Stratigraphic Distribution 

of Some Pennsylvanian 

Fusulinidae from Brown and 

Coleman Counties, Texas

GEOLOGICAL SURVEY PROFESSIONAL PAPER 315-C

Prepared in cooperation with the Bureau

of Economic Geolovy, The University of Texas
Stratigraphic Distribution 

of Some Pennsylvanian 

Fusulinidae from Brown and 

Coleman Counties, Texas

By DONALD A. MYERS

PENNSYLVANIAN AND LOWER PERMIAN ROCKS OF 

PARTS OF WEST AND CENTRAL TEXAS

GEOLOGICAL SURVEY PROFESSIONAL PAPER 315-C

Prepared in cooperation with the Bureau

of Economic Geology, The University of Texas

UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1960
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 45 cents (paper cover)
CONTENTS

Abstract- _________------____----------_--_---------

Introduction _______-_---____-___-__----__---__-----

Location of the area_______ _________________ _____

Previous investigations __________________________

Methods of study. - _____________________________

Acknowledgments,.-. _ __________________________

Stratigraphy ______.______-________-______----___-_-

Stratigraphic distribution of the fusulinids_ ____________

Strawn group undiflferentiated. ___________________

Ricker Station limestone of Cheney (1949)__._. 

Capps limestone lentil of Plummer and Moore

Canyon group- - _______________________

Graf ord formation __________________

Brown wood shale member _______

Adams Branch limestone member. 

Cedarton shale member__________

Winchell limestone__ _ _______________

Brad formation. __ _._--______-_-____

Placid shale member ____________

Ranger limestone member _______

Page 

37

37

38

38

38

40

42

42

42

42

42

42

43

43

43

43

43

43

44

44

Stratigraphic distribution of the fusulinids Continued

Canyon group Continued Page

Caddo Creek formation...--------------..--- 44

Colony Creek shale member.._-___.-_____ 44

Home Creek limestone member._________ 44

Cisco group_______-----___-----_--------------- 44

Graham formation.____________---_----__--_ 44

Bluff Creek shale member.__._._-__._____ 45

Gunsight limestone member._____________ 45

Wayland shale member._________________ 45

Ivan limestone member___ _-___-_-_-____ 46

Shale overlying the Ivan limestone member. 46

Thrifty formation______-_______ ______-___-_- 46

Speck Mountain limestone member _______ 46

Breckenridge limestone member__________ 46

Interval between the Breckenridge and

Chaffin limestone members._________._- 46

Chaffin limestone member-____.________- 46

Summary __ _____._-_______.___._-___-_-___---._____ 47

Collecting localities _________________________________ 47

References.-_____.__._____.____^__________________- 51

Index. ____________________________________________ 53

ILLUSTRATIONS

[Plates 15-24 follow index]

PLATE 15. Fusulinidae from the Strawn group undifferentiated

16. Fusulinidae from the Graford formation

17. Fusulinidae from the Winchell, Brad, and Caddo Creek formations

18. Fusulinidae from the Bluff Creek shale member of the Graham formation

19. Fusulinidae from the Gunsight limestone member of the Graham formation

20. Fusulinidae from the Wayland shale member of the Graham formation

21. Fusulinidae from the Ivan limestone member of the Graham formation

22. Fusulinidae from the Speck Mountain and Breckenridge members of the Thrifty formation

23. Fusulinidae from the Chaffin limestone member of the Thrifty formation

24. Miscellaneous Fusulinidae from the Pennsylvanian of Brown and Coleman Counties, Texas

FIGURE 9. Index map of Brown and Coleman Counties, Texas.._______.._.____._-_--_-___________-_-______-__.___

10. Generalized columnar section of the Pennsylvanian rock that crop out in Brown and Coleman Counties, Texas

Pag? 

30 

41

TABLE

TABLE 1. Distribution of Fusulinidae in the Strawn, Canyon, and Cisco groups in Brown and Coleman Counties, Texas_

Pag-e 

40

PENNSYLVANIAN AND LOWER PERMIAN ROCKS OF PARTS OF WEST AND CENTRAL TEXAS

STRATIGRAPHIC DISTRIBUTION OF SOME PENNSYLVANIAN FUSULINIDAE 

FROM BROWN AND COLEMAN COUNTIES, TEXAS

By DONALD A. MYERS

ABSTRACT

The stratigraphic succession of Pennsylvania!! rocks that 

crop out in Brown and Coleman Counties contains oil and gas 

in the subsurface in central Texas and is equivalent to rocks 

that contain large reservoirs of petroleum in western Texas.

The Pennsylvaiiiaii rocks that crop out in Brown and Coleman 

Counties include the upper pai't of the zone of Fitsulina, represented in the Strawn group undifferentiated, and the zone of 

Triticites, represented in the rocks of the Canyon and Cisco 

groups. The zone of Triticites extends upward into the Wichita 

group of Permian age. The fusuliuid faunas are abundant and 

varied. Within the zone of Triticites each limestone bed or 

group of limestone beds contains a distinctive assemblage of 

fusuliiiids. The genus Triticites exhibits a general evolutionary 

series embracing the small thin-walled and relatively simple 

species in the lower part of the Canyon group, and the large 

veiitricose thick-walled species in the upper part of the Cisco 

group. The gradation between species is believed to proceed 

at a more or less uniform rate, and by comparing evolutionary 

stages it is possible to make correlations of the containing rock 

units.

INTRODUCTION

In recent years the study of fusulinids has become 

increasingly important because of the large amounts of 

oil and gas produced from rocks belonging to the Peniisylvanian and Permian systems. The fossils belonging 

to the family Fusulinidae have widespread geographic 

distribution and generally are found in considerable 

abundance in rocks of these systems. They first appeared in Late Mississippian time. The fusulinids 

flourished during Pennsylvaiiiaii and most of Permian 

time and became extinct slightly before the end of the 

Permian period. Within this timespan, evolutionary 

changes were continuous and great. The widespread 

geographic distribution, the great abundance of specimens, and the rapid evolution within the family, serve 

to make the genera and species of fusulinids valuable 

for correlating the rock units that contain them.

Use of fusulinids as a stratigraphic tool depends upon 

knowledge of their distribution in time. This, in turn, 

depends upon knowledge of the stratigraphic sequence 

of the rocks in areas from which fusulinid collections 

have been made. D. Hoye Eargle (1960) has recently studied and described the stratigraphic succession of Pennsylvania!! and lower Permian rocks in 

Brown and Coleman Counties. His nomenclature, used 

throughout this report, provides a convenient frame of 

reference for the description of the stratigraphic distribution of the fusulinids. Recent detailed geologic, 

mapping by the U.S. Geological Survey has provided 

information on the lateral continuity of lithologic units 

in the Pennsylvaiiiaii and lower Permian sequence, and 

has made it possible to obtain abundant collections of 

fusulinids from precisely defined positions in the stratigraphic sequence.

Much of the stratigraphic correlation in the Permian 

basin of western Texas and elsewhere in areas of Pennsylvaiiiaii and Permian rocks is based on age relations 

determined by the study of fusulinids. In some of the 

limestone masses, such as the subsurface Horseshoe 

Atoll in the Midland basin of western Texas, correlation of rock units is largely dependent upon faunal 

evidence. Because fusulinids are small enough to b3 

preserved intact in well cores and as identifiable fragments in cuttings, they provide an excellent tool to aid 

in determining the stratigraphic succession within til*} 

atoll (Myers, Stafford, and Burnside, 1956). Knowledge of the stratigraphic distribution of the various 

genera and species of fusulinids in the atoll was derived 

from studies of their distribution in the Pennsylvania!! 

and lower Permian rocks that crop out in central and 

western Texas.

The rocks that crop out in the area of this report 

have been assigned to the Strawn, Canyon, and Cisco 

groups of Pennsylvania!! age and to the Wichita group 

of Permian age. Fusulinids have been found in most 

of the limestone beds and in a few of the shale beds 

in this rock sequence. The zone of Fusulina is in thQ, 

Strawn group, and the zone of Triticites is in the Can - 

yon and Cisco groups and extends upward into th°* 

Wichita group. The fusulinid faunas in these rocks 

are abundant and varied.

37
38 PENNSYLVANIAN AND LOWER PERMIAN ROCKS, WEST AND CENTRAL TEXAS

Collections of fusulinids were made during 1949-55 

from several hundred localities in Brown and Coleman 

Counties. Only material of undoubted stratigraphic 

position was used. Specimens of fusulinids were prepared by standard methods. Typical and unusual 

fusulinids from each locality are illustrated in this report and indexed to appropriate positions on a generalized columnar section. Unnamed species, or those 

with uncertain affinities, are designated by letters.

The gradation between species is the factor that 

makes the fusulinids a valuable tool in correlation of 

rock units. This gradation often represents a continuous evolutionary series and therefore the line of demarcation between species, and between genera in some 

cases, can be vague. Many features of the fusulinid 

which exhibit change have been found to be constant at 

any given stratigraphic horizon.

This report describes and illustrates the characteristics and stratigraphic distribution of fusulinids in the 

rocks of Pennsylvania!! age in Brown and Coleman 

Counties. The taxonomic descriptions of these fusulinid faunas are the subject of a detailed study, now in 

progress, of the Fusulinidae of north-central Texas by 

Lloyd G. Henbest, Donald A. Myers, and Raymond 

C. Douglass.

The morphologic principles upon which the taxonomic differentiation in this report is based are outlined 

by Dunbar and Henbest (1942, p. 35-56, fig. 5-8) and 

by Thompson (1948, p. 8-22, fig. 1-4).

LOCATION OF THE AREA

The area lies entirely within the Colorado River 

drainage basin in central Texas. It is bounded to the 

north by the Brown-Eastlancl County line, to the south 

by the Colorado River, to the east by the western edge 

of the overlapping Cretaceous rocks in Brown County, 

and to the west by the base of the Permian Waldrip 

shale member of the Pueblo formation in southeastern 

Coleman and northwestern Brown Counties, which is 

the line shown as the contact between the Cisco and 

Wolf camp (fig. 9).

PREVIOUS INVESTIGATIONS

Little information has been published on the fusulinids from rocks of the Canyon and Cisco groups. Dunbar and Condra (1928) described several species from 

the Graham formation in the Brazos River drainage 

basin, north of the area of this report. M. P. White 

(1932) described and illustrated several species of fusulinids from central Texas, and briefly discussed the 

stratigraphic. distribution of the species; his report, 

however, is mainly concerned with taxonomy. Henbest 

(Lee and others, 1938) published some notes on the

ranges and species of fusulinids in the Cisco group in 

the Brazos River drainage basin. Thompson (1945, 

p. 452, pi. 1, fig. 5; pi. 2, figs. 11-18) described a 

fusulinid from the Ricker Station limestone of Cheney 

(1949), which crops out in the area of tl is report. 

Stewart (1958) described several fusulinid? from the 

upper part of the Strawn group in Texas, including 

some from the area of this report. Henb^st's notes 

constitute the only published report relating the fusulinid fauna to the stratigraphic sequence in the upper 

part of the Pennsylvania!! system of central Texas.

METHODS OF STUDY

All fusulinid-bearing rock units of the Pennsylvanian system in Brown and Coleman Counties Tex., are 

represented in the fossil collections that were studied 

for this report. Several hundred collections were made, 

generally in conjunction with geologic mapping, and 

the locations of the more important collections are 

shown on figure 9. Most of the fossiliferous material 

was taken from rock in place, but a few collections 

were made from anthills so situated that there was no 

possibility of contamination from other rocl' units.

Most of the fusulinids illustrated in this report were 

taken from blocks of limestone. The blocks v^ere sawed 

into slabs about a quarter of an inch thick, generally 

parallel to the bedding. These slabs were immersed 

in water and examined with a binocular microscope. 

From each locality, 40 to 50 representative fusulinids 

were selected and marked for cutting. In the process 

of selection, the specimens of each type of fusulinid 

whose long axis was most nearly parallel to the cut 

surface were used. The marked specimens were cut 

from the rock, leaving matrix around the specimen 

equal to or greater than the diameter of the fusulinid. 

The resulting chips of limestone were completed as thin 

sections in the manner described by Dunbar and Henbest (1942, p. 65-74). More than* 6,000 oriented thin 

sections were prepared and examined between 1950 and 

1955.

Twenty or more oriented axial thin sections were prepared for each locality, and care was taken to obtain a 

representative suite of fossils. Representative and unusual fusulinids were selected from each prepared collection and were photographed with transmitted light 

at a standard magnification of X 10- Small fusulinids, 

such as ScliuberteUa and fitaffeHat, were photographed 

at a magnification of X 30. These photographs were 

mounted in a looseleaf binder, containing no more than 

one locality to a page, in stratigraphic sequence. This 

method provides a ready reference to the collections of 

prepared fusulinids. The fusulinids illustrated in this 

report (pis. 15 through 24) were selected from this file.
STRATIGRAPHIC DISTRIBUTION OF PENNSYLVANIAN FUSULINIDAE FROM TEXAS

FIGCRB 9. Index map of Brown and Coleman Counties, Tex., showing location of fusulinid collections and approximate contacts

stratigraphic units in the Pennsylvanian system.
40 PENNSYLVANIAN AND LOWER PERMIAN ROCKS, WEST AND CENTRAL TEXAS

These fusulinid illustrations are keyed to a generalized 

columnar section, (fig. 10), and the stratigraphic distribution of the fusulinid faunas are summarized in a 

check list (table 1).

, ACKNOWLEDGMENTS

The stratigraphic nomenclature used in this report is 

the revised terminology prepared by D. Hoye Eargle

Brown and Coleman Counties by Eargle, Philip T. 

Stafford, Robert T. Terriere, and the writer, from 1949- 

55. The stratigraphic study of fusulinids in the Pennsylvanian strata of Texas was begun by Keith A. 

Yenne, and much of the material prepared fo" him has 

been used by the writer. Yvonne M. Kahanek and Patricia A. Black prepared most of the specimens and as-

(1960), which is based on geologic mapping in sisted with the photography.

TABLE 1. Distribution of Fusulinidae in the Strawn, Canyon, and Cisco groups in Brown and Coleman Counties, Texas 

[Cf. is used where the fossil is very similar to the named species; at most the difference is subspeciflc]

Group, formation, and member

Cisco 

Thrifty:

Graham:

Canyon 

Caddo Creek:

Brad:

WinchelL .............. ........

Graford:

Strawn 

Capps limestone lentil >. __

Henbest, |afl. F. and1942 Fusulina Dunbar acme 

1;it

1;

{;

X

Species

afl. mcgista Thompson, 1934 F. 

X

afl. eximia Thompson, 1934 F. 

X

1

i

co

1

1 

e

X

Thompson, rickerensis 1945 F? 

X

ft

fel

X

"3

s

e

§

fe

OJ

s 

e

1 

"3

OJ

2; 

c

X

Oil

5 

G03 

CO

-o

2

03

C a/

_g"oj 

X 

o 

co

2 

e *s

d

-S 

V

X

3 

1

co

-o

g 

1

o

CO

,0

3

£3*

02

X

Oil

53

co

i

so

1

fe

X

a/

X

X

1 

I

n 

o

e 

s

X

Thompson, ohioensis T.1936

X

1

I 

S

o

a

i

o

1 

fe

fc"

X

consohrinus White, afl. T. 1932

^

of,

v

CO

2

us

a;

3

"8

"S

^

X

X

X

1

§

0?

^

X

v

I

s

tt

oJ

f^

X

X

newelli Burma, 1942 cf. T. 

^

X

IN

2

03

E

5 

3

e 

H3

L^i

V

Condra, 1927 and cullomensis Dunbar 

^

X

Condra, and 1927 cullomensis Dunbar cf.T. 

.^

X

X

Condra, and 1927 Dunbar T. cullomensis afl. 

.^

?

X

v

55 «»

1

1

,0

o

 s

"

V

* > 

2

a

o

 0 

03

A 

g

(5

E

"5,

^

X

X

Condra, and 1927 T. plummeri Dunbar cf.

E,

v

1927 Condra, and plummeri aff. T. Dunbar 

^

X

and Hayden), 1858 (Meek afl. T. ventricosus 

"*

X

1 I

B 

 c 

P03

1 

3 

1

1

L,,

X

X

X

v

X

X

X

v

v

Condra, Dunbar andbeedei 1927

L^ (

ri

of

O

g

03

a

L^.(

X

Condra, 1927 beedei Dunbar andfl.T. 

-

X

X

and Skinner, 1937 suhventricosus Dunbar cf.T. 

-

v

and Skinner, 1937 subventricosus Dunbar T. aff. 

h

v

Condra, moorei -and 1927 T. Dunbar afl.

EH

ft

fc.

X

PS 

n

fc.

X

of

u 

a

fc.

X

P 

a

fc.

X

w

a

fc-,

of.

En 

a

fc-,

v

O 

a

fc-,

v

K 

a

ti

X

a

fc.

X

fc.

M 

a

fc.

X

ij 

a

fc-,

X

Oil

2 g"

o 

s

2

C)

o

e

e

e

^

V

d

Q

v

o

C)

O 

O

(=1

V

Q 

p

^

MillcreUat sp. 

Staffella sp.

v v

X X

1 Of Plummer and Moore (1921).

2 Of Cheney (1949).
STRATIGRAPHIC DISTRIBUTION OF PENNSYLVANIAN FUSULINIDAE FROM TEXAS

EXPLANATION

Chaff in limestone

Parks Mountain

Ranger limestone

Li river limestone

FIGURE 10. Generalized columnar section of the Pennsylvania!! rocks that crop out in Brown and 

Coleman Counties. Tex. (After Eargle, 1960.)

41
42 PENNSYLVANIAN AND LOWER PERMIAN ROCKS, WEST AND CENTRAL TEXAS

STRATIGRAPHY

The Paleozoic rocks that crop out in the area have 

been assigned to the Strawn, Canyon, and Cisco groups 

of the Pennsylvania!! system, and to the Wichita group 

of the Permian system. The generalized areal distribution of rocks of the Strawn, Canyon, and Cisco 

groups in Brown and Coleman Counties is shown on 

the index map (fig. 9). Exposed rocks belonging to 

the Pennsylvania!! system have a thickness of approximately 1,065 feet and a general regional dip to the 

west-north west, ranging from 50 to 80 feet per mile 

(Eargle, 1960). The nomenclature and generalized 

lithology of the Pennsylvania!! rocks are shown on the 

columnar section (fig. 10).

Rocks of the Strawn group are chiefly shale and 

sandstone, and small amounts of limestone (fig. 10). 

These rocks have an average thickness of 80 feet between the base of the Ricker Station limestone of 

Cheney (1949) and the top of the Capps limestone 

lentil of Plummer and Moore (1921).

The rocks of the Canyon group are predominantly 

shale containing several massive beds of limestone and 

lesser amounts of sandstone. The Canyon group has 

been subdivided into 4 formations containing 7 named 

members (fig. 10). It has an average thickness of 620 

feet.

The Cisco group has been subdivided into 2 formations and 7 named members. It consists chiefly of 

shale in which are found several channel-fill deposits 

of chert conglomerate, and sandstone and numerous 

thin beds of limestone. Many of these thin limestone 

beds, especially those in the lower part, are not laterally persistent. The rocks of the Cisco group have an 

average thickness of 365 feet.

Rocks of the Wichita group of the Permian system 

were not examined for this report.

STRATIGRAPHIC DISTRIBUTION OF THE FUSULINIDS 

STRAWN GROUP UNDIFFERENTIATED

The Strawn group, undift'ereiitiated, has been defined 

by D. Hoye Eargle (1960) as including, in Brown 

County, all exposed Pennsylvanian rocks that stratigraphically underlie the Brownwood shale member of 

the Graford formation. The stratigraphy of the 

Strawn in the area of this report is complex, and exposures are scarce, owing to extensive alluvial cover. 

It therefore seems impracticable to recognize and map 

formational or smaller units of the Strawn in the area 

covered by this report, as has been clone in the Brazos 

River drainage basin. Most of the strata belonging to 

the Strawn group in Brown County is sandstone and 

shale which have no characteristically different mineral 

or f aunal assemblages to aid in their recognition. Two

limestone beds, however, the Ricker Station limestone 

of Cheney (1949) and the Capps limestone lentil of 

Plummer and Moore (1921), contain fusulinid faunas 

that are sufficiently different to allow differentiation of 

the limestones.

KICKER STATION LIMESTONE OF CHENEY (W»)

The Ricker Station limestone of Cheney (1949) generally ranges from 2 to 4 feet in thickness. It contains 

a species of fusulinid which resembles a primitive species of Fiwidina.) F. ? rickerensix Thompson, 1P45. (See 

pi. 15, figs. 15-21 and pi. 24, fig. 1.) The relationship 

of this species to those found in the younger Capps 

limestone lentil of Plummer and Moore (1921) is not 

certain. The fusulinid found in the Capps represents 

a more advanced species of Fiix-uttna. The gap in evolutionary sequence between the fusulinid in the Ricker 

Station limestone of Cheney (1949) and the fusulinid 

in the Capps limestone lentil is so great, that it suggests 

a hiatus in that part of the stratigraphic sequence in 

the area.

CAPPS LIMESTONE LENTIL OF PLUMMER AND MOOFE (1921)

The Capps limestone lentil of Plummer and Moore 

(1921) is the uppermost bed of the Strawn group. In 

Brown County, the bed attains a maximum thickness 

of 30 feet and averages about 20 feet. Fusulinids belonging to the genus Fuxulinet have been found throughout the bed. It is not yet known if the various species 

of FmuUna are restricted to definite zones. Fusulinids 

from the Capps are illustrated on plate 15, figures 1-14.

CANYON GROUP

The Canyon group, approximately 620 feet thick, 

contain 4 formations: Graford, Winchell, Brad, and 

Cacldo Creek. The rocks of the Canyon group, in the 

area of this report, contain about 83 percent shale, 15 

percent limestone, and 2 percent sandstone. The limestone beds contain the most numerous fusulinid faunas, 

although in a few places, the shales contain beds that 

are almost a coquina of fusuliiiids. A fusulinid bed in 

the Brownwood shale member of the Graford formation, exposed at locality f 10014 (fig. 9) west of Brownwood, is a good example of such a bed. Fusulinids 

were not found in the sandstones.

The change in fusulinid faunas between the Capps 

limestone lentil of Plummer and Moore (1921) of the 

Strawn group and the overlying Brownwood shale 

member of the Graford formation in the Canyon 

group is very striking. The change is from a generally large species of Fuxulina with highly fluted 

septa and a four-layered wall in the Capps, to a small 

species of Triticites with weakly fluted septa and a twolayered wall in the Canyon. Fusulinids found in the
STRATIGRAPHIC DISTRIBUTION OF PENNSYLVANIA^ FUSULINIDAE FROM TEXAS

rocks of the Canyon group in this area can be differentiated from those found in rocks of the Strawn group 

on the basis of wall structure alone.

GRAFORD FORMATION

The Graford formation has a total thickness of about 

275 feet. It includes the Brownwoocl shale member at 

the base and the Adams Branch limestone member and 

the Cedarton shale member at the top.

BROWNWOOD SHALE MEMBER

Fusulinids were collected from two beds in the 

Brownwood shale member. The lower fusulinid-bearing bed contains, in a thin limestone lentil, a fauna 

composed of Triticites irregularis (pi. 16, figs. 11-17). 

The upper fusulinid-bearing bed is about 60 feet below 

the top of the Brownwood shale member. Triticites 

nebraskensis Thompson, 1934 (pi. 2, figs. 9 and 10) is 

found in great abundance and forms lenses of coquina. 

This is the "fusulinid-bearing limestone" of Lee and 

others (1938, p. 102).

The fusulinid "Wedekindelfyia" ultimata Newell and 

Keroher, 1937, which has been found in the lower part 

of the Missouri series in the midcontinent region has 

not been found in rocks that crop out in central 

Texas. The most primitive fusulinid found in the exposed rocks of the. Canyon group is Triticites irregularis (Schellwien and Staff), 1912, which first appears 

in the Brownwood shale member of the Graford formation. These triticite fusulinids are characterized by 

moderately thin spirotheca, weakly fluted septa, elongate shape, pointed to blunt ends, small proloculus, 

and somewhat fusulinelloid chomata.

ADAMS BRANCH LIMESTONE MEMBER

The Adams Branch limestone member contains a 

characteristic triticite fauna. The fauna is composed 

of Triticites ohioensis Thompson, 1936 (pi. 16, figs. 

1 4), T. ex. gr.1 Kamanella ozagemix (Newell), 1934 

(pi. 16, figs. 7 and 8), and Kamanell-a cf. K. neglectm 

(Newell), 1934 (pi. 16, figs. 5 and 6). Triticites ohioensis is similar to but is somewhat larger and more cylindrical than T. irregularis. Kamanella ex gr. K. osagensis from this area is typically a large cigar-shaped 

fusulinid with moderately thick spirotheca and highly, 

but irregularly fluted septa. Kansanella cf. K. neglec1 "Cf." and "aff." and "ex gr." are used in the sense employed by 

Schenk and McMasters (1936, p. 23). "Cf." has been used where the 

fossil is very similar to the named species. At most the difference 

between the two is subspeciflc. "Aff." has been used for fossils that are 

related to or similar to the named species. The difference between the 

two is specific. The term "ex gr." (ex grupo) is used throughout this 

report to refer to species belonging to the same group or lineage of a 

previously described species. The species are not sufficiently similar, 

however, to warrant the use of "cf." or "aff." in conjunction with the 

specific name. 

tux and Kansanella ex gr. K. osa.gemix are probabty 

restricted to the lower part of the Adams Branch, however, available stratigraphic evidence is not sufficient to 

establish the position from which collections containing these species were made.

CEDARTON SHALE MEMBER

The Cedarton shale member, which overlies the 

Adams Branch limestone member, is not known to 

contain fusulinids in the area of this report.

WINCHELL, LIMESTONE

The Winchell limestone was defined by Eargle 

(1960) as including two main sequences of resistant 

limestone beds separated by shale, and as having a total 

thickness of about 100 feet. The limestone sequences, 

which account for about one-third of the formation, 

were called lower limestone member and upper limestone member.

The lower limestone member generally contains three 

or more limestone beds separated by shale and sandstone. The upper limestone member contains two limestone beds separated by shale and sandstone.

Fusulinids are generally rare in the Winchell. A few 

free specimens were found near the lowermost limestone 

bed at the Lake Brownwood spillway (f 10034) ; however, as the material from this part of the Winchell 

was not found in place, it is not. illustrated. The lowes4 

part of the upper limestone member at the Lake Brownwood spillway (f 10081) contains fusulinids in considerable abundance. They have also been found at P 

similar stratigraphic position at one other locality 

(f 10080) a few miles to the south (fig. 9).

Three species belonging to three different genera of 

fusulinids have been found in the upper limestone member of the Winchell. Triticites, the most common genus 

in the fauna, is represented by a species which belongs 

to the group of T. irregularix (pi. 17, figs. 19,20, 22-24). 

The other two genera are Millerellal sp. (pi. 17, fig. 

21) and Staffella'l sp. (pi. 17, fig. 25). The association 

of Millerella ? and Staff ella* with Triticites of the type 

figured here may be significant; however, until more 

collections are made from the Winchell, the meaning 

of this assemblage will remain open to question. The 

species of Triticites from the Winchell are smaller than 

those, found in beds above and below the formation.

BRAD FORMATION

The Brad formation includes the Placid shale member overlain by the Ranger limestone member. The 

formation has a thickness of about 130 feet in the southwestern part of Brown County (Eargle, 1960) but 

becomes somewhat thinner to the north.
44 PENNSYLVANIAN AND LOWER PERMIAN ROCKS, WEST AND CENTRAL TEXAS

PLACID SHALE MEMBER

The Placid shale member contains 3 limestone lentils, 

but only in the lentil near the middle have a few fusulinids been found. Fusulinids are rare or absent in the 

shale. The fauna from the limestone consists of species 

that, are related to Triticites newetti Burma, 1942 (pi. 

17, fig. 17), and two unnamed species of Triticites (pi. 

17, figs. 14-16 and 18) that are somewhat ventricose 

forms and may be forerunners of the group of Triticites 

ventricosus.

RANGER LIMESTONE MEMBER

Fusulinids are generally uncommon in the Ranger 

limestone member. Locally, however, they may be numerous. Representative specimens of the three triticite 

species from the Ranger are shown on plate 17: Triticites cf. T. cuflomensLs Dunbar and Condra, 1927 (fig. 

13) ; Triticites cf. T. neweUi (fig. 12) ; and Triticites 

sp. D(figs. 10 and 11).

CADDO CHEEK FORMATION

The Caddo Creek formation as defined by Eargle 

contains the Colony Creek shale member below and the 

Home Creek limestone member above. Eargle ascribes 

a thickness of 55 to 75 feet to this formation in Brown 

County.

COLONY CREEK SHALE MEMBER

The Colony Creek shale member probably does not 

contain fusulinids in the area. In southeastern Coleman County, however, along Home Creek, the shale 

interval between the Ranger limestone member of the 

Brad formation and the overlying Home Creek limestone member of the Caddo Creek formation grades 

laterally into limestone. Deposition of limestone in 

this area may have been continuous from Ranger 

through Home Creek time. Fusulinids that show affinities to those in the Ranger are found scattered 

throughout the lower part of this interval of rocks 

(pi. 24, figs. 14-16). Fusulinids have not been found 

in the central part, of this sequence; those found in the 

upper part are much like the Home Creek fauna (pi. 

24, figs. 4-13). Because of the uncertain time and stratigraphic relations of the rocks at this place, the fusulinids illustrated are shown separately on plate 24.

HOME CREEK LIMESTONE MEMBER

The Home Creek limestone member is the uppermost 

unit of the Canyon group. Triticites from the type section of the Home Creek are somewhat ventricose and 

have rather thin spirotheca. The septa are weakly to 

moderately plicated in the outer whorls. The triticite 

fauna consists of Triticites aff. T. consobrinus White, 

1932 (pi. 17, figs. 1 and 2), and Triticites sp. A. (pi. 17, 

fig. 3). Also found in the type section are a few specimens of the primitive genus Staffellal (pi. 17, fig. 5).

Triticites cf. T. secalicus (Say), 1833 (pi. 17, figs. 7-9), 

has been found in the Home Creek, but not in the type 

section. Triticites sp. B (pi. 17, fig. 4), and Triticites 

sp. C (pi. 17, fig. 6) have also been found in the Home 

Creek.

CISCO GROUP

The Cisco group, approximately 370 feet thick, contains two formations: the Graham formation at the 

base and the Thrifty formation at the top. The Cisco 

is approximately 67 percent shale, 16 percent limestone, 

and 17 percent sandstone. During the Permian period 

(Wolfcamp time), channels were cut into rocks of the 

Cisco group and subsequently filled with sandstone. As 

these channel deposits are of variable thickness and 

cannot always be separated from similar rocks of the 

Cisco group, the sandstone percentage given above is 

merely an approximation. Fusulinids are most common 

in the limestones and less common in the shales and 

have not been found in the sandstone.

The fusulinid faunas from the lower part of the 

Cisco group differ little from those of the upper part 

of the Canyon group. Two primitive genera, Staffella ? 

and MiUerelld, have been found as high in the sequence 

as the Gunsight limestone member of the Graham formation. The younger species of Triticites, in general, 

become progressively more complex in their internal 

structure. In the lowermost rocks of the Cisco group, 

they have slightly more highly fluted sep+a, slightly 

greater wall thickness, and somewhat larger proloculi 

than those found in the Canyon. Two formr of triticite 

become apparent in the lower part of the Cisco. One 

form is the somewhat elongate, generalized form of the 

group of Triticites secalicm ; the other is suggestive of 

Triticites ventricosus (Meek and Hay den), 1858.

The evolution of the triticite fauna in the Cisco 

group is manifested by a general increase in size, wall 

thickness, and diameter of proloculus. Complexity 

of septal fluting shows a slight increase, but it is not 

proportional to the change in the other characteristics.

Two genera make their first appearance in the Cisco 

of Brown and Coleman Counties. The first to appear is 

DunbarineUa, which has been found in the upper part 

of the Bluff Creek shale member of the Graham formation. The other is Schubertella, which is quite common 

in the Speck Mountain limestone member of the Thrifty 

formation where it is associated with Triticites plummeri Dunbar and Condra, 1927, and Dunba,rinella spp.

GRAHAM FORMATION

The Graham formation has been divided into the 

following members in descending order:

Shale overlying the Ivan limestone member 

Ivan limestone 

Wayland shale
STRATIGRAPHIC DISTRIBUTION OF PENNSYLVANIAN FUSULINIDAE FROM TEXAS 45

Gunsight limestone 

Bluff Creek shale

Eargle (1960) states that the Graham formation 

is about 265 feet thick in southeastern Coleman County 

and about 290 feet thick in northern Brown County 

The formation overlies the Home Creek limestone 

member of the Caddo Creek formation and is overlain 

by the Speck Mountain limestone member of the 

Thrifty formation.

The Graham formation is about 75 percent shale, 20 

percent limestone, and 5 percent sandstone. Much 

sandstone is locally present as channel fill. The limestone, most of which contains a fusulinid fauna, is 

found as numerous thin beds spaced at irregular intervals throughout the sequence. Fusulinids have also 

been found in some of the more calcareous facies of the 

shale.

BLUFF CREEK SHALE MEMBER

The Bluff Creek shale member contains as many as 

six beds of limestone, most of which are discontinuous 

and of variable thickness. Fusulinids from these limestones are very similar. Differences in the faunas can 

sometimes be observed by detailed examination of large 

collections, but correlation of the various limestone 

beds on the basis of fusulinid faunas cannot generally 

be made.

The lower three limestone beds in the Bluff Creek 

shale member have in the past been correlated with the 

White Ranch limestone of Bullard and Cuyler (1935) 

in McCulloch County, south of the Colorado River, and 

with the Gonzales limestone of Ross (1921) and North 

Leon limestone of Reeves (1922) members of the Graham formation of the Brazos River drainage basin. 

Use of these names, however, is discouraged until detailed stratigraphic studies and geologic mapping of 

key areas have been accomplished (D. Hoye Eargle, 

1960). These 3 limestone beds contain 2 genera and 3 

species of fusulinids: Triticites cf. T. consobrinm (pi. 

18, figs. 20 and 22); Triticites cf. T. secalicm (pi. 18, 

figs. 21 and 23); and a species of Staff ellal (pi. 18, fig. 

19) that is relatively large for the genus.

The two limestone beds near the middle of the Bluff 

Creek shale member contain 3 genera and 5 species of 

fusulinids. They are Millerella.l. sp. (pi. 18, fig. 11), 

Staff etta? sp. (pi. 18, fig. 12), Triticites aff. T. secalicus 

(pi. 18, figs. 13 and 14), Triticites sp. F (pi. 18, figs. 

10, 16-18), and Triticites sp. G (pi. 18, fig. 15). Triticities sp. F. belongs to the group of T. ventricosus ; Triticites sp. G is related to the group of T. secalic-us.

The uppermost limestone bed (Bunger limestone 

member of the Graham formation) contains a triticite 

fauna composed of three species: Triticites cf. and aff. 

T. plummeri (pi. 18, figs. 4 and 5) ; Triticites cf. T.

cullomensis (pi. 18, figs. 6-8); and Triticites ex gr. 7. 

ventricosus (pi. 18, fig. 9).

Fusulinids have been found at the top of the Bluff 

Creek immediately below the Gunsight limestone member. Notable is the first occurrence of Dunbarinella 

(pi. 18, fig. 1), which is here associated with Triticites 

cf. T. oryziformis Newell, 1934 (pi. 18, figs. 2 and 3).

GUNSIGHT LIMESTONE MEMBER

The Gunsight limestone member (Campophyttutn 

bed of earlier workers) consists of as many as four 

limestone beds separated by shale. The Gunsight limestone member ranges in thickness from 13 to 25 feet.

Fusulinids from the lower, middle, and upper parts 

of the Gunsight limestone member are figured. Two 

genera and three species have been found in the lower 

part of the Gunsight. The fauna consists of Dunbarinella cf. D. ervinensis Thompson, 1942 (pi. 19, fig. 

15) ; Triticites cf. or aff. T. secalicus (pi. 19, figs. 10,11, 

13 and 16); Triticites ex gr. T. ventricosus (pi. 19, fig. 

14) ; and Triticites ? sp. (pi. 19, fig. 12).

The middle part of the Gunsight contains StaffeUal 

sp. (pi. 19, fig. 9); Triticites aff. T. cullomensis (pi. 19, 

fig. 8) ; and Triti-cites ex gr. T. ventricosus (pi. 19, figs, 

6 and 7).

The upper part of the Gunsight contains Triticites 

cullomensis (pi. 19, fig. 5) ; Triticites aff. T. cullomensis 

(pi. 19, fig. 1) ; Triticites ex gr. T. ventricosus (pi. 19, 

figs. 2 and 3); and Triticites sp. H (pi. 19, fig. 4).

WAYLANDSHALE MEMBER

The Wayland shale member ranges in thickness from 

about 100 feet along the Colorado River in southern 

Brown and Coleman Counties to 75 feet near the center 

of Brown County. Terriere (1960) reports the 

Wayland to have an estimated thickness of 140 feet ir 

the southern part of the Grosvenor quadrangle (northwestern Brown County), and about 65 feet in the northern part of the quadrangle. Fusulinids are not widely 

distributed throughout the Wayland, but they are f ounc1 

in a few places in two zones. Where they occur, they 

are present in great numbers. One of these fusulinidbearing zones is 5 to 15 feet above the base of the Wayland, and the other, a lentil of argillaceous limestone, 

is about 28 feet below the Ivan limestone member. The 

lower fauna contains Triticites beedei Dunbar and Condra, 1927 (pi. 20, figs. 5 and 7); Triticites aff. T. beedei 

(pi. 20, figs. 6 and 9) ; Tri-ticites plummeri (pi. 20, fig. 

8); and Triticites ex gr. T. ventricosus (pi. 20, fig. 10). 

The fauna from the lentil of argillaceous limestone 

contains Triticites cf. T. beedei (pi. 20, fig. 1), Triticites 

aff. T. beedei (pi. 20, fig. 3), Triticites ex gr. T. ventricosus (pi. 20, fig. 2), and Triticites sp. I (pi. 20, fig. 4).

528409 O 60
46 PENNSYLVANIAN AND LOWER PERMIAN ROCKS, WEST AND CENTRAL TEXAS

IVAN LIMESTONE MEMBER

The Ivan limestone member (Bellerophon bed of earlier workers) is a lenticular limestone that changes 

laterally into calcareous sandstone and shale within 

short distance (Eargle, 1960). Locally it is as 

much as 18 feet thick. In places the Ivan consists of 

two distinct beds of limestone separated by shale.

Fusulinids are not everywhere present in this member and are apparently confined to its calcareous facies. 

In the lower part of the member, two species of fusulinids have been found; these species are Triticites aff. 

T. beedei (pi. 21, figs. 10 and 11) and Triticites ex gr. 

T. ventricosm (pi. 21, fig. 12).

Fusulinids have also been collected from a shaly 

facies near the middle of the Ivan at locality f!0012. 

This fauna consists of 2 genera and 5 species: Dunbarinella cf. D. ervinemis Thompson, 1942 (pi. 21, fig. 

5), Triticites sp. J. (pi. 21, fig. 6), Triticites aff. T. 

beedei (pi. 21, fig. 7), Triticites aff. T. cuttomensisl 

(pi. 21, fig. 8), and Triticites ex gr. T. ventricosus (pi. 

21, fig. 9).

The upper part of the Ivan contains a fusuliiiid fauna 

composed of two species of Triticites: Triticites aff. T. 

beedei (pi. 21, figs. 1 and 4) and Triticites aff. T. ventricosus meeki (pi. 21, figs. 2 and 3).

SHALE OVERLYING THE IVAN LIMESTONE MEMBER

The shale which overlies the Ivan limestone member 

ranges in thickness from 25 to 65 feet. Fusulimds have 

not been found in this shale.

THRIFTY FORMATION

The Thrifty formation has been redefined by Eargle 

(1960) to include the following members in descending order:

Chaffin limestone 

Parks Mountain sandstone 

Breckenriclge limestone 

Speck Mountain limestone

The formation contains two persistent beds of limestone (the Speck Mountain and Chaffin limestone members), a less persistent bed of limestone (the Breckenriclge limestone member), and a lenticular sandstone 

(the Parks Mountain sandstone member). Relatively 

nonresistaiit unnamed beds of shale with minor amounts 

of sandstone occupy the intervals between the more resistant limestone and sandstone beds listed above.

The Thrifty formation, from the base of the Speck 

Mountain to the top of the Chaffin, ranges in thickness 

from about 55 feet in southern Coleman County to 

about 95 feet in northern Brown County.

Distribution of the fusulinids in the Thrifty formation is similar to that in the Graham formation. They 

are most commonly found in the limestone beds and

less commonly in the shales and have not been found 

in the sandstones.

SPECK MOUNTAIN LIMESTONE MEMBEF

The Speck Mountain limestone member i^ generally 

a continuous bed from 1 to 6 feet thick. Fusulinids are 

commonly found wherever this member is exposed. The 

assemblage for this member is distinctive f-nd usually 

consists of Triticites plummeri, Dunbarinella spp., and 

ScJiuberteUa. sp. A (pi. 22, fig. 13), whicl resembles 

Schubertetta kingi Dunbar and Skinner, 1937. In addition to this distinctive assemblage, several other species of Triticites have been found; these are Triticites 

ex gr. T. ventricosm and Triticites ex gr. T. secdlicus. 

The fusulinid fauna from the Speck Mountain is shown 

on plate 22, figures 7 through 15, and the relative sizes 

of Triticites, Dunbarinella, and Schubertella are shown 

on plate 24, figures 2 and 3.

BRECKENRIDGE LIMESTONE MEMBER

The Breckenridge limestone member is separated 

from the Speck Mountain limestone member by about 

30 feet of shale and sandstone that contain very few 

fusulinids, none of which are figured her?.

The Breckenridge is typically a nodular-weathering 

limestone ranging from 1 to more than 3 fe^t in thickness. Its outcrop is principally continuous as far south 

as the vicinity of Home Creek in southeastern Coleman 

County. Locally, however, the position of the Breckenridge is occupied by channel-fill sandstone and conglomerate. ~ Fusulinids are most common in the Breckenridge in the northern part of the area; they are rare 

in the southern part.

Fusulinids from the member belong to the genus 

Triticites. The fauna consists of Triticites sp. K (pi. 

22, fig. 1); Triticites plummeri (pi. 22, fig. 2); Triticites 

aff. T. subventricosu* Dunbar and Skinner, 1937 (pi. 

22, figs. 3 and 6); Triticites sp. L (pi. 22, fig. 4) ; and 

Triti-cites ex gr. 7\ secalicus (pi. 22, fig. 5).

INTERVAL BETWEEN THE BRECKENRIDGE ANI CHAFFIN 

LIMESTONE MEMBERS

The rocks between the Breckenridge and the Chaffin 

limestone members are shale and lenticular bodies of 

sandstone, including the Parks Mountain sandstone 

member. The Parks Mountain fills channels that have 

been cut into and locally through the Breckenridge and 

Speck Mountain limestone members. Fusulinids have 

not been found in these shales or sandstones.

CHAFFIN LIMESTONE MEMBER

The Chaffin limestone is generally persistent throughout the area. It is about 15 feet thick at the type section, immediately south of the Colorado River in 

McCulloch County. In northern Brown County the 

member is only 1 to 2 feet thick. Fusulinid? are found
STRATIGRAPHIC DISTRIBUTION OF PENNSYLVANIA!* FUSULINIDAE FROM TEXAS 47

in most outcrops of the Chaffin. Most of the fusulinicls 

are large and ventricose and in many respects resemble 

those found in the Permian rocks of the area, a resemblance suggested by the very thick spirotheca, the 

large proloculus, and the massive chomata present in 

most forms.

The fusulinid fauna of the Chaffin is composed of 

Triticites cf. T. subventricosii* (pi. 23, figs. 1-3) ; Triticites aff. T. beedei (pi. 23, figs. 4, 6, 7, and 9) ; Triticites 

phtmmeri (pi. 23, figs. 5 and 12) ; Triticites aff. T. 

moorei Dunbar and Coiidra, 1927 (pi. 23, fig. 7) ; T riftcites sp. M (pi. 23, fig. 8) ; Triticites ex gr. T. ventricomts (pi. 23, figs. 10 and 11); and DwnbarimTla.? sp. D 

(pi. 23, fig. 13). The larger, more ventricose species of 

Tnticites are common in the Chaffin limestone member 

in this area: Dioibannella? sp. D is rare.

SUMMARY

The Pennsylvania!! rocks of Brown and Coleman 

Counties lie. mostly within the zone of Triticites although an older zone, that of Fwulma, is represented 

in the Strawn group undifferentiated. The zone of 

Triticites is represented in the rocks of the Canyon and 

Cisco groups of Pennsylvania!! age but extends upward 

into the Wichita group of Permian age.

The fusulinid faunas are abundant and varied. The 

genus Triticites exhibits a general evolutionary series 

that embraces the small, thin-walled, and relatively 

simple species in the lower part of the Canyon group 

and the large ventricose thick-walled species in the 

upper part of the Cisco group.

Within the zone of Triticites, each limestone or group 

of limestones contains a distinctive assemblage of 

fusulinicls. These assemblages are such that they may 

be used for purposes of local correlation. For distant 

correlations, such as with the subsurface of the Midland 

basin of west Texas, the. assemblages herein reported on 

should be used only by comparing evolutionary development of similar fusulinid faunas in the two areas.

The influence of sedimentary facies on the fusulinids 

is not known. It is believed that it may play an important part in the distribution of species or varieties. 

However, because of the extreme variability within the 

species of a fusulinid group, and because of the lack of 

knowledge concerning the influence of environment on 

a species, it is not known which characteristics are due 

to environmental adaptation and which are due to variation within the species itself. The gradation, or state 

of development, between species is believed by this 

writer to proceed at a more or less uniform rate; and 

by comparing evolutionary stages, it is possible to make 

correlations of the containing rock units.

COLLECTING LOCALITIES

The following register of collecting localities has been 

compiled in large part from notes taken by the collector. These localities have been plotted on county road 

maps prepared by the Texas State Highway Planning 

Commission (fig. 9). No adequate base map exists for 

the entire area, and these maps represent the best available for this purpose.

The localities listed on the register are arranged in 

stratigraphic sequence starting with the oldest units 

Localities from the same bed have been placed in numerical order.

The "f"" numbers refer to the U.S. Geological Survey 

collection of Foraminifera.

The letters "AMS" used in association with quadrangle names refer to publication of that quadrangle by 

the Army Map Service. Grid references on these mapr 

are to a military grid superimposed on the base map^ 

with measurements given in decimal fractions from the 

northwest corner of the grid.

Richer Station limestone of Oheney (1949)

f!0003. Brown County. Limestone occurring as large blocks 

along the west side of the road, 600 ft south of Kicker 

Station on the Gulf, Colorado, and Santa Fe RE., about 5 

miles east of Brownwood. Collected by D. H. Eargle and 

K. A. Yenne, Apr. 18, 1951.

flOOQ4. Brown County. In bed of abandoned road just soutl 

of present road, 5.7 miles southeast of Brownwood, Tex., 

courthouse on the Elkins road, which is a continuation 0* 

Brownwood's Austin Ave.; 1.7 miles southeast of intersection with paved road. Collected by D. H. Eargle and K. AYenne, Apr. 19, 1951.

f!0077. Brown County. Limestone about 1 ft thick, weathers 

into boulders. At this locality it disappears beneath overlying Cretaceous conglomerate. Zephyr quadrangle, AM? 

ser. Y782, sheet 6247-III. Grid 507.5, 501.1, 0.9 of a mile 

south of BM 1401 on the Brownwood-Elkins road, 6.5 miles 

S. 38° E. of intersection of U.S. Highways 84, 67, and 377 

at Brownwood. Collected by D. H. Eargle, June 29, 1950.

Capps limestone lentil of Plummer and Moore (1921)

flOOOS. Brown County. Anthills containing fusulinids, 10 

miles south-southwest of Brownwood, 2 miles north-northwest of Indian Creek; east slope of peak (Cretaceous 

outlier) about 1,000 ft east of crest of peak, 500 ft west o* 

earth stock tank. Collected by D. H. Eargle, 1951.

f!0009. Brown County. Shale in the Strawn group immediately below the Capps limestone lentil. On slope of hill 

just west of road, half a mile south of Pecan Bayou bridge 

on military road to Camp Bowie; 4.2 miles S. 44° E. of 

intersection of U.S. Highways 84, 67, 377, and 183 at 

Brownwood. Collected by D. H. Eargle, 1951.

f!0027. Brown County. On north-facing hill just east of Delaware Creek and south of U.S. Highway 84, 3.45 miles N. 

80° E. of the courthouse at Brownwood; 1.4 miles S. 60° E. 

of the Early School. Collected by D. H. Eargle, Nov. If, 

1950.
48 PENNSYLVANIAN AND LOWER PERMIAN ROCKS,, WEST AND CENTRAL TEXAS

f 10076. Brown County. Mercury quadrangle, AMS ser. V782, 

sheet 6146-1. SE. cor., SW% grid 498-499, 484-485; on 

southeast side of hill 1441, at approximately 1,400 ft elevation; 0.9 mile S. 68° W. of USBM 1297, 1.1 miles N. 30° 

E. of Keys Crossing on the Colorado River. Collected by 

D. H. Eargle, Feb. 23, 1952.

f!0078. Brown County. Fusulinids from upper part of an 18' 

inch pale-gray limestone. In livestock yard I 1/-! miles west 

of the Early School, 1% miles northeast of the Brownwood 

courthouse. Collected by D. H. Eargle, July 11, 1951.

Brownwood shale member of the Graford formation

f!0014. Brown County. Collected from a 6-in. limestone bed 

that is a fusulinid coquina, 53 ft below top of member; 2 

miles northwest of Brownwood. Roadcut of U.S. Highways 67 and 84 in steep hill overlooking Brownwood. 

Considered by Eargle to be type locality of the Brownwood shale member. Collected by D. H. Eargle, Apr. 20, 

1950.

f 10030. Brown County. Lower part of the Brownwood shale 

member. Gray limestone containing many fragments of 

fossils; loose part contains many fusulinids. Upper 1 ft 

is pebbly and apparently disturbed; lower 6 in. is solid, 

hard limestone containing rounded limestone pebbles. One 

mile northeast of Dulin on U.S. Highway 377. In wall of 

gully east of road. Collected by D. H. Eargle and P. Katich, 

Jan. 3, 1952.

flOOSl. Brown County. Gray limestone that weathers yellow 

and contains fusulinids; 1 mile east of Winchell in southern Brown County on north side of road, where the road 

trend changes from north to east, more or less paralleling 

the Colorado River. Collected by D. H. Eargle, May 3, 

1951; revisited and recollected by D. A. Myers, May 7, 1953.

f!0032. Brown County. Fusulinids occur in gray-weathering 

limestone. 2.1 miles S. 85° E. of Winchell in southern 

Brown County, north of east-trending road in bandlandtype of topography. Collected by D. A. Myers, May 8, 1953.

f!0033. Brown County. Limestone slightly above the middle 

of the Brownwood shale member; 3.8 miles N. 55° E. of 

Winchell, 3.4 miles S. 15° E. of Brookesmith on old Brownwood-Brady highway; 0.7 mile northeast of right-angle 

bend on highway. Collected by D. H. Eargle and D. A. 

Myers, May 7, 1953.

Adams Branch limestone member of the Graford formation

flOOOl. Brown County. Floor of abandoned part of quarry 

along south side of drainage ditch. In quarry of Waco-Tex 

Material Co., a mile west of Brownwood, Tex. Collected 

by D. H. Eargle, Mar. 18,1950.

f!0013. Brown County. Collection from near base of 20-26 ft 

of limestone in quarry, 4.9 miles south-southwest of the 

courthouse at Brownwood. Half a mile west of Brownwood Country Club in quarry on hillcrest. Collected by 

D. H. Eargle, Mar. 29,1950.

f!0018. Brown County. About 3 ft of limestone exposed. Anthill between road and bed of dry stream on top of limestone 

contains abundant long, cigar-shaped fusulinids; 5 miles 

northeast of Brookesmith on southwest-trending county 

road. Collected by D. H. Eargle, July 9,1951.

f!0028. McCulloch County. Lower part of the Adams Branch 

limestone member. Mercury quadrangle, AMS ser. V782, 

sheet 6146-1. Grid 482-483, 479-480. On tip of a sharp 

bend of the Colorado River to the south, 1.95 miles S. 45° W.

of USBM 1345 at Winchell across the river from Adams 

Ranch (formerly Bud Rice Ranch). Collected by D. A. 

Myers, May 10,1954.

Winchell formation

f!0034. Brown County. Lowermost limestone of the Winchell 

formation. Spillway of Lake Brownwood dam on east side 

of lake at junction of spillway with Pecan Bayou, 8.1 miles 

N. 10° W. of triangle intersection of U.S. Higtways 67, 84, 

and 377 at Brownwood. Collected by D. H. Eargle and 

W. A. Heck, Apr. 7,1950.

f 10080. Brown County. Lower bed of upper limestone member 

in the Winchell. Fusulinids were found in the lower 4 ft 

of an approximately 30-ft-thick bed of limestone, which 

forms the hill top. The limestone is smooth weathering and 

somewhat ferruginous. Hillslope on north side of secondary 

road, 3.2 miles N. 76° W. of the intersection o* U.S. Highways 67, 84, and 377 at Brownwood; 1.5 mil^s (airline) 

southwest of State Road 279. Collected by P. T. Stafford, 

R. T. Terriere, and D. A. Myers, Mar. 10,1955.

f 10081. Brown County. Lower bed of upper limestone member 

in the Winchell. Fusulinids were found in tb<> lower 1 ft 

of a massive limestone that crops out on the fouth side of 

Lake Brownwood spillway above a low concrete wall. The 

spillway is on the east side of the lake, 8.1 mil<?s N. 10° W. 

of the intersection of U.S. Highways 67, 84, and 377 at 

Brownwood. Collected by D. A. Myers, Mar. 10, 1955.

Placid shale member of the Brad formati'm

f!0035. Coleman County. Unnamed limestone lentil in shale 

at foot of escarpment of Ranger limestone member of the 

Brad formation and Home Creek limestone member of the 

Caddo Creek formation. Mercury quadrangle, 3.0 miles N. 

50° W. from southeast corner of Coleman Cornty, 1,000 ft 

west-northwest from USBM 1322 on Home Cre?k; 1.4 miles 

N. 23° W. from mouth of Home Creek on the Colorado 

River. Collected by D. H. Eargle and D. A. Myers, June 

4, 1953.

f!0036. McCulloch County. Unnamed limestone lentil in the 

Placid shale member, about 40 ft below the Panger limestone member. Mercury quadrangle, AMS ser. V782, sheet 

6142-1; grid 478.7, 482.0 just west of mouth of McDowell 

Creek on small knoll overlooking the Colorado River and 

McDowell Creek. 1.4 miles N. 70° W. of intersection of 

the Brown-Coleman County line with the Colorado River. 

Collected by D. H. Eargle, Feb. 24, 1952.

Ranger limestone member of the Brad formation

f!0037. Coleman County. Basal part of Ranger limestone 

member. Mercury quadrangle 1,200 ft N. 27° W. of USBM 

1309, which is 4,400 ft west of the Coleman-Brown County 

line, and 600 ft north of the Colorado River; 1.3 miles N. 

50° W. of the southeast corner of Coleman County, and 

0.75 mile northwest of the junction of Home Creek with 

the Colorado River on the west side of the hill; 3.45 miles 

N. 85° W. of USBM 1345 (southeast corner o* rock fence 

around first house south of U.S. Post Office) at Winchell. 

Collected by D. A. Myers, June 3,1953.

flOOSS. Brown County. Ranger limestone member, 4% miles 

west of Cedarton, 300 yd east of Mt. Zion Church, in a 

caliche pit south of east-trending road. Collected by D. H. 

Eargle, July 10,1951.
STRATIGRAPHIC DISTRIBUTION OF PENNSYLVANIAN FUSULINIDAE FROM TEXAS 49

f!0039. Brown County. On west side of north-northeast-trending county road, 3.6 miles S. 87° W. of Cedarton; 9.4 miles 

S. 53° W. of triangle intersection of U.S. Highways 67, 84, 

and 377 at Brownwood. Collected by D. A. Myers and D. H. 

Eargle, May 11, 1953.

Home Creek limestone member of tlie Carfdo Creek formation

f!0029. Brown County. North side of Farm Road 279, 6 miles 

N. 65° W. of triangle intersection, U.S. Highways 67, 84, 

and 377 at Brownwood. Collected by D. H. Eargle, July 

24, 1951.

f 10040. Brown County. Anthills just below the Home Creek 

limestone member on a hillside east of State Highway 279, 

where it crosses the cuesta formed by the Home Creek 

limestone member, about. 5% miles northwest of the courthouse at Brownwood. Collected by D. H. Eargle, July 24, 

1951.

f!0041. Coleman County. First limestone below the yellow 

limestone at head of northeast-trending gully that drains 

into Home Creek. Type area of member. Mercury quadrangle, AMS ser. V782, sheet 6146-1, center NEi/iSE1/!, 

grid 483-4, 476-7; 2.9 miles N. 60° W. of junction of Coleman, Brown, and McCulloch Counties, 0.4 mile N. 54° E. of 

house BM 1471, on western edge of map; 1.1 miles N. 40° 

W. from junction of Home Creek with the Colorado River. 

Collected by D. H. Eargle and D. A. Myers, June 4, 1953.

Bluff Creek shaJe member of tlie Graham formation 

Lower beds

f!0047. Brown County. Shale in hillslope south of road, 4.1 

miles N. 45° W. of Brookesmith; 7.6 miles S. 20° W. of 

main-road intersection on east side of Bangs; 1.2 miles N. 

75° E. of Mount View Church. Collected by D. H. Eargle, 

Jan. 5, 1952.

f!0048. Brown County. 4.6 miles S. 9° E. of junction of Farm 

Road 586 with U.S. Highways 84 and 67 at Bangs, on 

right-angle bend in road in southern end of Janellen oil 

field. Collected by D. H. Eargle, Jan. 23, 1951.

Middle beds

f!0045. Brown County. West of Rocky Creek Church, 0.4 mile 

on top of hill, 7% miles northwest of Brownwood on State 

Highway 279. Collected by D. H. Eargle, July 24, 1951.

f!0049. Brown County. Limestone bed in the lower part of 

the Bluff Creek shale member about 30 ft. above earthen 

livestock tank; 41/: miles northwest of Brookesmith, about 

0.2 mile west of the road at Mount View Church. Collected 

by D. H. Eargle, May 5, 1952.

flOOSO. Brown County. Grosvenor quadrangle. On west side 

of a dirt farm road that goes south from Park Road 15, 

3.7 miles N. 50° E. of Thrifty. Locality is 1.1 airline miles 

south of Park Road 15. Collected by R. T. Terriere. 

August 1952.

f 10051. Brown County. Grosvenor quadrangle. On southwest 

side of Park Road 15, 0.7 mile (by road) east of road 

intersection at old Weedon's school. Collected by R. T. 

Terriere, August 1952.

Upper beds

f!0042. Brown County. 1.0 mile S. 45° E. of intersection of 

U.S. Highways 84 and 67 and Farm Road 586 in Bangs 

(main intersection) ; 0.35 mile east of the Bangs ( ?) cemetery on an east-trending country road. Collected by D. H. 

Eargle and D. A. Myers, May 11, 1953.

f!0043. Brown County. Anthills and slabs of limestone from 

uppermost limestone bed in the Bluff Creek shale member. 

Approximately 0.4 mile south of triangulation station 

"Shields." On Farm Road 586, 41/£ miles north-northwest 

of its intersection with U.S. Highway 377. Collected by 

D. H. Eargle, Jan. 3,1951.

f!0046. Brown County. Uppermost limestone bed in the Bluff 

Creek shale member, 1% miles N. 60° E. of Thrifty. On 

north side of hill on Frank Bucy Ranch in a small draw 

on the south side of the Jim Ned Creek arm of Lake Brownwood. Collected by D. H. Eargle, Aug. 9,1950.

f 10052. Coleman County. Bluff Creek shale member immediately below the Gunsight limestone member. N. 49° E. 5.9 

miles from Whon; S. 3° E. 3.0 miles from Trickham. Exposed in a gully 3-5 ft deep on a north-facing hill on a 

draw tributary to Mukewater Creek. Collected by D. H. 

Eargle, Jan. 21,1952.

Gnnsioht limestone member of the Graham formation

110021. Brown County, Tex. Anthills south of road on the 

upper part of the Gunsight. limestone member. At first 

right-angle bend on road to Thrifty from State Highway 

279, 2.1 miles southeast of Thrifty. Collected by D. H. 

Eargle and K. A. Yenne, Mar. 18,1951.

f!0022. Brown County, Tex. Lower part of the Gunsight limestone member with many large fusuliuids and "Campopliyllum." 1 mile southeast of Thrifty, southwest of road 

to Thrifty from State Highway 279. In creekbed below 

bridge. Collected by D. H. Eargle, Mar. 18,1951.

f!0058. Brown County, Tex. On Bangs-Brookesmith road, 0.8 

mile south of Concord Church; 5.9 miles S. 25° W. of intersection of U.S. Highway 84 and Farm Road 586 at Bangs. 

Upper part of the Gunsight limestone member. Collected 

by D. H. Eargle, Jan. 23, 1951.

fl()059. Brown County, Tex. Gray limestone that weathers 

brown. 5.1 miles S. 23° W. of intersection of U.S. Highway 

84 and Farm Road 586 at Bangs; 5.5 miles N. 30° W. of 

Brookesmith. At east end of east-trending jog in northtrending road, 1.1 miles south of Concord Church. Collected by D. H. Eargle and D. A. Myers, May 11, 1953.

f!0060. Brown County, Tex. Lower part of the Gunsight limestone member just below the coral-bearing ("Campophyllum") beds. 6.4 miles S. 23° W. of intersection of U.S. 

Highway 84 and Farm Road 586 at Bangs; 6.4 miles N. 

36° W. of Brookesmith, on north-trending road, near bottom 

of hill; 0.2 mile south of east-trending jog in road. Collected by D. H. Eargle, Jan. 5, 1952.

f 10061. Coleman County, Tex. Upper part of the Gunsight limestone member. 3 ft of gray limestone which overlies1 about 

4 ft of clay. 3.5 miles N. 25° E. of Trickham, on easttrending road, about 0.7 mile west of intersection with 

Farm Road 586, west of small creek in north bank of road. 

Just west of Brown-Coleman County line. Collected by D. 

H. Eargle, Jan. 7,1952.

f!0067. Coleman County, Tex. Unnamed limestone bed in the 

lower part of the Gunsight. Limestone weathers yellow 

and is blue black on fresh surface. In creek crossing road 

on Gill Ranch. Waldrip quadrangle, 2.4 miles due east of 

Whon; 0.5 mile south of Home Creek in northeast corner 

of Waldrip quadrangle; below an outlier of the Gunsight 

on north slope of north end of outlier. Collected by D. A. 

Myers and D. H. Eargle, June 4, 1953.

f!0068. Coleman County, Tex. Near top of Gunsight limestone 

member from bed at water level (about 8 in. below road
50 PENNSYLVANIAN AND LOWER PERMIAN ROCKS, WEST AND CENTRAL TEXAS

level at crossing) in slabby gray limestone that breaks into 

lenticular splinters % to 1 in. thick. Gunsight in bed of 

Home Creek at road crossing west of ranch; locality is 5.4 

miles S. 30° AY. of Trickham, 2.9 miles N. 42° E. of Whon. 

Collected by D. A. Myers, June 5,1953.

f 10069. Brown County, Tex. Quarry in " CamttopliyJlum"' bed. 

0.4 mile south of Park Road 15, to 36th Division State Park 

on Lake Brownwoort, on Weedon's Ranch; 4.6 miles N. 50° 

E. of Thrifty. Fusulinids very common to abundant in 

marly limestone. Large ventricose fusulinids weather from 

outcrop. Collected by D. A. Myers and Helen Beiknian, 

Oct. 3, 1954.

Wat/land xhale member of the Graham formation

flOOll. Brown County, Tex. Near base of Wayland shale member. In field west of road, 0.8 mile southeast of Thrifty. 

Collected by D. H. Eargle, July 20, 1950, Apr. 18, 1951.

f!0065. Coleman County, Tex. Limestone lentil in Wayland 

shale member. 2.7 miles N. 2° E. of Trickham, 0.5 mile 

south of east-trending road. Collected by L. G. Henbest, 

D. H. Eargle, R. C. Douglass, and D. A. Myers, Oct. 19, 1952.

f!0066. Coleman County, Tex. 2Vj ft of limestone, which is 

nodular in the upper part, slabby and solid in lower 6 in. 

0.25 mile north of east-trending road, at f 10061 (Gunsight) ; 

3.8 miles N. 24° E. of Trickham, just west of Brown-Coleman 

County line. Collected by D. H. Eargle, Jan. 7, 1951.

Ivan limestone member of the Graham formation

f!0012. Brown County, Tex. On east-trending country road 

south of the Gulf, Colorado, and Santa Fe Railroad. Approximately three-eighths of a mile east of Coleman County 

line; 4 miles west-southwest of Bangs and l 1/^ miles southwest of Amarada. On south side of a new roadcut through 

hill; the old road made a jog to south around hill. Collected by D. H. Eargle, Nov. 15,1950.

f!0026. Coleman County, Tex. 3.8 miles north of Trickham, iy2 

miles east-northeast of Mukewater School; one-third of a 

mile north of small oil field ; southwest of Mukewater Creek 

on dip slope of Ivan limestone member. Collected by D. H. 

Eargle, Jan. 8, 1952.

f!0062. Coleman County, Tex. Hard massive yellowish-gray 

limestone on point of hill facing broad valley of Home 

Creek to the southwest. 0.7 mile east of bridge over Home 

Creek on road from Santa Anna to Whon. About 4.6 miles 

S. 39° W. of Trickham; about. 3.6 miles N. 23° E. of Whon. 

Collected by D. H. Eargle, Dec. 16, 1950.

$l)erk Mountain limestone member of the Thrifty formation

f 10025. Brown County. In pasture on slope of southwest-facing hill. Collection from shale 20-30 ft above dark-gray 

limestone. 0.8 mile east of Grosvenor, 0.35 mile east of 

crossroad. North of county road from Farm Road 279 to 

Grosvenor. Collected by D. H. Eargle, Nov. 13, 1950.

f!0063. Coleman County, Tex. Fusulinids rare in poorly exposed I 1/, ft of pale-yellowish-brown limestone near base of 

mountain. Type area of member. On northeast side of 

Speck Mountain, 4.6 miles N. 13° E. of Whon, 4.4 miles S. 

54° AV. of Trickham; southeast of junction of road from 

Trickham to AVhon (east-trending road) with road from 

Santa Anna to AYhon (north-trending road). Collected by 

D. H. Eargle, Oct. 28, 1951.

f!0064. Coleman County, Tex. In roadcut at east edge of 

Speck Mountain escarpment, on north side of road. 0.4

mile east of Mukewater School, 3.3 miles N. 10° AV. of 

Trickham. Collected by L>. H. Eargle, Jan. 9, 1952; by 

D. A. Myers and R. T. Terriere, Aug. 4, 1953.

f!0070. Coleman County, Tex. Algal ( ?) limestone containing 

fusulinids in zones toward the top of the outcrop. Bed of 

Camp Creek on Rockwood-AArhon road at point where road 

meets (but does not cross) creek. 2.8 miles east of junction of AValdrip road with U.S. Highway 283 in Rockwood; 

1.4 miles N. 65° AV. of AVhon on Rockwood-AVhon road. 

Collected by D. A. Myers and R. T. Terriere, Aug. 3, 1953.

f!0073. Coleman County, Tex. Speck Mountain limestone 

member in ditch along west side of Santa Anna-AVhon road 

just north of junction of road that goes due east from 

Trickham. 4.0 miles due west of Trickham. Collected by 

D. A. Myers and R. T. Terriere, Aug. 4, 1953.

Breckenriclge limestone member of the Thrifty formation

f!0053. Brown County, Tex. Very fossiliferous nodular limestone in small gully in flat at base of hill. On west edge of 

old Fry oil field, 3.8 miles N. 83° AV. of Thrifty, south of 

cemetery, at foot, of 60-ft hill. Collected by D. H. Eargle, 

Mar. 8, 1951; by D. A. Myers and R. T. Terrie-e, Nov. 18, 

1954.

f!0054. Coleman County, Tex. Limestone bed near south edge 

of Santa Anna oil field; 6.5 miles S. 73° E. of intersection 

of U.S. Highways 283 and 84 in Santa Anna : 1.1 miles east 

of intersection of secondary road with Farm Road 567, 

south of Santa Anna oil field. 0.4 mile north of this secondary road. Approximately 6 miles west-sonthwest of 

Bangs. Collected by D. H. Eargle and M. G. Cheney. 

March 1950.

f!0055. Brown County, Tex. Cross Plains quadrangle. In 

Cross Cut oil field, 2.6 miles S. 52° E. of Crops Cut. 2.3 

miles east along road between State Highway 279 at Cross 

Cut and Farm Road 583; and 1.75 miles south along a secondary road, where limestone goes beneath drainage in bed 

of intermittent stream. Collected by P. T. Stafford, Aug. 6, 

1952.

f 10056. Brown County. Tex. Cross Plains quadrangle, 3.3 miles 

S. 87° E. from Cross Cut, 0.5 mile due south of east-trending gravel road which junctions, 3.4 miles west, with paved 

road at Cross Cut. Collected from limestone where it goes 

beneath drainage in bed of intermittent stream. Collected 

by P. T. Stafford, Aug. 14, 1952.

Chaffln limestone member of the Thrifty formction

f!0019. Brown County, Tex. 6-in. bed of limestone about 15 ft 

below top of section on west edge of Fry oil field south of 

cemetery at bottom of 10-ft hill. About one-half of a mile 

east of Coleman-Brown County line; 0.9 mile south of Jim 

Ned Creek; south side of east-trending road. Collected by 

D. H. Eargle, Mar. 8, 1951; D. A. Myers and R. T. Terriere, 

Nov. 18, 1954.

f!0057. McCulloch County. Chaffin limestone member at old 

Chaffhi coal mine on Little Elni Creek in northeast McCulloch County, 1 mile east of AValdrip (preser^ site), 0.7 

mile south-southeast of ChafHn cemetery, 0.7 mile southwest of Chaffln crossing on the Colorado River. Type area 

of member. Collected by L. G. Henbest, D. H. E-rgle, R. C. 

Douglass, and D. A. Myers. Oct. 19, 1952.
STRATIGRAPHIC DISTRIBUTION OF PENNSYLVANIAN FUSULINIDAE FROM TEXAS 51

flOOTl. Coleman County, Tex. Outcrop of Chaffin limestone 

member in ditch on east-trending road about 300 ft east of 

Hay Creek, 4.4 miles X. 43° W. of Trickham; 2.2 miles west 

of Mukewater School along east-trending road. Collected 

by D. A. Myers and R. T. Terriere, Aug. 4, 1953.

fl()072. Coleman County, Tex. Near base of outcrop of Chaffin 

limestone member in ditch on east side of Santa AnnaWhon road. 4.2 miles N. 78° W. of Trickham, at north end 

of bend in road convex to west. Collected by D. A. Myers 

and R. T. Terriere, Aug. 4. 1953.

f 10079. Coleman County, Tex. Upper part of Chaffin on hillslope west of tank. 0.2 mile northeast of old house on 

bend in road; 6.0 miles S. 50° E. from intersection of U.S. 

Highways 67 and 84 with U.S. Highway 283 at Santa Anna. 

O.S mile northwest of Cleveland School. Collected by D. A. 

Myers and D. H. Eargle, May 12. 1953.

REFERENCES

Bullard, F. M., and Cuyler, R. H., 1935, The Upper Pennsylvanian and lower Permian section of the Colorado River 

valley, Texas: Texas Univ. Bull. 3501. p. 191-258 [1936].

Cheiiey. M. G., 1949, 1949 Field trip guidebook, Abilene Geological Society : Abilene, Texas. 46 p.

Cheney, M. G., and Eargle, D. H., 1951, Geologic map of Brown 

County, Texas: Texas Univ., Bur. Econ. Geology.

Dunbar, C. O., and Condra, G. E., 1927, The Fusulinidae of 

the Pennsylvaniaii system in Nebraska; Nebraska Geol. 

Survey, 2d ser., 135 p., 15 pis., 13 figs.

Dunbar, C. O., and Henbest, L. G., 1942, Pennsylvania!! Fusulinidae of Illinois: Illinois State Geol. Survey Bull. 67, 

218 p., 23 pis., 13 figs.

Eargle, D. Hoye, 1960, Stratigraphy of Penusylvanian and lower 

Permian rocks in Brawn and Coleman Counties, Texas: 

U.S. Geol. Survey Prof. Paper 315-D.

Lee, Wallace, Nickell, C. O., Williams, J. S., and Henbest, L. G., 

1938, Stratigraphic and paleontologic studies of the Pennsylvanian and Permian rocks in north-central Texas : Texas 

Univ. Pub. 3801, 252 p., 11 pis., 9 figs.

Moore, R. C., 1949, Rocks of Permian (?) age in the Colorado 

River valley, north-central Texas: U.S. Geol. Survey Oil 

and Gas Inv. Prelim. Map 80.

Myers, D. A., Stafford, P. T., and Burnside, R. J., 1956, Geology 

of the late Paleozoic Horseshoe atoll, west Texas: Texas 

Univ. Pub. 5607, 113 p.. 18 pis., 10 figs., 10 tables.

Newell, N. D., and Keroher, R. P., 1937, The fusulinid, WedekittfleUina, in mid-Peiinsylvanian rocks of Kansas and Missouri: Jour. Paleontology, v. 11, no. 8, p. 698-705, pi. 93.

Plummer, F. B., and Moore, R. C., 1921, Stratigraphy of the 

Pennsylvanian formations of north-central Texas: Texas 

Univ. Bull. 2132, 237 p., 27 pis., 19 figs. [1922].

Reeves, Frank, 1922, Geology of the Ranger oil field, Texas: 

U.S. Geol. Survey Bull. 736-E, p. 111-170 [1923].

Ross, C. S., 1921, The Lacasa area, Ranger district, northcentral Texas: U.S. Geol. Survey Bull. 726-G, p. 303-314.

Schellwien, E., and Staff, H. von, 1912, Die fusuliniden (Schell- 

\vienien) nordamerikas: Palaeontographica, v. 59, p. 157- 

192, pis. 15-20.

Schenk, E. T., and McMasters, J. H., 1936, Procedure in taxonomy : Stanford, Calif., Stanford Univ. Press, 72 p.

Stewart, W. J., 1958, Some fusulinids from the upi»er Strawn 

Pennsylvanian, of Texas: Jour. Paleontology, v. 32, no. 6 

p. 1051-1070, pis. 132-137, 2 text figs.

Terriere, R. T., (in press). Geology of the Grosvenor quadrangle, 

Brown and Coleman Counties, Texas: U.S. Geol. Survey 

Bull. 1096-A.

Thompson, M. L., 1934, The fusulinids of the Des Moines series 

of Iowa: Iowa Univ. Studies, Studies in natural history, v. 

16, no. 4, p. 277-322, pis. 20-23.

: 1936, Pennsylvanian fusulinids from Ohio : .Jour. Paleontology, v. 10, no. 8, p. 680-682, pi. 91.

 1945, Upper Desmoinesian fusulinids: Am. Jour. Sci., v. 

243, no. 8, p. 443-455, pis. 1-2.

 1957, Northern midcontinent Missourian fusulinids:

Jour. Paleontology, v. 31, no. 2, p. 289-325, pis. 21-30. 

White, M. P., 1932, Some Texas Fusulinidae: Texas Univ. Bull.

3211, p. 1-105, pis. 1-10. 

Zeller, D. E. N., 1953, Endothyroid foraminifera and ancestral

fusulinids from the type Chesteriau (Upper Mississippian) :

Jour. Paleontology, v. 27, no. 2. p. 183-199, pis. 26-28.

INDEX

Page 

Acknowledgments. . _-_-_--_---_________________.__._..___._____. ___________ 40

Adams Branch limestone member, Graford formation__________________ 40,42,43, 48

Age offusulinids-_- ___ _ __ __-_-________-.__..___ 37

BeUerophon bed. _ ___ ___ ____ ___ ___ __ _ 46

Bluff Creek shale member, Graham formation____..-____________________ 40,45,49

Brad formatioii________._-___- _____________________________ 40,42,43,44,48

Brazos River drainage basin_____________________________________________._ 38,42,45

Breckenridge limestone member, Thrifty formation. _ ---___.---_-______-___ 40,46,50

Brown wood shale member, Graford formation ______.__..__-___.__._____ 40, 42,43, 48

Bunger limestone member, Graham formation____________________________ 45

Caddo Creek formation..-..--________---_--_--...._..._._._._.____ 40,42,44,45,49

CampophyUum....................................... _______________ 45,49,50

Canyon group.___________________________________________________ 37,38,40,42-44,47

Capps limestone lentil____________________________________._-____ ________ 40,42,47

Cedarton shale member, Graford formation._____________________________ 40,42,43

Chaffln limestone member. Thrifty formation.____________________ 40,46,47,50,51

Clscogroup __-___ __ _ __ 37,38,40,42-47

Collecting localities.--------------_---_-_--__--_-_____________________________ 47-51

Colony Creek shale member, Caddo Creek formation_________-____.____..____ 40,44

Colorado River.. ____________________________________________________ 45,46,48

Colorado River drainage basin__._____________________________________________ 38

Correlation.________ _______________________________________________________ 37

Cretaceous rocks__________________________--_-_____-___________-_--__--__- 38

Distribution of Fusulinidae____.._-.__._________________________________ 40

Dunbarinella _-_--_------_--_______________________.____________ __ 44,45,46, pi. 24

ervinensis ____________._-_._____________________________ 40, 45, 46, pis. 9, 21

sp. A_.________________________________________________________________ 40, pi.18

sp. B__________________________________________________________________ 40, pi.22

sp. C_ _-_ _-__-_._-_-_-_._-_.__________________________________ 40, pi. 22

sp. D_______________________________________________________________ 40,47,pi.23

sp_ pi. 24

spp. 44,46

Fiisnlina ______________________________________________________________ 37,42,47

acme...... ............ ........ ............................... 40,pi. 15

wppsf»s.s____________________.__________ ___________________________ 40,pi. 15

eximici-.- ________ ._-_-_._________ _______________________ 40, pi. 15

megista............. ........................_____________ 40,pi. 15

r.cfc£rt«s/s__________________._________________________________ 40, 42, pis. 15,24

sp. A_____________________________________________________________________ Pl. 15

sp_-___-----_--_--_-_--_---_-__-_-----_-.___________________________ 40, pi. 15

Gonzales limestone of Ross___ _______________ _ ______________________________ 45

Graford formation._________________________________________________ 40,42,43,48

Graham formation.. __________________________________________________ 38,40,44-46

Gunsight limestone member, Graham formation______________________ 40,44,45,49

Home Creek__________________________________________________________________ 44,45

Home Creek limestone member, Caddo Creek formation_______________ 40,44,45,49

Home Creek time__________________________________.___.___________________ 44

Horseshoe Atoll._____________________________________________________________ 37

Ivan limestone member, Graham formation._________________________ 40,44,46,50

Karsanella neglectux. 40,43, pi. 16

osa</f..s.s___. ________________________________________________________ 40,43, pi. 16

Localities, description___________________._____________________________ ______ 47-51

Location of the area___--_-----------_--------_____________________________ 38

Methods of study ______________________-_-_--_--____-_._____________________ 38-40

Midland basin___.____________________________________________________________ 37,47

A/./7-rf.?a___ _________________________________________________________________ 43.44

sp_ _____ _ _ _ _ 40, 43, 45, pis. 17, 18, 24

528409 O 60 3

Page 

Mississippian time, Late.-.-..-- ____._____-____-_----__---_--___------- 37

Missouri series_______--_---_----___------------_-------------- ------ 43

North Leon limestone of Ree\es_ 45

Parks Mountain sandstone member, Thrifty formation... ..---.._. 46 

PeimsylvEfflian.--------------------------------------------------- 37,38,42,47

Permian ....-.----------------------------- --------- 37,42,44,47

Placid shale member, Brad formation___ ____ -_ _ _____ 40,43,44,48

Previous investigations.__-_--___--.-___--- -___ -__..-- ______-_---__-_ 38

Pueblo formation______--_---- ___--_------------------- - _ 38

Ranger limestone member, Brad formation, __-._-__- __ _._- 40,43,44,48 

Ranger time____--_______-----_----_------------------------------------------ 44

Ricker Station limestone of Cheney._._-_..._-. --. -------- 38,40,42,47

SchuberteUd-.... . -- -- 38,44,46,

kingi.... _ __ __ -- ------- ------- --

sp. A.. . 40,46,

sp_

Speck Mountain limestone member, Thrifty formation. _. -- _ 40,44,45, 

StaffeHa.--- 38,43,

sp---- _- - _ - - 40,43,45, pis. 17,

Stratigraphic distribution of the fusulinids 

Stratigraphy________________ ____ - - __-----_-_----___----------

Strawn group ___-.__ ___ __ _ - 37,38,40,42,

Strawn group undiflerentiated-.-___--_-___ ____ _ _____ _-_ _-__ 

Summary.-__--___---- ___- -___ ----- -_-_ - _ _____ 

pi. 24 

46

pi. 22 

pi. 2*' 

46,50 

44,45 

18,19 

42-47 

42

43,47

42,47

47

Thrifty formation.____-_-___--_-__-----------_------------------- 40,44,45,46-47

Triticites... 37,42,43,44,46,47, pi. 2''

beedei........ - 40,45,46,47, pis. 20,21,23

consobriiius.............................. ..... ...... 40,44,45,pis. 17,18, &

cuttomeiisis. ....._ . 40,44,45,46, pis. 17,18,19, V

irregutoris.--.. - . -- -- 40,43,pis. 16,17

moorej- - 40,47, pi. 23

nebraskensis..... ___________.-___----_- ____--_-__- __-__-.-- 40,43,pi. 16

wweHi - _ - -- -- 40,44,pi. 17

ohioeasis.. 40,43, pi. 16

or_/Z(/orrB.S--___-----------___-------------------------------------- 40,45,pi. 18

jAummeri 40,44,45,46,47,pis. 18,20,22,23

*«ca.ic«*... -- - 40,44,45,46, pis. 17,18,19,22,24 

subventricosm - --- 40,46,47, pis. 22, 23

ventricosus.... . .. - --- 40,44,45,46,47,pis. 18,19,20,21,22,23

ventricosus meeki......................... __---_____-- --------------- 46

sp. A________ _______-_- 40,44,pi. 17

sp. B_ 40,44, pi. 17

sp. C- _- - 40,44, pis. 17. 2.-

sp. D -. _ - - - - 40,44, pis. 17,24

sp. E................................ 40, pi. 17

sp. F_._-___-_----__--____^----------------------------------------- 40,45, pi.18

sp. G. . _ - .-.-_-- -- -- 40,45, pi. If 

sp.H-.- -. __ - - -- 40,45, pi. If 

sp. I. 40,45, pi. 2P

sp. J ._ _ 40,46,pi.21

.sp. K_ . 40,46, pi. 22

sp. L 40,46, pi. 22

sp. M.-.__ _ _._ ___ .- 47, pi. 2?

sp--._ pis. 19,24

Waldrip shale member, Pueblo formation..... 3?

Wayland shale member, Graham formation..__.___.__-.--------------- 40,44,45,50

Wedekindellina ultimata....-.........-..-..----.---. ---------------------- 4_

White Ranch limestone---.---.-.--------------------------------------------- 4£

Wichitagroup________-_-_--__-_.-___-_ -_ - -- 37,42,47

Winchelllimestone--.- ---- - --------- - - ---- 40,42,43,4?

Wolfcamp time___________________________--___--__------__-------- ----- 38,44

53

PLATES 15-24
PLATE 15

[All figures X 10. Scale of columnar section, 1 in=40 ft]

FIGURES 1-14. Fusulinidae from the Capps limestone lentil of Plummer and Moore (1921).

I-3. Fiisulina aff. F. acme Dunbar and Henbest, 1942.

1. USNM 120031, from USGS locality f 10027, slide 3.

2. USNM 120032, from USGS locality f!0027, slide 5.

3. USNM 120033, from USGS locality f!0027, slide 4. Type area of the Capps limestone lentil.

4. Fusulina sp. USNM 120034, from USGS locality f!0078, slide 1.

5. Fusulina sp. USNM 120035, from USGS locality f!0078, slide 2. 

6-7. Fusulina sp. A.

6. USNM 120036, from USGS locality f!0076, slide 2.

7. USNM 120037, from USGS locality f!0076, slide 3. 

8-9. Fusulina aff. F. megista Thompson, 1934.

8. USNM 120038, from USGS locality flOOOS, slide 2.

9. USNM 120039, from USGS locality f 10008, slide 1. 

10. Fusulina aff. F. eximia Thompson, 1934. USNM 120040, from USGS locality flOOOS, slide 5.

II-14. Fusulina cappsensis Stewart, 1958.

11. USNM 120041, from USGS locality f!0009, slide 6.

12. USNM 120042, from USGS locality f 10009, slide 1.

13. USNM 120043, from USGS locality f!0009, slide 3.

14. USNM 120044, from USGS locality f!0009, slide 4. 

15-21. Fusulinids from the Ricker Station limestone of Cheney (1949). 

Fusulina! rickerensis Thompson, 1945.

15. USNM 120045, from USGS locality f!0004, slide 8.

16. USNM 120046, from USGS locality f!0077, slide 1.

17. USNM 120047, topotype, from USGS locality flOOOS, slide 1.

18. USNM 120048, from USGS locality f!0004, slide 7.

19. USNM 120049, from USGS locality f!0004, slide 5.

20. USNM 120050, from USGS locality f 10077, slide 3.

21. USNM 120051, topotype, from USGS locality flOOOS, slide 3.
GEOLOGICAL SURVEY PROFESSIONAL PAPER 315 PLATE 15

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GEOLOGICAL SURVEY PROFESSIONAL PAPER 315 PLATE 16

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FUSULINIDAE FROM THE GRAFORD FORMATION
PLATE 16

[All figures X 10. Scale of columnar section, 1 in=40 ft]

FIGVRES 1-8. Fusulinids from the Adams Branch limestone member. 

1. Triticites ohioensis! Thompson, 1936, juvenile.

USNM 120052, from USGS locality f 10028, slide 1. 

2-4. Triticites ohioensis Thompson, 1936.

2. USNM 120053, from USGS locality f!0028, slide B-l.

3. USNM 120054, from USGS locality f!0028, slide 2.

4. USNM 120055, from USGS locality f!0028, slide 6. 

5-6. Kansanella cf. K. neglectus (Newell), 1934.

5. USNM 120056, from USGS locality flOOlS, slide 31.

6. USNM 120057, from USGS locality f!0013, slide 2. 

7 8. Kansanella ex gr. K. osagensis (Newell), 1934.

7. USNM 120058, from USGS locality flOOOl, slide 15.

8. USNM 120059, from USGS locality flOOOl, slide 20. 

9-17. Fusulinids from the Brownwood shale member. 

9-10. Triticites nebraskensis Thompson, 1934.

9. USNM 120060, from USGS locality f!0014, slide 4.

10. USNM 120061, from USGS locality f!0014, slide 5. 

11-12, 14 15. Triticites ex gr. T. irregularis (Schellwien and Staff), 1912.

11. USNM 120062, from USGS locality f 10030, slide 2.

12. USNM 120063, from USGS locality f!0030, slide 6.

14. USNM 120064, from USGS locality f!0032, slide 2.

15. USNM 120065, from USGS locality f!0032, slide 3. 

13. Triticites aff. T. irregularis (Schellwien and Staff), 1912.

USNM 120066, from USGS locality f 10031, slide 5. 

16-17. Triticites irregularis (Schellwien and Staff), 1912.

16. USNM 120067, from USGS locality f 10033, slide 2.

17. USNM 120068, from USGS locality f!0033, slide 3.
PLATE 17

[All figures X 10, unless otherwise Indicated. Scale of columnar section, 1 in=40 ft]

FIGURES 1-9. Fusulinids from the Home Creek limestone member of the Caddo Creek formation. 

1-2. Triticites aff. T. consobrinus White, 1932.

1. USNM 120069, from TJSGS locality f!0041, slide 1. Type area of member.

2. USNM 120070, from USGS locality f!0041, slide 5. Type area of member.

3. Triticites sp. A. USNM 120071, from USGS locality f!0041, slide 2. Type area of member.

4. Triticites sp. B. USNM 120072, from USGS locality f!0040, slide 5.

5. Staffella? sp. (X 30) USNM 120071, from USGS locality f!0041, slide 2. Type area of member.

6. Triticites sp. C. USNM 120073, from USGS locality f!0040, slide 2. 

7-9. Triticites cf. T. secalicus, (Say) 1833.

7. USNM 120074, from USGS locality f!0029, slide 1.

8. USNM 120075, from USGS locality f 10029, slide 6.

9. USNM 120076, from USGS locality f!0029, slide 5.

10-13. Fusulinids from the Ranger limestone member ot the Brad formation. 

10-11. Triticites sp. D.

10. USNM 120077, from USGS locality f!0037, slide 1.

11. USNM 120078, from USGS locality f 10037, slide 3.

12. Triticites cf. T. newelli Burma, 1942. USNM 120079, from USGS locality f 10038, slide 1.

13. Triticites cf. T. cullomensis Dunbar and Condra, 1927. USNM 120080, from USGS locality f!0039, slide 5. 

14-18. Fusulinids from the Placid shale member of the Brad formation.

14. 16, 18. Triticites sp. E.

14. USNM 120081, from USGS locality f!0035, slide 1.

16. USNM 120082, from USGS locality f!0035, slide 3. Juvenile specimen.

18. USNM 120083, from USGS locality f!0035, slide 2. Juvenile specimen.

15. Triticites cf. T. sp. B. USNM 120084, from USGS locality f 10036, slide 3. 

17. Triticites aff. T. newelli Burma, 1942. USNM 120085, from USGS locality f!0036, slide 1. 

19-25. Fusulinids from the Winchell limestone.

19-20, 22-24. Triticites ex gr. T. irregularis (Schellwien and Staff), 1912.

19. USNM 120086, from USGS locality flOOSl, slide 4.

20. USNM 120087, from USGS locality flOOSO, slide 5.

22. USNM 120088, from USGS locality flOOSl, slide 3.

23. USNM 120089, from USGS locality f 10080, slide 3.

24. USNM 120090, from USGS locality flOOSl, slide 1.

21. Millerellat sp. (X 30). USNM 120091, from USGS locality flOOSl, slide 5. 

25. Staffella? sp. (X 30). USNM 120092, from USGS locality f 10080, slide 6.
GEOLOGICAL SURVEY PROFESSIONAL PAPER 315 PLATE 17

FUSULINIDAE FROM THE WINCHELL, BRAD, AND CADDO CREEK FORMATIONS
GEOLOGICAL SURVEY PROFESSIONAL PAPER 315 PLATE 18

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FUSULINIDAE FROM THE BLUFF CREEK SHALE MEMBER OF THE GRAHAM FORMATION
PLATE 18

[All figures X 10, unless otherwise indicated. Scale of columnar section, 1 in=40 ft]

FIGUKES 1-3. Fusulinids from a shale bed just below the Gunsight limestone member.

1. Dunbarinella sp. A. USNM 120093, from USGS locality f!0052, slide 3. 

2-3. Triticites cf. T. oryziformis Newell, 1934.

2. USNM 120094, from USGS locality f!0052, slide 6.

3. USNM 120095, from USGS locality f!0052, slide 4.

4-9. Fusulinids from a limestone bed (Bunger limestone member of the Graham formation) in the upper part of the Bluff 

Creek shale member.

4. Triticites cf. T. plummeri Dunbar and Condra, 1927. USNM 120096, from USGS locality f!0042, slide 2.

5. Triticites aff. T. plummeri Dunbar and Condra, 1927. USNM 120097, from USGS locality f 10042, slide 3. 

6-8. Triticites cf. T. cullomensis Dunbar and Condra, 1927.

6. USNM 120098, from USGS locality f!0043, slide 1.

7. USNM 120099, from USGS locality f!0043, slide 4.

8. USNM 120100, from USGS locality f 10043, slide 3.

9. Triticites ex gr. T. ventricosus (Meek and Hayden), 1858. USNM 120101, from USGS locality f 10046, slide 1. 

10-18. Fusulinids from a group of limestone beds in the central part of the Bluff Creek shale member.

10. Triticites sp. F. USNM 120102, from USGS locality f!0045, slide 6.

11. Millerella? sp. (X 30) USNM 120103, from USGS locality f!0045, slide 1.

12. Staff dial sp. (X 30) USNM 120104, from USGS locality f 10050, slide 2. 

13-14, Triticites aff. T. secalicus (Say), 1833

13..USNM 120105, from USGS locality f 10045, slide 4.

14. USNM 120106, from USGS locality f 10045, slide 2. 

15. Triticites sp. G. USNM 120107, from USGS locality f!0050, slide 3. 

16-18. Triticites cf. T. sp. F.

16. USNM 120104, from USGS locality f!0050, slide 2.

17.. USNM 120108, from USGS locality f!0049, slide 2.

18. USNM 120109, from USGS locality f!0045, slide 3. 

19-23. Fusulinids from a group of limestones in the lower part of the Bluff Creek shale member.

19. Staffellal sp. (X 30). USNM 120110, from USGS locality f 10048, slide 2.

20. 22. Triticites cf. T. consobrinus White, 1932.

20. USNM 120111, from USGS locality f!0047, slide 2. 

22. USNM 120112, from USGS locality f!0047, slide A-l.

21. 23. Triticites cf. T. secalicus (Say), 1833

21. USNM 120113, from USGS locality f!0047, slide 1. 

23. USNM 120114, from USGS locality f!0047. slide A-4.
PLATE 19

[All figures X 10, unless otherwise indicated. Scale of columnar section, 1 in=40 ft]

FIGURES 1-5. Fusulinids from the upper part of the Gunsight limestone member.

1. Triticites aff. T. cullomensis Dunbar and Condra, 1927. USNM 120115, from USGS locality f!0061, slide 4. 

2-3. Triticites ex gr. T. ventricosus (Meek and Hayden), 1858

2. USNM 120116 from USGS locality f!0058, slide 1.

3. USNM 120117, from USGS locality flOOGl, slide 6.

4. Triticites sp. H. USNM 120118, from USGS locality f!0021, slide 1.

5. Triticites cullomensis Dunbar and Condra, 1927. USNM 120119, from USGS locality f 10021, slide 3. 

6-9. Fusulinids from the middle part of the Gunsight limestone member. 

6-7. Triticites ex gr. T. ventricosus (Meek and Hayden), 1858.

6. USNM 120120, from USGS locality f!0059, slide 6.

7. USNM 120121, from USGS locality f!0059, slide 5.

8. Triticites aff. T. cullomensis Dunbar and Condra, 1927. USNM 120122, from USGS locality f!0059, slide 3.

9. Staffellal sp. (X 30). USNM 120123, from USGS locality f!0059, slide 11. 

10-16. Fusulinids from the lower part of the Gunsight limestone member. 

10-11. Triticites cf. T. secalicus (Say), 1833.

10. USNM 120124, from USGS locality f!0069, slide 3.

11. USNM 120125, from USGS locality f!0067, slide 5.

12. Triticitesl sp. USNM 120126, from USGS locality f!0067, slide 6.

13. 16. Triticites aff. T. secalicus (Say), 1833.

13. USNM 120127, from USGS locality f!0060, slide 1. 

16. USNM 120128, from USGS locality f!0069, slide 2.

14. Triticites ex gr. T. ventricosus (Meek and Hayden), 1858. USNM 120129, from USGS locality f!0069, slide 6.

15. Dunbarinella cf. D. ervinensis Thompson, 1942. USNM 120130, from USGS locality f!0060, slide 2.
GEOLOGICAL SURVEY PROFESSIONAL PAPER 315 PLATE 19

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GEOLOGICAL SURVEY PROFESSIONAL PAPER 315 PLATE 20

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FUSULINIDAE FROM THE WAYLAND SHALE MEMBER OF THE GRAHAM FORMATION
PLATE 20

[All figures X 10. Scale of columnar section. 1 in.=40 ft.

FIGUEES 1-4. Fusulinids from the upper part of the Wayland shale member.

1. Triticites cf. T. beedei Dunbar and Condra, 1927. USNM 120131, from USGS locality f 10065, slide 5.

2. Triticites ex gr. T. ventricosus (Meek and Hayden), 1858. USNM 120132, from USGS locality f 10065, slide M-5.

3. Triticites aff. T. beedei Dunbar and Condra, 1927. USNM 120133, from USGS locality £10065, slide 1.

4. Triticites sp. I. USNM 120134, USGS locality f 10065, slide 2. 

5-10. Fusulinids from the lower part of the Wayland shale member.

5. 7. Triticites beedei Dunbar and Condra, 1927.

5. USNM 120135, from USGS locality f 10011, slide 3. 

7. USNM 120136, from USGS locality flOOll, slide 13.

6. 9. Triticites aff. T. beedei Dunbar and Condra, 1927.

6. USNM 120137, from USGS locality f!0066, slide 4.

9. USNM 120138, from USGS locality f 10066, slide 1.

8. Triticites plummeri Dunbar and Condra, 1927. USNM 120139, from USGS locality f 10011, slide 1. 

10. Triticites ex gr. T. ventricosus (Meek and Hayden), 1858. USNM 120140, from USGS locality f 10011, slide 15.
PLATE 21

[All figures X 10. Scale of columnar section, 1 in=40 ft]

FIGURES 1-4. Fusulinids from the upper part of the Ivan limestone member.

1. 4. Triticites aff. T. beedei Dunbar and Condra, 1927. 

1. USNM 120141, from USGS locality f!0026, slide 12. 

4. USNM 120142, from USGS locality f!0026, slide 8.

2. 3. Triticites aff. T. ventricosus (Meek and Hayden) meeki (Moller), 1879.

2. USNM 120143, from USGS locality f!0026, slide 2.

3. USNM 120144, from USGS locality f!0026, slide 10. 

5-9. Fusulinids from the middle part of the Ivan limestone member.

5. Dunbarinella cf. D. ervinensis Thompson, 1942. USNM 120145, from USGS locality fl0012; slide 8.

6. Triticites sp. J. USNM 120146, from USGS locality f!0012, slide 6.

7. Triticites aff. T. beedei Dunbar and Condra, 1927. USNM 120147, from USGS locality f!0012, slide 10.

8. Triticites aff. T. cullomensisf Dunbar and Condra, 1927. USNM 120148, from USGS locality f 10012, slide 5.

9. Triticites ex gr. T. ventricosus (Meek and Hayden), 1858. USNM 120149, from USGS locality f!0012, slide 4. 

10-12. Fusulinids from the lower part of the Ivan limestone member. 

10-11. Triticites aff. T. beedei Dunbar and Condra, 1927.

10. USNM 120150, from USGS locality f!0062, slide 4.

11. USNM 120151, from USGS locality f!0062, slide 2. 

12. Triticites ex gr. T. ventricosus (Meek and Hayden), 1858 USNM 120152, from USGS locality f 10062, slide 1
GEOLOGICAL SURVEY PROFESSIONAL PAPER 315 PLATE 21

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GEOLOGICAL SURVEY PROFESSIONAL PAPER 315 PLATE 22

Chaffin 

limestone

Breckenridge/ 

limestone

Speck 

Mountain" 

limestone

FUSULINIDAE FROM THE SPECK MOUNTAIN AND BRECKENRIDGE 

LIMESTONE MEMBERS OF THE THRIFTY FORMATION
PLATE 22

[All figures X 10, unless otherwise indicated. Scale of columnar section, 1 in=40 ft]

FIGURES 1-6. Fusulinids from the Breckenridge limestone member.

1. Triticites sp. K. USNM 119882, from USGS locality f!0055, slide 3-A.

2. Triticites plummeri Dunbar and Condra, 1927. USNM 119884 from USGS locality f!0053, slide 16.

3. 6. Triticites aff. T. subventricosus Dunbar and Skinner, 1937. 

3. USNM 120153, from USGS locality f!0056, slide 2

6. USNM 120154, from USGS locality f!0056, slide 1.

4. Triticites sp. L. USNM 120155, from USGS locality f 10054, slide 3.

5. Triticites ex gr. T. secalicus (Say), 1833. USNM 120156 from USGS locality f!0055, slide 4-B. 

7-15. Fusulinids from the Speck Mountain limestone member.

7-8. Triticites ex gr. T. ventricosus (Meek and Hayden), 1858.

7. USNM 120157, from USGS locality f!0025, slide 3.

8. USNM 120158, from USGS locality f 10025, slide 6. 

9-10, 14. Triticites plummeri Dunbar and Condra, 1927.

9. USNM 120159, from USGS locality f!0025, slide 8.

10. USNM 120160, from USGS locality f!0074, slide 1. 

14. USNM 120161, from USGS locality f!0063, slide 4.

11. Dunbarinella sp. B. USNM 119891, from USGS locality f 10070, slide 4.

12. Triticites ex gr. T. secalicus (Say), 1833. USNM 120162, from USGS locality f!0025, slide 4.

13. Schubertella sp. A. (X 30). USNM 119894, from USGS locality f 10064, slide 4. 

15. Dunbarinella sp. C. USNM 119893, from USGS locality f!0064, slide 1.
PLATE 23

[All figures X 10. Scale of columnar section, 1 In=40 ft]

FIGURES 1-3. Triticites cf. T. subventricosus Dunbar and Skinner, 1937.

1. USNM 120163, from USGS locality f!0071, slide 4.

2. USNM 120164, from USGS locality f!0071, slide 3.

3. USNM 120165, from USGS locality f 10071, slide 2. 

4, 6, 9. Triticites aff. T. beedei Dunbar and Condra, 1927.

4. USNM 120166, from USGS locality f!0072, slide 2. 

6. USNM 120167, from USGS locality f!0019, slide 6.

9. USNM 120168, from USGS locality f 10057, slide 34. Type area of member. 

5, 12. Triticites plummeri Dunbar and Condra, 1927.

5. USNM 120169, from USGS locality f!0019, slide 16.

12. USNM 120170, from USGS locality f!0057, slide 39. Type area of member.

7. Triticites aff. T. moorei Dunbar and Condra, 1927. USNM 120171, from USGS locality f!0019, slide 4.

8. Triticites sp. M. USNM 120172, from USGS locality f!0079, slide 2. 

10 11. Triticites ex gr. T. ventricosus (Meek and Hayden), 1858.

10. USNM 120173, from USGS locality f!0057, slide 44. Type area of member.

11. USNM 119869, from USGS locality f 10057, slide 10. Type area of member. 

13. DunbarinelM sp. D. USNM 119868, from USGS locality f!0057, slide 22. Type area of member.
GEOLOGICAL SURVEY PROFESSIONAL PAPER 315 PLATE 23

Chaff in limestone

Breckenfidge 

limestone

Speck MountainX 

limestone

L

FUSULINIDAE FROM THE CHAFFIN LIMESTONE MEMBER OF THE THRIFTY FORMATION
GEOLOGICAL SURVEY PROFESSIONAL PAPER 315 PLATE 24

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MISCELLANEOUS FUSULINIDAE FROM THE PENNSYLVANIAN OF 

BROWN AND COLEMAN COUNTIES, TEXAS
PLATE 24

[All figures X 10, unless otherwise indicated. Columnar data supplied by R. T. Terriere. Scale of columnar section, 1 in=40 ft]

FIGURES 1-3. Fusulinids from the Ricker Station limestone of Cheney (1949) and the Speck Mountain limestone member of the 

Thrifty formation.

1. Fusulina? rickerensis Thompson, 1945. (X 5). USNM 120174, from USGS locality f 10004, slide X. This 

figure shows the abundance in which fusulinids are sometimes found. From the Ricker Station limestone of 

Cheney (1949).

2. Triticites sp. associated with Schubertella sp. (X 7.5). USNM 120175, from USGS locality f!0064, slide X. The 

Schubertella is the very small, imperfectly oriented fusulinid above and slightly to the left of the tunnel of 

Triticites. From the Speck Mountain limestone member of the Thrifty formation.

3. Dunbarinella sp. associated with Schubertella sp. (X 7.5). USNM 119891, from USGS locality f 10070, slide 4. 

The Dunbarinella is also shown on pi. 8, fig. 11. The Schubertella may be found in the middle of the photograph, just below the upper margin. From the Speck Mountain limestone member of the Thrifty formation. 

4-16. Fusulinids from the Ranger limestone member of the Brad formation and the Colony Creek shale member and Home

Creek limestone member of the Caddo Creek formation.

The fauna illustrated in figs. 4-13 contain elements that are found in the Home Creek and Ranger limestone members 

elsewhere in the area. The fauna more nearly resembles that of the Home Creek than it does that of the Ranger.

4. 9, 11, 12. Triticites aff. T. consobrinus White* 1932. 

4. USNM 120176, from USGS locality f 10075, slide 30. 

9. USNM 120177, from USGS locality f!0075, slide 26.

11. USNM 120178, from USGS locality f 10083, slide 2

12. USNM 120179, from USGS locality f!0083, slide 3.

5. Triticites aff. T. sp. C. USNM 120180 from USGS locality f 10075, slide 17.

6. Triticites sp. USNM 120181, from USGS locality f!0075, slide 27.

7. 8, 10. Triticites aff. T. secalicus (Say), 1833.

7. USNM 120182, from USGS locality f!0075, slide 23.

8. USNM 120183, from USGS locality f 10075, slide 33. 

10. USNM 120184, from USGS locality f!0075, slide 37.

13. Triticites cf. T. sp. D. USNM 120185, from USGS locality f 10083, slide 1. 

14-16. The fusulinids figured here more closely resemble those found elsewhere in the Ranger limestone member.

14. Triticites sp. USNM 120186, from USGS locality f!0082, slide 3.

15. Millerella! sp. (X 30). USNM 120187, from USGS locality f!0082, slide 4.

16. Triticites sp. USNM 120188, from USGS locality f!0082, slide 2.

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