina) ----------- 472, 482 

Buliminella_______________________ 481 

curta _____________________ 469, 470, 

472, 473, 474, 475, 476, 481 

ecnadorana___________________ 469, 

470, 474, 476, 481} pl. 58 

elegantissima ___________ 472, 480, 481 

equadorana___________________ 473 

subfusiformis __________ 469, 470, 472, 

474, 475, 476, 478, 480, 482 

Buliminidae ________________ 467, 477, 481 

bulloicZes} Globigerina_. ______ _469, 470, 472, 

473, 474, 475, 476, 480, 488 

Burruel Ridge __________ 464, 466, 468, 478 

c 

californica, Baggina ____ 467, 468, 469, 470, 

472, 473, 474, 475, 476, 481 

Bolivina _______ 468, 469, 472, 475, 483 

gracilis, Uvigerinella__________ 485 

obesa} Valvulineria--------- 468, 469, 

470, 473, 474, 475, 476, 486 Uvigerinella ________________ 466, 470, 

472, 473, 474, 475, 476, 485 

VahJttlineria__________________ 466, 

472,47~ 47~ 48~ pl. 59 

Virg~tlina -------------------- 469, 

470,472,474,475,476,482 

grandis} Virgulina ___________ 476, 482 

Gancris__________________________ 481 

baggi_ _________________ 475, 476, 487 

Capistrano formation ________ 466, 472, 480 

syncline-------------------- 466, 478 

carnerosensis, Buli-mina____________ 472, 

474, 476, 482} pl. 58 

-ma.honyi, Bulimina____________ 482 

Gassitl1tlina -------------------- 470, 481 

cushmnnL _____ 469, 472, 474, 476, 481 

li'tnbata ____________________ 470, 487 

margareta __________________ 470, 481 

Ca8sidnlina-Continm~l1 Page 

pa.nza.na. _______________ 473, 474, 481 

translucens ·--·---------------- 487 williamL ___________________ 475, 481 

Gassiclttlinella. renulinajonnis_______ 464 

Cassidulinidae____________________ 487 

Chilostomellidae ------------------ 488 Gibicicles_, ______________________ 470, 488 

illingi. _________ 470, 472, 473, 476, 488 

collond, Siphogenerina ___________ 466, 472, 

473, 474, 475, 476, 478, 485 Conclusions _____________________ 478-480 

Concretions, calcareous____________ 468 

Correlation of formations and stages_ 478 

costate£ bicosta.ta, Bolivina_________ 483 

costifera} Nonionina -------------- 481 

costijeru.m} Nonion________________ 464, 

466, 468, 469, 470, 472, 473, 

474, 475, 476, 478, 481} pl. 58 

Gt·istella'l'ia bea.Zi__________________ 481 

miocenica____________________ 480 

curta.} B·uz.iminella ______________ 469, 470, 

472, 473, 474, 475, 476, 481 

cnshma.ni} Gassu.dulina ------------ 469, 

472, 474, 476, 487 

D 

fl.ceurtnta.} Bolivina _________ 467, 468, 469, 

470, 472, 474, 475, 483, pl. 57 

dccnssa.ta.} Bolivina. ______________ 476, 483 

Delmontian stage_________________ 466 

delreyensis} Bulimina ____________ 469, 482 

Dentalina------------------------ 481 obZiqua ________ 473, 474, 475, 476, 481 

clepressa, Va.lvulineria. _______ 466, 469, 473, 

474, 475, 476, 478, 486} pl. 59 

(Desinobulimina.), Bttliminn ______ 472, 482 

Discorbinellct --------------------- 488 vnlmonteensis ______________ 475, 488 

E 

ecuadorana, Buliminella ----------- 469, 

470, 474, 476, 481} pl. 58 

El M:odeno volcanics-------- 464, 468, 4 78 

El Toro Air Station------------- 465,466 

elegnntissi·ma} Buliminella ___ 472, 480, 481 

Hpistominella ___________________ 469, 487 

eva.x ------------------------ 487 

gyroiclinatormis ________ 467, 468, 469, 

470, 472, 473, 474, 476, 481 

pa-cifica. ______ 470, 473, 478, 487> pl. 58 

reZizensiB------------------ 469, 470, 

472, 473, 474, 475, 476, 487 

subpentviana ______________ 470, 472, 

473, 474, 475, 476, 480, 487 

tha.lmanni. ___________ 474, 487, pl. 58 

Eponitles_________________________ 481 

rosajormis ------------------- 468, 

469, 472, 473, 474, 475, 487 

eqna(lor·a.na} Buliminclla. ----------- 469, 

470, 473, 474, 476, 481} pl. 58 

evax, Epistiminella --------------- 487 

F 

Fault, Cristianitos ______________ 466, 472 

Faunal summary ________________ 476-477 

Faunas ________________________ 466-468 

molluscan____________________ 464 

493 
494 

G Page 

Geographic divisions _____________ 468-476 

Geology ________________________ 464-466 

giranlcnsis, Bolivina ________ 468, 469, 483 

Globigerina ---------------------- 488 

bulloides ------------------ 469, 470, 

472, 473, 474, 475, 476, 488 

Globigerinidae____________________ 488 

globula, Pullenia miocenica_________ 474, 

475, 476, 488 

gracilis, Bolivina. marginata________ 483 

Uvigerinella californica ________ . 485 

gracillima, Bolivina marginata______ 469, 

470, 472, 474, 475, 476, 483 

grandis, Valvulineria-------------- 468, 

469,47~472, 48~ pL 59 

Virgulina californiensis ______ 476, 482 

Gyroidinn ______________________ 469, 486 

rotundimargo _____ 469, 470, 472, 473, 

474, 475, 476, 480, 486, pl. 59 

solclanii rotunflimargo --------- 486 

!J!Jroidinaformis, EtJistominella______ 467, 

468, 469, 470, 472, 473, 474, 

476, 487. 

Pulvinulinella ---------------- 487 

H 

H etnicristcllaria___________________ 4 81 

beau ______ 466, 473, 474, 475, 476, 481 

hootsi, Bolivina___________________ 468 

Uvigerina _____ 472, 473, 474, 476, 485 

Hopl;,insina _________________________ 48 5 

magnifica __________________ 469, 485 

hu.ghesi, Bolivina--------------- 467, 468 

I 

illi.ngi, Oibicides_ ___ 460, 472, 473, 476, 488 

imbricata, Bolivina ______ 466, 475, 476, 483 

interjuncta bicostata, Bolivina______ 469, 

470,472,473,483 

Introduction --------------------- 463 

Irvine Lake ____________________ 465, 466 

J 

joaquinensis, Uvigerina____________ 469, 

470, 472, 485, pl. 57 

K 

Kleinpell, R. l\:1., quoted____________ 466 

kleinpelli, Suggrunda ___________ 469, 470, 

472, 473, 474, 475, 476, 485 

L 

La Vida member of Puente formation _______ 464, 465, 466, 468 

Lagenidae _________________ 467, 477, 480 

Laguna Beach____________________ 464 

limbata, 0(tssidulina _____________ 470, 487 

Localities, Foraminifera--------- 488-490 

Location of test wells and core holes_ 463 

luciana, Plnnularia ______________ 475, 481 

Luisian stage ______________ 466, 468, 470, 

472, 473, 476, 477, 478, 480 

M 

magnifica, Hopkinsina ___________ 469, 485 

mahonyi, Bulimina carnerosensis____ 482 

nHtrf}nreta, Oassidulina __________ 470, 487 

mnrgina.tn gracilis, Bolivina________ 483 

yrncillimn, Bolivina___________ 469, 

470, 472, 474, 475, 476, 483 

Miliolidae________________________ 477 

Miliolids_________________________ 477 

mioccnica, Oristellaria_____________ 480 

globnln, Pullenia, ___ 474, 475, 476, 488 

Nonionella ____ 469, 472, 475, 480, 481 

Pullenia ------------------- 475; 488 

Valvu.lincria__________________ 4 72, 

473, 474, 475, 476, 486, pl. 59 

INDEX 

Page 

mioccnicus, Robulus_ ____________ 473, 4 80 

modeloensis, Bolivina ___ 467, 468, 46·9, 484 

Mohnian stage _____ 464, 466, 467, 468, 470, 

472, 473, 476, 477, 478, 480 

Monterey shale ________________ 464, 466. 

470, 472, 473-, 476, 478, 480 

montereynna, Bulimina____________ 466, 

469, 472, 475, 496, 482 

N 

Nautilus obliqu.us_________________ 481 

Nodosaria________________________ 476 

Nonion ________________________ 47~ 481 

costifernm____________________ 464, 

466, 468, 469, 470, 472., 473, 

474, 475, 476, 478, 481, pl. 58 

piza.rrensis.:.______________ 469, 481 

pompilioides__________________ 478 

Nonionella ------------------------- 481 

miocenica _____ 469, 472, 475, 480, 481 

Nonionidae_______________________ 481 

Nonionina a.uri.~ ------------------ 481 

costi(era_____________________ 481 

nucijormis, Siphogeneri-na ________ 466, 485 

0 

obesa, Valvttlineria californica ___ 468, 469, 

470, 473, 474, 475, 476, 486 

.Obliqna, Boli.l:ina __________ 469, 470, 484 

Dentalina. _____ 473, 474, 475, 476, 481 

obliquus, Naut·ilus ---------------- 481 

ocoyana, Tttrritella________________ 468 

ornata, Planulina_________________ 469, 

47~ 472, 473, 48~ 488 

Truncatulina ------------.----- 488 

Valvulineria ________________ 4,76, 486 

Oso Creek _____ 468, 470, 473, 476, 478, 480 

ovrtla, Bulimina ____ 472, 474, 475, 476, 482 

p 

pacifica, Epistominella_____________ 470, 

473, 478, 481, pl. 58 

PttlvinuZinella ---------------- 487 

Pnlmerinella thalmanni____________ 487 

Palos Verdes Hills _____________ .___ 477 

panzana, Oa.ssidulina _______ 473, 474, 487 

perc,qrina., U·r;i,qcrina_______________ 478 

pisci(ormis, Bolivina ________ 474, 476, 484 

tJizarrcnsi.<t, Nonion ______________ 469, 481 

Plan.ularia ----------------------- 4 81 luciana ____________________ 475, 481 

Planulina ----------------------- 488 

ornata ____ 469, 470, 472, 473, 480, 488 

pompilioide.<t, Nonion -------------- 478 

Previous work____________________ 464 

p.<teuclonffinis, Rnliminn ------------ 469, 

472, 482, pl. 57 

pserl.dospi.<tsa, Bolivina._____________ 469, 

470, 472, 473, 474, 484 

Pseruloparclla tha.lmamni. ---------- 487 

p8cudotorta, Bnliminn______________ 466 

Puente formation _______ 464, 466, 468, 480 

Pullenia ------------------------- 488 miocenicn __________________ 475, 488 

globu.ln _______ 474, 475, 476, 488 

Pnlvinulinelln gyroidina,fot·mis______ 487 

pacifi.ca______________________ 487 

reli.~ensis_____________________ 487 

8ttbperuviana ----------------- 487 

pu,poides, Bulimina. ______________ 475, 482 

R 

rnnkini, Bolivina__________________ 470, 

472, 473, 474, 476, 484 

reedf, SiphorJencrina._______________ 466, 

473,476,478,480 

reli:::cn8iN, Epistominclla _________ 46!), 470. 

472, 473, 474, 475, 476, 487 

Pulvinulinella ---------------- 487 

Page Relizian stage ______________ 466 468 478 

renulina(ormis, Oassi(lulinella ---~-- ' 464 

rhomboidalis, Bolivina_ 474, 476, 484, pl. 57 

Textularia------------------- 484 

Robultts ------------------------- 4 80 miocenicus_ ________________ 473, 480 

simplex ____________________ 475, 481 

smileyi_ ___ 470, 473, 474, 475, 476, 481 

robusta, Baggina ----------------- 486 

rosaformis, Eponides______________ 468, 

469, 472, 473, 474, 475, 487 

rostratn, Bulimina________________ 478 

Rotaliidae _____________________ 467, 485 

rotundim.nrgo, Gyroideina__________ 469, 

470, 472, 473, 474, 475, 476, 

480, 486, pl. 59. 

soldanii__________________ 486 

s 

snli1wsensis, Anoma.lina __________ 475, 488 

Bolivina _______________ 469, 475, 484 

Samples, preparation oL___________ 464 

San .Joaquin Hills ______ 464, 466, 478, 480 

Santa Ana River_________________ 468 

Santa Monica Mountains__________ 468 

Saucesian stage___________________ 466 

scintillans, Vttlvulineria ----------- 486 

seminuda, Bolivina ______________ 472, 484 

simplex, Robttlus ________________ 475, 481 

sinuata alisoensis, Bolivina________ 469, 

470,472,473,474,475,484 

SiphorJenerina __________ 466, 477, 480, 485 

collomi_ ___________________ 466, 472, 

473, 474, 475, 476, 478, 485 

faunal zone_ 466, 472, 473, 47'6, 478 

nttcijormis _________________ 466, 485 

faunal zone -------------- 460 

reedi---------- 466, 473, 476, 478, 480 

faunal zone______________ 466, 

473, 476, 478, 480 

smileyi, Robulus__________________ 470, 

473,474,475,476,481 

soldanii rotundimargo, Gyroidina___ 486 

Soquel member of Puente formation_ 464, 

465, 468 

spissa, Bolivina___________________ 478 

Stages, Miocene foraminiferaL ____ 466-468 

Stratigraphy ____________________ 464-466 

striatelln, Bolivina. advenn_________ 466, 

470,473,474,475,476,483 

Structure------------------------ 466 

subacuminata, Bul·imina ____ "'"------ 478 

subadvena, Bolivina _____ 469, 475, 476, 484 

sub(usi(ormis, Buliminella ___ 469, 470, 472, 

474, 475, 476, 478, 480, 482 

subhughesi, Bolivina ______ 469, 484, pl. 57 

subperegrina, Uvigerina _________ 469, 470, 

472, 473, 474, 475, 476, 485 

Epistiminella -------------- 470, 472; 

473, 474, 475, 476, 480, 487 

Pulvinttlinella ---------------- 487 

Su.ggrunda ----------------------- 485 kleinpellL _________________ 469, 470, 

472, 473, 474, 475, 476, 485 

Sycamore Canyon member of Puente 

formation __________ 465, 468 

Syncline south of Irving Lake______ 465 

Systematic catalog -------------- 480-488 

T 

Textttlal'ia rhomboida.li.L___________ 484 

tha.lmanni, Epistominella ___ 474, 487, pl. 58 

Palmerinella__________________ 4 87 

Pseudoparella ___________________ 487 

Topanga formation_ 464, 466, 468, 472, 478 

translucens, Oassidttlina ----------- 487 

Tru.ncatulina ornata_______________ 488 

tumida, Bolivina__________________ 469, 

47~ 472,474,475,476,484 

Turritella ocoyana________________ 468 
U Page 

Unconformities------------------- 478 

U·uigeri•IH£ ------------------------ 485 

costate---------------------- 480 

hootsi_ ________ 472, 473 .• 474, 476, 485 

jonqu.inen.~is __ 469, 470, 472, 485, pl. 57 

percyrina -------------------- 478 

8Ub1JC1'C[J1'i'!U£ _______________ 4()9, 470, 

472, 473, 474, 475, 476, 485 

tn;igeri1Ht.(ormi.~, Bu.Umi.na. ________ 467, 468, 

469, 470, 472, 473, 476, 482 

U·t)i.yerinclln ---------------------- 485 C(tlifornica. _________________ 466, 470, 

472, 473, 474, 475, 476, 485 

graci.li.s ------------------ 485 

v 

linlm.ontccns·is, Discorbimclln ______ 475, 488 

INDEX 

Page 

l'nlvnlincria _______ 468, 476, 477, 480, 485 

nrnucann ______________ 473, 476, 485 

cnlifornica____________ ------ 466, 

472,473,475, 48~pl. 59 

obesn ----------------- 468, 469, 

470, 473, 474, 475, 476, 486 

tleprcssa ______________ 466, 469, 473, 

474, 475, 476, 478, 486, pl. 59 

ynmtlis__ 468, 469, 470, 472, 486, pl. 59 

miocenica____________________ 472, 

473,474,475,476, 48~pl. 5~ 

ornata _____________________ 476, 486 

scintilla.ns ____________________ . 486 

wUUami ------------------- 470, 486 

va.ug1wni, BoUvinn ___ ,.. _____ 469, 470, 472, 

473, 474, 475, 476, 484, pl. 58 

0 

495 

.Page 

Virgulina ------------------------ 482 californiensis_________________ 469, 

470,472,474,475,476,482 

gra.n(lis ________________ 476, 482 

w 

1oilliami, Cassid.ulina ____________ 475, 487 

Valvttlineria. ________________ 470, 486 

woodrtngi, Bolivina. _____________ 467, 469, 

470, 472, 474, 475, 485, pl. 57 

y 

Yorba member of Puente formation__ 465, 

468 

z 

Zemorrian stage _________________ _ 466 
PLATES 57-59 
PLATE 57 

FIGURES 1, 2. Uvigerina joaqt1,inensis Cushman and Kleinpell (p. 485). 

1. Apertural view, slightly oblique. 2. Side view. X140. USNM 624900. 

3, 4. BoUv·ina. aavena Cushman var. ( p. 483). 

3. Apertural view. 4. Side view. X186. USNM 624860. 

5, 6. B olivi·na dcczwta t a Cushman ( p. 483) . 

5. Apertural view. 6. Side view. X140. USNM 624881. 

7, 8. Bttlimina cf. B. psezuloaf{inis Kleinpell (p. 482). 

7. Apertural view. 8. Side view. X140. USNM 624848. 

9, 10. Bolivina cf. B. woot1rin.gi Kleinpell (p. 485). 

· 9. Apertural view. 10. Side view. X186. USNM 624891. 

11, 12. Bolivina cf. B. sttbhughesi Kleinpell (p. 484). 

11. Apertural view. 12. Side view. X186. USNM 624886. 

13, 14. Bolivinacf. B. rhorn.boidalis (Millett) (p. 484). 

13. Apertural view. 14. Side view. X186. USNM 624875. 
GEOLOGICAL SURVEY PROFESSIONAL PAPER 294 PLATE 57 

FORAMINIFERA OF THE MONTEREY SHALE AND PUENTE FORMATION 
PLATE 58 

FIGURES 1, 2. Buliminella ecuadorana. Cushman and Stevenson (p. 481). 

1. Apertural view. 2. Side view. X140. USNM 548920. 

3, 4. BuUmi.na carnC'rosensis Cushman and Kleinpell (p. 482). 

3. Apertural view. 4. Side view. X186. USNM 624852. 

5, 6. ponion aff. N. costi.ferum (Cushman) (p. 481). 

5. Side view. 6. Peripheral view. X186. USNM 548915. 

7, 8. Bolivina cf. B. 1.iU11fJ1/a.ni Natland (p. 484). 

7. Apertural view. 8. Side view. X186. USNM 624889. 

9-11. EtJistominella. tha.lnwnn.i ( Stainforth and Stevenson) (p. 487). 

9, 11. Side views. 10. Peripheral view. X186. USNM 624843. 

12-14. Epistominella. pacifica (R. E. and K. C. Stewart) (p. 487). 

12, 14. Side views. 13. Peripheral view. X186. USNM 624921. 
GEOLOGICAL SURVEY PROFESSIONAL PAPER 294 PLATE 58 

FORAMINIFERA OF THE MONTEREY SHALE AND PUENTE FORMATION 
PLATE 59 

FIGURES 1-3. Gyroidina rotmulimarrto R. I<~. and K. C. Stewart (p. 486). 

1, 3. Side views. 2. Peripheral view. X186. USNl\f 624912. 

4-6. Valvulineria californica, Cushman ( p. 486). 

4, 6. Side views. 5. Peripheral view. X70. USNl\f 624905. 

7-9. Valmtline1·ia miocenica Cushman ( p. 486) . 

7, 9. Side views. 8. Peripheral view. X70. USNl\i 624909. 

10-12. Falvulineri(t (lepressa Cushman (p. 486). 

10, 12. Side views. 11. Peripheral view. X70. USNM 624907. 

13-15. llalvltlineria cf. F. gran{tis Cushman and Galliher (p. 486). 

13, 15. Side views. 14. Peripheral view. X70. USNl\1 624917. 
GEOLOGICAL SURVEY PROFESSIONAL PAPER 294 PLATE 59 

FORAMINIFERA OF THE MONTEREY SHALE AND PUENTE FORMATION