GEOLOGICAL SURVEY CIRCULAR 296

THE CORED SECTION IN 

GEORGE VASEN'S FEE 

WELL 1, STONE COUNTY 

MISSISSIPPI
UNITED STATES DEPARTMENT OF THE INTERIOR 

Douglas McKay, Secretary

GEOLOGICAL SURVEY 

W. E. Wrather, Director

GEOLOGICAL SURVEY CIRCULAR 298

THE CORED SECTION IN GEORGE VASEN'S FEE WELL 1 

STONE COUNTY, MISSISSIPPI

By Paul L. Applin and Esther R. Applin

Washington, D. C.,1953

Free on application to the Geological Survey, Washington 25, D. C.
THE CORED SECTION IN GEORGE VASEN'S FEE WELL 1 

STONE COUNTY, MISSISSIPPI

By Paul L. Applin and Esther R. Applin

CONTENTS

 Page

Introduction................................. 1

Previous work .......................... 1

Acknowledgments....................... 1

Stratigraphy ................................ 3

Lower Cretaceous...................... 3

Hosston(?) formation .............. 3

Upper Jurassic......................... 3

Cotton Valley group................ 3

Cotton Valley( ?) group 

and Buckner( ?) 

formation. ...................... 4

Page

Stratigraphy C ontinued

Upper Jurassic Continued

Snaackover formation............... 5

Jurassic (undifferentiated) ............... 5

Smackover(?) and preSmackover( ?) formations ......... 5

Pre-Smackover.................... 5

Core descriptions............................ 5

Gas and oil showings .................... 6

Paleontology............................ 6

Lithology................................ 7

ILLUSTRATIONS

Page

Plate 1. Log from samples of cored section in George Vasen's Fee well 1,

Stone County, Miss........................................................... Inside back cover

Figure 1. Outline map of Mississippi showing location of George Vasen's Fee well 1...................... 2

INTRODUCTION

George Vasen's Fee well 1 (sec. 9, T. 2 S., 

R. 11 W.), about 3 miles northeast of Wiggins, 

Stone County, Miss. (fig. 1), in June 1951 reached . 

a total depth of 20,450 feet in rock salt of preSmackover (Jurassic) age. TheVasen Fee well 1 

is the deepest test in the Gulf Coast and, at its 

total depth, lacks 71 feet of equaling the record of 

20, 521 feet attained in 1949 by the Superior Oil Co. 

Unit 1 well, Sublette County, Wyo. Not only does 

this interesting and important test rank second in 

depth among the world's borings, but a gas showing 

at about 20,300 feet is the deepest on record. The 

information obtained from nearly 5, 500 feet of consecutive cores of unmetamorphosed Jurassic strata 

in the lower part of the Vasen test provides data on 

the stratigraphy of the Jurassic rocks of the Gulf 

Coastal Plain. Situated less than 50 miles north of the 

Gulf of Mexico on the regional subsurface structure 

commonly called the Wiggins anticline, the Vasen 

test penetrated Jurassic rocks at the farthest downdip location in the central Gulf Coast. Showings of 

oil and gas were found in the limestone and dolomite 

of the Smackover(?) formation.

Previous work

The well was started in August 1946 by Tom 

McKinney who drilled to 11, 209 feet. George Vasen 

continued the well to its total depth. In December 

1947, the test reached the depth of 14, 038 feet where 

an electric log was made and 7-inch casing set. In 

January 1950, diamond-bit coring began at 14,670 feet, 

and subsequently 197 consecutive cores penetrated 

5,771 feet of sedimentary strata to the depth of 

20,441 feet. Milling and fishing for lost parts of the 

diamond-bit added 9 feet, bringing the final depth of the 

well to 20, 450 feet. A core composed of 1 foot of 

anhydrite "and 1 foot of rock salt was recovered in 

a basket core barrel from the 9-foot interval. No 

electric log was made of the cored section. Bottomhole temperature of 389 F was recorded by engineers 

of Halliburton Oil Welt Cementing Co.

Acknowledgments

George Vasen and members of his staff at 

Wiggins, Miss., were most cooperative in facilitating 

the core study. Representatives of Core Laboratories,
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Figure 1. Outline map of Mississippi showing location of George Vasen's Fee well 1.

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Inc., and the members of the drilling crew provided 

assistance in arranging, boxing, and sampling the 

cores. J. D. Normally, geologist, Gulf Refining Co., 

Laurel, Miss., provided helpful information relating 

to problems of Jurassic stratigraphy in the Gulf Coast 

region.

Ralph W. Imlay conducted paleontologic studies 

of fossiliferous cores from the Vasen well and also 

collected fossils from cores between the depths of 

18,767 and 19,314 feet. The age classification of 

most of the stratigraphic units used herein are based 

on his reports.

STRATIGRAPHY 

Lower Cretaceous 

Hosston(?) formation

Starting at the depth of 14,670 feet, the upper 

275 feet of the cored section is tentatively classified, 

on the basis of lithology, as a part of the Hosston formation. Samples available for examination begin at 

14,722 feet; from that depth to 14,945 feet the samples 

are composed mainly of unfossiliferous hard dark 

brownish-red shale that is irregularly silty, micaceous, 

and calcareous. The red shale is partly mottled and 

streaked with gray to greenish-gray silty micaceous 

shale and contains a few small inclusions or blebs of 

red limestone. The lithology of these possible Hosston 

strata and the absence of fossil remains indicate 

deposition in a fresh- to brackish-water environment.

Upper Jurassic 

Cotton Valley group

It is difficult to select the top of the Cotton Valley 

group in the Vasen well owing to the lack of a definite 

stratigraphic break. The Hosston and the upper part 

of the Cotton Valley are closely similar in appearance. 

However near the depth of 14,945 feet the predominantly 

brownish-red color of the shale in the Hosston changes 

gradually in downward sequence to a darker and duller 

shade of red, and lenses of sandstone and siltstone 

increase in number and thickness. With progressive 

increase in depth, the strata show additional lithologic 

and f aunal characteristics that suggest a correlation 

with known Cotton Valley deposits penetrated in other 

wells in the central Gulf Coast. From the foregoing 

considerations, the top of the Cotton Valley group is 

questionably placed at 14,945 feet. A pronounced 

lithologic and faunal break in the samples at the depth 

of 16,998 feet marks the base of the beds that are 

correlated with the Cotton Valley, giving the interval 

a possible thickness of 2, 053 feet.

The Cotton Valley group in the Vasen well is 

separable into two parts on the basis of differences in 

lithology and faunal content. Approximately the upper 

three-fourths of the Cotton Valley interval is composed 

largely of nonmarine or deltaic deposits with rare 

occurrences of interbedded strata containing marine 

fossils; the lower one-fourth is composed of marine 

deposits containing beds that are abundantly fossiliferous.

From the depth of 14,945 feet to about 16, 475 feet, 

shale and sandstone in nearly equal proportions comprise the samples of the upper chiefly nonmarine part 

of the Cotton Valley. Beds of hard, compact dark 

brownish-red shale with a lesser amount of dark-gray 

shale alternate and interlens with many layers of gray, 

greenish-gray, grayish-red, and red sandstone. Silt 

and mica are irregularly and unevenly distributed in 

the shales, the mica occurring as finely disseminated 

particles and as thin partings or laminations composed 

of distinct flakes. The lime content of the shales ranges 

from noncalcareous to highly calcareous. In many 

places, the cores of red shale are mottled greenish 

gray or bluish green, and a few lenses of highly 

micaceous carbonaceous black shale are present at 

widely spaced levels. The sandstones, for the most 

part, are dense, fine to medium grained, micaceous, 

and calcareous to noncalcareous; scattered lenses of 

sandstone are moderately coarse grained and conglomeratic, containing irregularly-shaped fragments of 

shale and limestone. At irregular intervals in the core 

samples of the upper part of the Cotton Valley sequence, 

red silty limestone and gray limestone occur as nodules or blebs in the shale and, in places, as thin 

strata or lenses. Shale and sandstone in half a dozen 

scattered cores contain fragments of lignite and shreds 

of carbonaceous material, some of which show definite 

wood structure. Tom McGlothlin, consulting geologist, 

Laurel, Miss., made an independent study of the cores 

from the upper part of the cored section and reported 

(personal communication to Ralph W. Imlay, April 6, 

1950) that thin seams or laminae of coal occurred in a 

sample from the depth of 15,870 feet; Imlay reported 

(personal communication to Tom McGlothlin, May 3, 

1950) the occurrence of coal in the core from the depths 

of 16,116 to 16,143 feet. Imlay stated that the presence 

of coal and coaly beds and the occurrence of a few 

specimens of marine fossils in the cores from 16,170 to 

16, 224 feet are suggestive of a Cotton Valley rather 

than a Hosston age assignment. Small amounts of 

anhydrite are present in 3 cores. In core.36, at the 

depth of 15,605 feet, red and blue-green mottled silty 

shale contains 1 fragment of pink anhydrite; a sample 

of core 61, at 16, 273 feet, shows finely granular white 

anhydrite filling small crevices in gray sandy limestone; the middle fraction of core 66 is a dense sandstone in which a small amount of anhydrite is a component 

of the intergranular cement.

In the lower marine portion of the Cotton Valley 

group, roughly two-thirds of the samples from 16, 475 to 

16,998 feet are composed of dark shale, the remaining 

one-third being chiefly interbedded sandstone with lesser 

amounts of limestone and brownish-red shale. At several different levels in the 500-foot interval, the cores 

contain abundant specimens of megascopic fossils representing a variety of genera; fragmentary fossils are 

numerous, and a few cores yield ostracodes and charophytes. The hard, compact shale is mostly dark gray, 

greenish gray or olive gray, frequently mottled and 

streaked with brownish red; a few-cores contain relatively thin strata of brownish-red shale. The shales 

are calcareous to noncalcareous, usually micaceous, 

silty or finely sandy, and frequently fossiliferous. 

The sandstones are hard, dense,fine to medium grained, 

and usually light colored, gray or greenish gray; they 

are calcareous to noncalcareous, micaceous, and contain numerous streaks and irregular thin seams of black 

carbonaceous shale. A few sandstone cores contain
megascopic fossils and fossil fragments: Relatively 

thin strata of fossiliferous gray sandy and shaly limestone occur at irregular intervals in the marine portion 

of the Cotton Valley. Lignite and carbonaceous material are fairly common constituents of the core samples; 

in some cores the lignite fragments are cut by calcite 

veinlets that form a distinctive reticulate pattern. Two 

cores contain traces of anhydrite. In the middle fraction of core 84, anhydrite is possibly the cementing 

material of a dense gray sandstone; the occurrence of 

a single bleb of pink anhydrite in core 72 was mentioned 

in a report by McGlothlin.

Imlay reports that some of the fossil species 

occurring in cores between the depths of 15,647 and 

16,695 feet are identical or closely comparable with 

species in the Malone formation of West Texas. Imlay 

argues that since "the Malone formation corresponds 

to the Kimmeridgian and Portlandian stages of Europe, 

and is younger than the Smackover limestone of the 

southern states, it seems most probable that the 

fossiliferous beds in question [in the Vasen well] represent some part of the Jurassic younger than the 

Smackover. " Supporting the Cotton Valley age classification of the fossiliferous beds, Imlay points out 

the close similarity of some of the species in the 

Vasen well to forms in the lower part of the Cotton 

Valley group of the Arkansas-Louisiana-East Texas 

area; to species from the depths of 11, 492 to 

12,369 feet in the Danciger Oil and Refining Co. 's 

York well 1 (sec. 1, T. 7 N., R. 1 W.), Clarke County, 

Ala.; and to species from the depths of 11,803 to 

12, 083 feet in the Union Producing Co. 's Waite 

well I 2 (sec. 27, T. 8N., R. 1W.), Clarke County, Ala. 

In explanation of the discrepancy between the published stratigraphic section of the Waite well and the correlation with 

the Vasen test presented in this report, Imlay stated, "This 

correlation implies that the salt beds in the Union-Waite 

well are of Buckner rather than of Eagle Mills age and it 

alters considerably some published stratigraphic concepts."

Imlay further reports that none of the species between 

the depths of 15,647 and 16,695 feet in the Vasen well resemble the described species from the limestone of the 

Smackover formation.

Cotton Valley(?) group and 

Buckner(?) formation

From the depth of 16,998 to 18,695 feet, nearly 

1, 700 feet of unfossiliferous apparently nonmarine sediments are composed mostly of brownish-red, light-gray, 

and greenish-gray sandstone with interbedded layers of 

brownish-red and some dark-gray shale. Sandstone comprises, roughly, two-thirds of the interval, and shale about 

one-third; the upper 200 feet is mainly red shale, but, below 

the depth of 17, 200 feet, sandstones predominate. The red 

and gray sandstones are hard, dense very fine to moderately 

coarsegrained, frequently argillaceous, and usually calcareous and micaceous. Pink feldspar and light-green 

chlorite{ ?) grains are common constituents of the sandstone, and prominent highly micaceous lenses and partings 

are a distinctive characteristic of this portion of the cored 

section in the Vasen well. Occasional sandstone lenses are 

conglomeratic in appearance owing to included fragments 

and blebs of shale and limestone. The shales are hard, 

compact, usually calcareous, micaceous, and silty

Unpublished data in the files of R. W. Imlay, U. S. Geological Survey, 

Washington, D. C.

2Imlay, R. W., 1943, Jurassic formations of Gulf region: Am. Assoc. 

Petroleum Geologists Bull., v. 27, p. 1446.

or finely sandy; in the upper part of the interval, 

the red shale is frequently mottled with gray green 

and bluish green. The top part of core 112, at the 

depth of 17,606 feet, contains a thin bed of impure 

sandy limestone; scattered blebs and nodules of limestone occur in several other cores. Shreds of carbonaceous material and lignite fragments are fairly 

common in the sandstone and shale cores at many 

levels. Abundant, small even-sized black pellets of 

magnetite(?) occur in the top part of core 132, at the 

depth of 18,142 feet, and in a few deeper cores. Occurrences of anhydrite are rare and are confined to 

scattered blebs in cores 138 and 139 between the depths 

of 18, 304 and 18, 358 feet.

The age of the unfossiliferous red sandstones and 

shales between the depths of 16,998 and 18,695 feet has 

not been definitely determined although the upper and 

lower boundaries of the lithologic unit are clearly defined. The sharp Iitholo0c change separating the unit 

from the overlying dark marine deposits suggests an 

unconformable contact although more conclusive physical evidence, such as gravel beds or a conglomerate, 

is lacking. At the base of the red sand and shale interval, a fault of unknown displacement apparently 

marks the contact with the underlying Smackover formation. Near the middle of core 152, a section of the 

core broke along a slickensided surface cutting at a 

high angle across horizontal bedding and marking an 

abrupt change in lithology between the predominantly 

red nonmarine section above and dark marine sandstone and shale below. Cores of the shale and sandstone below the fault contain fossils characteristic of 

the Smackover. The stratigraphic position of the unfossiliferous red interval, underlying beds of 

Cotton Valley age and resting onbeds of Smackover age, 

suggests a correlation with the lower portion of the 

Cotton Valley, and, in part, with the stratigraphic 

equivalent of the Buckner formation. According to 

this interpretation, however, the typical anhydrite 

and salt beds of the Buckner are absent, due possibly 

to a change of facies, truncation, or nondeposition on 

the Wigglns anticline.

Based on the study of cuttings and electric logs 

of deep wells in north Louisiana, particularly wells 

in the Haynesville field, Claiborne Parish, La., and 

Columbia County, Ark., and the East Haynesville field, 

Claiborne Parish, La., the Shreveport Geological Society 

proposed the name Haynesville formation3 for a stratigraphic unit overlying the Smackover formation and 

underlying "a distinct break in the nature of a major unconformity within the Cotton Valley formation. " According 

to the Shreveport Geological Society classification,4 "the 

term Cotton Valley as a formation [is] restricted to the 

gray sands and shales lying above the unconformity, " 

and the name Haynesville formation is "introduced for 

the red sands, shales, and anhydrite lying below the unconformity and above Smackover formation. The stratigraphic equivalent of the Buckner formation of Arkansas 

would, in the north Louisiana area, be the basal member 

of the Haynesville formation. " The current usage by 

some oil company geologists has extended the term 

Haynesville formation to beds in Mississippi and Alabama, 

where it is applied to aunit comprising the Buckner formation and the lower part of the Cotton Valley group.

"Philpott, T. H.,and Hazrard, R. T., 1949, Preliminary correlation 

chart-upper Gulf Coast: Shreveport [La.J Geol. Soc. Guide Book, 17th 

annual fisld trip. Goebel, L. A., 1950, Cairo Field, Union County, Ark.: 

Am. Assoc. Petroleum Geologists Bull., v. 34, p. 1978-1979.

4Goebel, L. A., 1950, idem.
In the Vasen well, the interval composed of unfossiliferous red sand and shale, already discussed 

in this report, is tentatively correlated as the stratigraphic equivalent of atdeast a part of the so-called 

Haynesville formation.

Smackover formation

Between the depths of 18,695 and about 18,800 feet, 

a sequence of thinly interbedded, dark sandstone, siltstone, and shale is classified as the upper part of the 

Smackover on the basis of species of fossils occurring 

in cores 152, 154, and 155. The thickness of the interval is 105 feet. For the most part, the siltstones and 

dense fine-grained sandstones are dark gray, micaceous, 

and calcareous, with occasional greenish-gray and 

bluish-green lenses. The hard dark-gray, black, and 

brownish-black shales contain varying amounts of silt, 

mica, and carbonaceous material. In core 155, between the depths of 18,770 and 18,775 feet, thin beds 

of siltstone and black shale dip at angles ranging from 

25° to 60°, the steep dips indicating possible association with nearby faults.

Imlay (personal communication to Paul Applin) 

reports that the dark shales and sandstones contain 

fossil species that he has described from the upper 

part of the limestone of the Smackover formation. He 

further reports, "In particular, Astarte qrubbi Imlay. 

noted at the depth of 18,767 feet, is common in the 

upper oolitic part of the Smackover in Arkansas. "

Jurassic (undifferentiated)

Smackover(?) and pre-Smackoverf?') formations

The sequence of limestone, dolomite, and anhydrite from about 18,800 to 20,420 feet is questionably 

assigned, in this report, to the middle and lower parts 

of the Smackover, with the possibility that older Jurassic formations are also represented. In connection 

with the study of specimens collected from the limestone and dolomite, Imlay (personal communication 

to Paul Applin, March 20, 1953 (reported, "The fossils*** below the depths of 18,800 feet are definitely not 

older than Jurassic, but it is not possible to state what 

part of the Jurassic they represent. They belong to 

species different from any that I have described from 

the Cotton Valley formation or the upper part of the 

Smackover formation and are therefore probably of a 

different age. Very few fossils have been obtained 

from the middle and lower parts of the Smackover 

that might be used for comparative purposes with 

those in the lower part of the Vasen well below 

18,800 feet."

At the depth of 20,420 feet, in core 196, a foot 

of gray silty or very finely sandy micaceous clay 

marks the contact between the overlying dolomite 

and limestone sequence and the underlying anhydrite 

and salt which are the deepest rocks penetrated in the 

Vasen test.

Below the depth of 18,800 feet the almost uniformly 

dark brownish-gray limestones, dolomitic limestones, 

and dolomites are hard, dense, and finely granular,

usually breaking with a sharp conchoidal fracture 

but sometimes in platy fragments. A porous zone 

penetrated in cores 191 and 192, near the depth of 

20,300 feet, is discussed in succeeding paragraphs. 

Oolitic zones of varying thickness and zones of fragmental fossils are scattered at different levels in the 

limestone and dolomite sequence. Thin strata and . 

lenses of hard, brittle black and brownish-gray shale 

are particularly abundant below 19,800 feet. Between 

the depths of 18,800 and 19, 550 feet, beds of anhydrite, 

ranging in thickness from a foot to more than 30 feet, 

comprise nearly one-third of the interval; anhydrite 

blebs and inclusions are common in the limestone and 

dolomite portion. The bedded anhydrite is usually 

gray or white, dense, and impure, containing irregular 

veins, seams, and inclusions of black shale and darkbrown dolomite. Anhydrite blebs and inclusions persist 

in the limestone below 19, 550 feet, but anhydrite beds 

are absent. Small blebs of free sulfur occur near the 

top-of core 181 at about 19,815 feet, and again in core 

189 at the depth of 20,177 to 20; 187 feet.

Pre-Smackover

Underlying the thin stratum of silty or very finely 

sandy clay at the depth of 20,420 feet, 1-8| feet of gray 

crystalline anhydrite was recovered in the bottom part 

of core 196. No recovery was obtained in core 197 

from the depth of 20,437 to 20,441 feet. From approximately 20,445 to 20, 447 feet, a basket core recovered, 

in downward sequence, 1 foot of anhydrite and 1 foot of 

clear white rock salt. The foot of anhydrite in the basket core is similar in appearance to the anhydrite recovered in the bottom part of core 196. The crystalline 

anhydrite in the bottom cores of the Vasen well differs 

noticeably in appearance from the dense impure anhydrite in the cores from higher levels.

Imlay (personal communication to Paul Applin, 

March 20, 1953) reports that "the fauna! evidence for 

considering the salt at the bottom of the Vasen well 

as pre-Smackover consists (1) of the presence of fossils at depths of about 18,750 to 18, 800 feet that are 

found in Arkansas in the upper part of the Smackover 

limestone, and (2) of fossils at depths of 15,600 to 

17,000 feet that are found in Arkansas and Louisiana 

in the lower part of the Cotton Valley formation."

CORE DESCRIPTIONS

In August 1950, the authors were assigned to 

make lithologic and paleontologic studies of the cores 

from the Vasen well. We arrived in Wiggins, Miss., 

August 18, 1950, at the time that core 126 was being 

cut. Representatives of Core Laboratories, Inc., 

stationed at the well since coring started in January 

1950, had described and tested cores 1 to 125, from 

14,670 to 17,982 feet, preserving samples of the 

top, middle, and bottom parts of each core. These 

fractions were subsequently examined during the 

course of our work. Cores 126 to 196, from 17,982 to 

20,437 feet, were examined and sampled at the well 

by Paul L. Applin. In place of designating the 

fractional parts of the core as top, middle, and 

bottom, beginning with core 132 , at 18,142 feet, the 

log shows, so far as practicable, the actual depths of 

the lithologic changes. Samples of all cores were
studied microscopically and described by Esther R. 

Applin. When the studies were completed, the core 

samples and fossil specimens that had been collected 

were deposited with the Geological Survey, Washington, D. C.

Gas and oil showings

On March 2, 1951, during the process of cutting 

core 191 in the Vasen test at the depth of 20, 298 feet, 

gas having a strong odor of hydrogen sulfide blew 

oil-base drilling fluid from the well to the height of 

20 or 25 feet above the derrick floor. In the 2-hour 

interval following the initial showing, the well made 

3 or 4 additional heads, each lasting several minutes 

and acting in a manner similar to the first one.

Core 191 cut 21 feet of beds from 20, 277 to 

20, 298 feet, of which 12 feet were recovered when 

the core barrel was pulled several days after the 

gas showing. As recorded in the section on "Lithology, " 

the recovery from core 191 consisted of 4 feet of hard 

black dolomitic(?) shale in the top portion, followed, 

in sequence, by 4 feet of dense black dolomite and 

4 feet of dark-gray dolomite containing fragments of 

unidentified brachiopods and irregularly scattered 

small pores apparently resulting from the removal of 

microfossils. Similar pore spaces occurred in darkgray dolomite in core 192. The driller's foot-by-foot 

record of coring time for core 191 shows that at the 

depth of 20, 284 feet the coring time of 20 minutesper-foot dropped to 15 minutes-per-foot, followed 

by a further decrease to 10 minutes-per-foot at 

20, 285 feet. From 20, 285 to 20, 294 feet, the rate 

varied between 10 and 15 minutes-per-foot, increasing to 20 and 30 minutes-per-foot from 20, 294 to 

20, 298 feet.

The pore spaces in the dark-gray dolomite in 

cores 191 and 192 were the first and only local area 

of porosity observed in the cored section. The pores,

considered in connection with the interval of relatively 

soft drilling in core 191, lead to the conclusion that 

the heads of gas came from the dolomite at or near the 

depth where the showing occurred.

The oil showings in Vasen Fee well 1 are apparently indigenous and occurred as films of light oil 

on the surface of fresh fractures in dolomitic limestone and dolomite. The film of oil evaporated 

rapidly after exposure to the air. The highest showing 

occurred in core 165 at the depth of about 19, 215 feet; 

the deepest showing was in core 194 at about 20,360 feet.

Most of the oil showings associated with fractures 

are scattered at irregular intervals between the depths 

of 19, 215 feet and 19,660 feet. The showings at the 

different levels are frequently concentrated in about 

4 or 5 feet of a core and are separated by apparently 

barren intervals that range in thickness from a few 

feet to about 50 feet. Below the depth of 19,660 feet, 

the showings occur less frequently and are more 

widely spaced. Based on observation of the cores, 

and without the benefit of chemical tests, the showings 

just described apparently are not related to or derived 

from the oil-base drilling mud.

Paleontology

Specimens of megascopic fossils and ostracodes 

occurring in cores from the Vasen well were studied 

in Washington. Ralph W. Imlay reported on mollusks, 

crustaceans, and brachiopods; I. G. Sohn reported on 

the ostracodes. G. Arthur Cooper, U. S. National 

Museum, Washington, D. C., studied and reported 

on several of the brachiopod specimens. The paleontologic studies show that the sediments in which the 

fossils occur are definitely not older than Jurassic. 

The list that follows gives the names of the fossils 

that were identified in the different cores, the core 

numbers, and the depths at which the fossils occurred.

Core 

no.

38

45

58

59

74

75

76

77

81

 J.52

154

Depth 

(feet)

15,647

15,823-15,850

bottom

16, 170-16, 197

bottom

16, 197-16, 224

top

16, 204

16,597-16,624

middle

16,624-16,651

middle

16,651-16,678

top

middle

bottom

16,695

16,786-16,813

bottom

18,702

18, 707-18, 708

18,749-18,750

Fossils

Lopha SP.

Cvzicus (= Estheria) sp.

Astarte (Coelastarte) cf . Aj, rathieri Loriol.

Gastropod, undetermined.

Isocvprina sp. , Eocallista SP. , Quenstedtia cf . Q. weeksi Imlay, Trapezium?

cf . T. subtricronum Imlay, Tancredia sp. , Grammatqdon? sp.

Volsella sp. , Voj.sella? sp. , Extogyra cf. E^ potosina Castillo and Aguilera,

Pteroperna? sp., Paraovpris? r Gomphoc vthere ? . undetermined Ostracoda, Charophytes

Cvzicus (aEstheria^ sp..

Ostracoda, undetermined.

Lopha SP.

Cvzieus (= Estheria) spp. , Tancredia sp., Schuleridea?, |sp. aff . Paracvpris Swain.

Exogyra cf . E^ virgula fDefraneeVr Chlamvs SP.. ammonite, lateral lappet.

Exogvra? sp.

Exogvra, cf. E^ virgula (Def ranee).

"CvtherQis" SP. 1. Cvtheridea, s. 17, Cvpridea s. 1? Ostracoda, undetermined.

Gastropod, undetermined, "Cvthereis". sp. 2, Illiocypris?

QyzAcus (= Estherial SP. f "Cvthereis" sp. 2?, Cvtheridea s. 1?

Lucina sp.
Core 

no.

155

157

158 

163 

166 

167 

184 

185 

191

Depth 

(feet)

18,767 

18, 768 

18, 769 

18,774 

18,770-18,776 

18,782-18,788 

18,788-18,791 

18,812 

18,816 

18,811-18,818 

18, 824 

18,821-18,826 

18, 827 

18, 866 

19,081-19,086 

19, 266-19, 276 

19,314 

19,942-19,990 

19,990-20,040 

20, 277-20, 298

Fossils

Astarte grubbi Imlay, Triaonia sp. , Coelastarte sp. , Corbicellopsis sp. 

Entolium sp. 

Perisphinctid ammonite 

Cercomva? sp. 

Astarte?. Tancredia? . Eocallista? 

Lucina sp. , Entolium sp. 

Corbicellopsis?. Tancredia? . Gervillia. Entolium. 

Pleuromva sp. 

Isocvprina?. Quensted.^?

Exogvra sp. juv. 

Tancredia?

Exogvra sp. juv. , Cyzicus (= Estheria ) sp.

Cvzicus (= Estheria) sp.

Isocvprina? sp. 

Terebratulid brachiopod.

Chlamvs (Camptochlamvs'). brachiopod fragments. 

Rhynchonellid and terebratulid brachiopods, .Sphaera SP. , undetermined pelecypod. 

Brachiopod fragments.

Lithologv

Full recovery was obtained for each core taken 

in the Vasen well except as stated otherwise on the 

graphic log (pi. 1) and in the lithologic descriptions 

given below. In cores having less than 100 percent

recovery, the lithologic symbols representing the 

recovered fraction are shown on the graphic log beginning at the top of the core; space proportionate to 

the unrecovered fraction is shown by the symbol for 

"No samples" in the lower part of the core.

Lithologic description of cores

Core 

no.

Depth 

(feet) Description

14,670-14,696 

14,696-14,722 

14,722-14,748

14,748-14,774

14,774-14,800

14,800-14,825

14,825-14,851

14,851-14,877

14,877-14,904

No samples.

No samples.

Top. Shale T brownish- red, hard, silty, calcareous, highly and finely micaceous. 

Middle . Shale, dark brownish- red, calcareous, somewhat finely micaceous. 

Bottom. Shale , dull dark brownish- red, hard, calcareous, highly and finely micaceous; 

contains a few small red limestone inclusions.

. Shale, dark brownish- red, calcareous, finely micaceous.

. Shale, dark-gray, silty, slightly- calcareous, micaceous, slightly carbonaceous. 

Bottom. Shale , dark brownish- red, calcareous, finely micaceous.

Top. Shale, as in bottom of core 4.

Middle. Shale, like bottom of core 4, dark-red with a few small bluish-gray to green

patches. 

Bottom. Shale, dark brownish-red, moderately hard, calcareous, highly and finely

micaceous.

Top. Shale, dull dark- red with some greenish-gray mottling, highly calcareous, marly. 

Middle. Shale, like top with gray mottling in about 50 percent of sample; highly silty. 

Bottom. Shale, dark brownish-red, hard, highly calcareous, sparsely and finely micaceous.

Top. Shale; lenses of dark- red shale, similar to bottom of core 6, and hard slightly calcareous gray shale. 

Middle and bottom. Shale, dark brownish-red, hard, calcareous, finely micaceous.

Tjjp. Shale, like middle and bottom of core 7, containing a few small sandstone inclusions. 

Middle.. Shale, dark brownish- red, irregularly streaked and spotted with greenish- gray

highly silty shale; both shales micaceous and highly calcareous. 

Baitojn. Shale, dark brownish-red, somewhat silty, sparsely and finely micaceous.

Top- Shale, dark brownish-red, hard, somewhat finely micaceous.

Middle and bottom. Shale, dark brownish- red, calcareous, highly and finely micaceous.
Lithologic description of cores Continued

Core 

no.

Depth 

(feet)

Description

14,904-14,930

14,930-14,956

14,956-14,982

14,982-15,008

15,008-15,034

15,034-15,060 

15, 060-15, 087

15,087-15,114

15,114-15,141 

15,141-15,167

15,167-15,193 

15,193-15,219 

15,219-15,245

Top. Shale, dark brownish-red, somewhat darker and duller than core 9, slightly calcareous, very finely micaceous. 

Middle and bottom. Shale, like top; many small slickensided areas.

Top. Shale, dark brownish- red, hard, calcareous, highly and finely micaceous; a few

small greenish- gray silty areas.

Middle. Shale, dark brownish- red, slightly calcareous, sparsely and finely micaceous. 

Bottom. Silts tone, grayish- red, hard, dense, calcareous, finely micaceous, containing

lenses of dull dark brownish- red shale.

Top. Siltstone and shale, thinly and irregularly interbedded. Gray calcareous highly 

micaceous siltstone. Dark brownish- red highly silty and micaceous shale.

Middle. Shale, dark brownish- red, calcareous, finely micaceous.

Bottom. Sandstone, grayish- red, hard, dense, calcareous, very highly micaceous along 

parting planes.

Top. Shale, dark brownish-red with a few small greenish-gray areas, hard, irregularly

silty, calcareous, highly and finely micaceous. 

Middle. Shale, dark brownish-red mottled with greenish- gray, micaceous; contains

dark-red irregular limestone areas. 

Bottom. Shale, dark-gray, interbedded with thin lenses of dark- red shale. The darkgray shale is highly micaceous, contains thin irregular lenses of lighter gray dense

calcareous siltstone.

Top. Sandstone, light-tan to gray, fine- to medium -grained, calcareous; contains lenses 

of highly micaceous greenish-gray sandstone. Conglomeratic appearance due to irregular 

areas of dark-gray shale and greenish-gray silty limestone.

Middle. Shale, dark brownish- red, hard, highly silty and micaceous, calcareous.

Bottom. Shale, dark brownish- red, hard, highly and finely micaceous.

No samples.

Top, middle, and bottom. Sandstone, dark grayish- red, hard, medium-grained to conglomeratic, highly calcareous.

Top. Sandstone, light reddish-gray, medium-grained to moderately coarse grained,

highly calcareous, micaceous. 

Middle. Shale and sandstone lenses containing scattered flakes of colorless mica and

many fragments of lignite. Dark brownish- red slightly calcareous slightly micaceous

shale. Light-gray dense calcareous sandstone; conglomeratic appearance due to irregular patches of dark-gray carbonaceous shale. 

Bottom. Shale as in middle of core. At 15, 097 ft, a lense of micaceous dense medium -

grained white conglomeratic sandstone contains many irregular hard gray shale inclusions and pebbles of dark-gray limestone.

TOP, middle, and bottom. Shale, dark brownish-red, silty, highly and finely micaceous.

. Shale, dull dark brownish- red, slightly sandy, highly micaceous. 

Middle. Shale, dark brownish- red, irregularly sandy, highly calcareous and micaceous. 

Bottom. Sandstone, dark grayish- red, dense, fine-grained, calcareous.

TOP. Shale T dark brownish- red, hard, micaceous.

Middle. Limestone, dark- red, hard, shaly.

Bottom. Sandstone, grayish- to dark- red, fine-grained, calcareous, micaceous.

. Sandstone, dark grayish-red, hard, dense, medium-grained, calcareous, micaceous. 

Middle. Shale, dark brownish- red; slickensided areas. 

Bottom. Shale, dark brownish-red, hard, silty, somewhat finely micaceous.

Top. Shale, dark brownish- red, slightly calcareous, highly and finely micaceous.

Middle. Shale, dark-gray, highly micaceous especially on parting planes; contains irregular

streaks of greenish-gray calcareous highly micaceous sandstone. 

Bottom . Shale and sandstone. Dark-red smooth- textured noncalcareous somewhat finely

micaceous shale. Light greenish-gray dense fine- to medium -grained highly calcareous

micaceous sandstone.

8
Lithologic description of cores Continued

Core 

no.

Depth 

(feet)

Description

23

24

25

26

27

28

29

30

31

32

33

34

35

15, 245-15, 271

15, 271-15, 298 

15,298-15,324

15,324-15,350 

15,350-15,376

15,376-15,402 

15, 402-15,429

15,429-15,456 

15,456-15,483

15,483-15,510 

15, 510-15, 534

15,534-15,560 

15,560-15,586

Sandstone, dull grayish-red, dense, fine-grained, shaly, highly calcareous, micaceous.

Middle. Sandstone, greenish-gray, dense, medium-grained, calcareous, micaceous with 

many copper-colored flakes.

Bottom. Shale, dark brownish-red, slightly calcareous, micaceous.

Top. Sandstone, gray, fine- to medium-grained, calcareous, highly micaceous; many

thin shaly dark-gray very highly micaceous partings.

Middle. Shale, gray, hard, silty or very finely granular, none ale are ous, micaceous. 

Bottom. Shale, brownish-red, noncalcareous, micaceous.

Tap.. -Sandstone, brownish-red, dense, micaceous, irregularly streaked with highly calcareous red shale.

Middle. -Shale, dark brownish-red, highly silty and calcareous, somewhat finely micaceous.

Bottom.-Sandstone, light-gray, hard,'fine-grained, calcareous; laminated with many thin 

very highly micaceous partings.

Top. Shale, red, noncalcareous, slightly micaceous. 

Middle. Sandstone, shaly, red, medium-grained, micaceous.

Bottom.-Similar to middle part but more highly micaceous, somewhat coarser grained, 

and slightly calcareous.

TOP. -Sandstone, light reddish-tan, hard, medium-grained, slightly calcareous, micaceous with many highly micaceous irregular partings. 

Middle.-Shale, red, slightly calcareous, finely and highly micaceous. 

Bottom. Shale, brownish-red, hard, dense, calcareous.

Tjjp.-Sandstone, shaly, grayish-red, fine-grained, calcareous, micaceous. 

Middle. -Shale, dark-red, irregularly silty, slightly calcareous, finely micaceous. 

Bottom. -Sandstone, shaly, light brownish-red, fine-grained, highly calcareous, micaceous.

Top. Sandstone, red, hard, fine-grained, argillaceous, calcareous, micaceous. 

Middle. -Shale, dark-red with a few small gray-green mottlings, slightly calcareous,

slickensided. 

Bottom. ~Shalef red, silty to highly sandy; contains blue-green sandy areas in which

sand is fine-grained, calcareous, and micaceous.

Top. Shale, red, highly micaceous with a few small greenish-blue or gray sandy areas.

Middle. Shale, red, silty, calcareous, micaceous.

Bpttom. Sandstone, light-red, fine-grained, argillaceous, calcareous, micaceous.

Top. Shale, red, hard, noncalcareous.

Middle.-Sandstone, light greenish-gray, hard, medium-grained, argillaceous, highly

calcareous, with very highly micaceous partings. 

Bottom. Shale, sandy, dark brownish-red, micaceous. Fine- to medium-grained slightly

calcareous sand.

Toor middle r and bottom. Shale, dark brownish-red, hard, calcareous, very highly 

micaceous.

TOP. -Shale, dark reddish-brown, silty, slightly calcareous, highly micaceous.

Middle. Shale and sandstone. Dark-gray noncalcareous micaceous shale with irregular 

dark brownish-red streaks. Red hard moderately coarse grained argillaceous highly 

calcareous micaceous sandstone.

Bottom. Sandstonef light-red, hard, medium-grained, argillaceous, calcareous, micaceous; contains a thin lens of light greenish-gray sandstone, moderately coarse grained, 

calcareous, and micaceous.

Top. Sandstoner light greenish-gray as in bottom of core 33.

Middle. Shale, sandy, dark brownish-red, slightly calcareous, micaceous.

Bottom.-Sandstone, shaly, dark-red, hard, highly calcareous, micaceous.

TJJB. Sandstone, red, fine- to medium-grained, slightly calcareous with a few irregular 

red shale inclusions.

Middle. Shale, red, silty, micaceous with very highly micaceous partings.

Bottom. Sandstone, light-gray, dense, medium-grained to moderately coarse grained, 

highly calcareous; conglomeratic appearance due to inclusions of lignite, black carbonaceous shale, and hard gray-green siltstone.
Lithologic description of cores Continued

Core 

no.

Depth 

(feet) Description

15,586-15,612

15,612-15,638

15,638-15,664

15,664-15,691

15,691-15,718

15,718-15,745

15,745-15,770 

15,770-15,797

15,797-15,823 

15,823-15,850

15,850-16,876

15,876-15,902

15,902-15,929

Top. Siltstone. greenish-gray, hard, calcareous.

Middle. Sandstone, light greenish-gray, very dense (quartzitic),- fine- to medium-grained,

calcareous. 

Bottom. Shale, red, unctuous, with some greenish-blue mottling. At 15,604ft, shale

similar to above but highly silty, contains a thin layer of greenish-gray cryptocrystalline

limestone. At 15,605 ft, red and blue-green mottled silty to sandy shale, contains one

fragment of pink anhydrite.

Top. Shale, dark reddish-brown, hard, silty, none ale areous, micaceous. 

Middle. Similar to top of core, but highly and finely sandy, highly micaceous. 

Bottom. Shale, red with small blue-green mottlings, contains calcite inclusions and irregular areas of red limestone.

TOP and middle. Shale, dark brownish-red, hard, slightly calcareous and micaceous.

Bottom. Sandstone and shale. Grayish-red hard medium-grained highly calcareous, 

micaceous sandstone. Dark-gray hard shale, with thin lenses of greenish-gray micaceous sandstone and a lens of dark brownish-red sandy highly calcareous micaceous 

shale. At 15,647 ft, dark-gray hard shaly limestone contains fossil fragments and 

nearly complete bivalve shells; a lens of dark brownish-red hard shale shows a large 

slickensided surface.

TOP. Shale, dark brownish-red, irregularly gray-green mottled, silty, with a few irregular 

areas of red dense fine-grained sandstone.

Middle. Shale, dark brownish-red, calcareous, finely micaceous.

Bottom. Sandstone, grayish-red, dense, coarse-grained, highly calcareous, thickly and 

irregularly streaked and spotted with red shale fragments giving a conglomeratic appearance; contains a lens of dark-gray hard noncalcareous shale.

TOP. Sandstone and shale. Sandstone, white, dense, hard, highly calcareous, slightly

micaceous.

Middle. Shale, dull reddish-brown, hard, slightly calcareous. 

Bottom. Shale, brownish-red, hard, silty, noncalcareous, highly and finely micaceous.

Top. Shale, like bottom of core 40.

Middle. Shale, red, slightly and finely micaceous.

Bottom. Shale, red,, slightly calcareous, highly and finely micaceous.

TOP, middle, and bottom. Shale, red, finely sandy, calcareous, micaceous.

Top. Like core 42.

Middle. Sandstone, reddish-brown, very dense, fine- to medium-grained, highly calcareous, micaceous, with many thin very highly micaceous red shale partings. 

Bottom. Shale, red, calcareous, micaceous, with irregular highly sandy layers.

TOP, middle, and bottom. Shale, reddish-brown, hard, noncalcareous, somewhat micaceous.

TOP. Sandstone, light-gray, very dense, fine-grained, quartzitic, calcareous. 

Middle. Shale, brownish-red with greenish-gray mottling, hard, highly silty; contains

irregular areas of red limestone. 

Bottom. Shale, dark brownish-red, hard, slightly calcareous, finely micaceous.

TOP. Shale, dark-red, calcareous, sparsely and finely micaceous.

Middle. Sandstone, gray, moderately coarse grained, highly calcareous, micaceous, with 

lenses of highly micaceous black shale. Irregularly shaped inclusions of black micaceous 

shale give sandstone a conglomeratic appearance.

Bottom. Shale f dark-red, silty, slightly calcareous, micaceous; contains a few questionable impressions of fossils.

TOP. Shale, like bottom of core 46, but highly silty and more micaceous.

Middle. Shale, dark brownish-red, silty, slightly calcareous, micaceous.

£ojiojn. Shale, red with greenish-gray mottling, slightly calcareous, finely micaceous.

T_pjj. Shale, dark-red, finely micaceous.

Middls.. Sandstone, grayish-red, moderately hard, fine-to medium-grained, argillaceous, 

highly calcareous, micaceous.

Bjjiipjn. Sandstone, light-gray, calcareous, micaceous, with many paper-thin very highly 

micaceous lenses andpartings. At 15,907ft, light-gray dense moderately coarse grained 

calcareous micaceous sandstone, containing athin lens of highly carbonaceous black shale.

10
Lithologic description of cores Continued

Core 

no.

Depth 

(feet) Description

49

50

51

52

53

54

55

56

57

53

59

60

15,929-15,955

15,955-15,982

15,982-16,009

16,009-16,035 

16,035-16,062

16, 062-16, 089

16,089-16,116

16,116-16,143

16,143-16,170

16,170-16,197

16,197-16,224 

16,224-16,251

Top. Sandstone, like bottom of core 48; a few thin highly micaceous lenses and scattered

blebs of black shale. 

Middle. Shale and shaly sandstone, irregularly interbedded. Black micaceous shale.

Dull dark-brown slightly calcareous finely micaceous sandstone. 

Bottom.--Shale, dark brownish-red, silty, slightly calcareous, very highly and finely

micaceous.

Top. Shale and sandstone. Shale is in part, dark brownish-red, hard, dense, and noncalcareous and in part, dark-gray sandy noncalcareous and micaceous. Light greenishgray dense moderately coarse grained sandstone, with many thin lenses or partings of 

mica in a small amount of shale. At 15, 956 ft, hard highly micaceous sandstone.

Middle. Shale, dark brownish-red, moderately hard, micaceous.

Bottom. Shale and sandstone. Dark brownish-red highly silty and very finely micaceous 

noncalcareous shale. Gray hard highly micaceous sandstone with many thin partings. 

Another part of core is composed of light greenish-gray dense fine- to medium-grained 

shaly micaceous sandstone.

Top. Shale , dark brownish-red, silty, noncalcareous, highly micaceous.

Middle. Sandstone and shale. Lenticular light-gray and red dense fine- to medium-grained

argillaceous noncalcareous micaceous sandstone. Gray hard sandy irregularly bedded

shale; contains fragments of lignite showing wood structure. 

Bottom. Shale, dark brownish-red, noncalcareous, highly and very finely micaceous.

TOP, middle, and bottom. Shale, as in bottom of core 51.

Top. Shale, dark brownish-red, hard, highly silty and micaceous, noncalcareous.

Middle. Shale or shaly sandstone, dark-gray, hard, noncalcareous, laminated with many 

thin lenses of mica.

Bottom. Sandstone, light-gray, coarse-grained, calcareous, micaceous, with thin irregular inclusions of black micaceous shale.

Top. Sandstone, light-gray, hard, dense, fine-grained, argillaceous, noncalcareous, 

with irregular lenticular partings of mica flakes.

Middle. Shale, in part, dark brownish-red, hard, noncalcareous, micaceous; in part, 

dark-gray, micaceous, with thin lenses of very dense noncalcareous dark greenish-gray 

sandstone.

Bottom. Shale and conglomeratic sandstone. Dark brownish-red shale. Hard, dense 

fine-grained calcareous conglomeratic sandstone, containing many large nodular inclusions of black shale and brownish-gray limestone with one bleb of white calcite.

Top. Sandstone and shale. Gray fine-grained calcareous sandstone. Dark-gray noncalcareous shale.

Middle. Shale, dark brownish-red, irregularly silty, noncalcareous, micaceous. 

Bottom. Shale, red, dense, slightly and finely micaceous.

Top. Shale, like bottom of core 55.

Middle. Sandstone, conglomeratic, white, fine-grained, calcareous, with abundant irregular nodules of red shale, a few of black shale, and a few of red limestone. 

Bottom. Shale T dark brownish-red, hard, noncalcareous, finely micaceous.

Top. Shale , like bottom of core 56.

Middle. Shale, hard, highly silty, noncalcareous, micaceous. 

Bottom. Shale T dark brownish-red with small greenish-gray mottlings, 

noncalcareous.

TOP and middle. Shale, like bottom of core 57. 

Bottom. No sample.

No samples.

Top. Sandstone, gray, dense, medium-grained, slightly micaceous and carbonaceous,

 chloritic(7); contains lenses of hard highly and finely sandy somewhat micaceous gray shale.

Middle. Sandstone, gray, dense, medium-grained, chloritic(?), micaceous with moderately 

large mica flakes; contains scattered inclusions of gray shale and lenses of finely sandy 

highly and finely micaceous dark brownish-red shale. At 16, 237 ft, black micaceous irregularly silty shale, with many carbonized plant fragments and some pyritic inclusions.

Bottom. Sandstone, greenish-gray, dense, medium-grained, micaceous; contains scattered 

grains of ablue-green waxy-textured material, irregular inclusions of brownish-black shale, 

and thin partings of highly micaceous dark-gray shale.

11
Lithologic description of cores Continued

Core 

no.

Depth 

(feet) Description

61

62

63

64

65

67

68

70

71

16,251-16,277

16,277-16,303

16,303-16,330

16,330-16,356 

16,356-16,383

16,383-16,410

16, 410-16, 437

16,437-16,464

16,464-16,489

16,489-16,516

16,516-16, 543

Top. Siltstone, greenish-gray, hard, with irregular inclusions and lenses of highly/micaceous finely sandy reddish-brown gray-mottled shale.

Middle. Sandstone, greenish-gray, dense, fine-grained, micaceous, thickly and irregularly 

streaked with thin seams of carbonaceous brownish-black and brownish-red shale. At 

16, 273 ft, gray finely sandy micaceous limestone, with occasional green grains and fragments of calcite; contains impressions of fossil bivalves; a few small crevices filled with 

finely granular white anhydrite.

Bottom. Sandstone and sandy limestone, gray, dense, slightly micaceous; contains molds 

of fossil bivalves and a small amount of anhydrite in crevices.

TOP. Sandstone, gray, hard, dense, medium -grained, micaceous.

Middle . Shale, dark brownish- red, micaceous.

Bottom. Shale, like above, with lenses of dense medium -grained micaceous greenish-gray

sandstone containing many small light blue-green shaly grains and peach-colored quartz(?)

grains.

TOP. Sandstone, light greenish-gray, dense, medium -grained, micaceous. 

Middle Shale, black, hard, with small fragments of carbonaceous material. 

Bottom. Shale, dark brownish-red, micaceous.

Top, middle, and bottom. Shale, dark brownish- red, highly micaceous.

TOP. Shale, dark brownish-red with irregular small greenish-gray areas, micaceous. 

Middle . Sandstone, light greenish-gray, dense, fine- to medium-grained, slightly

micaceous. 

Bottom. Shale, dark brownish-red, micaceous, showing slickensided surf ace$.

TOP. Sandstone, brownish-gray, dense, fine-grained, micaceous, with occasional

peach-colored grains; a small amount of blue-green shaly matrix. 

Middle. Sandstone and siltstone. Light-gray dense medium -grained slightly micaceous

pyritic sandstone; a few areas cemented with white finely granular anhydrite(?). Gray

micaceous siltstone. 

Bottom. Shale, dark brownish-red, micaceous.

TOP. Sandstone, brownish- red, dense, micaceous, irregularly and thickly streaked with

highly micaceous brownish- red shale. 

Middle . No samples. 

Bottom. Shale and sandstone, interlaminated. Gray highly micaceous shale. Fine- to

medium -grained shaly sandstone.

Tqp. Siltstone, gray, hard, slightly micaceous.

Middle. Shale and sandstone. Dark brownish-red medium -grained sandy micaceous shale.

Brownish-red medium-grained argillaceous micaceous sandstone. 

Bottom. Sandstone, like above, containing moderately hard medium-grained argillaceous

micaceous light greenish-gray lenses.

Tqp. Shale and siltstone. Dark brownish- red and gray noncalcareous slightly micaceous 

shale, with gray-green mottling. Light greenish-gray siltstone. Another part of core 

is composed of gray-green unctuous shale, with small slickensided surfaces.

Middle . Shale, dark brownish- gray, silty, micaceous, with scattered carbonaceous 

fragments.

Bottom. Shale, gray, hard, noncalcareous.

. Shale, gray with irregular dark streaks, somewhat .silty; contains lenses of hard, 

dense gray sandstone, with irregular thin streaks of black carbonaceous shale.

Middle. Sandstone and shale. Gray hard, dense fine-grained sandstone, with many 

carbonaceous fragments. Dark-gray micaceous shale.

EoJiojEn. Shale, gray, hard, granular-textured, calcareous, micaceous, with irregular 

silty areas.

Tqp. Shale, dark-gray, containing thin veinlike streaks of lignite cut by calcite veinlets in a

crosshatched pattern. 

Middle. Limestone and sandstone. Dark-gray slightly sandy limestone, with impressions of

fossil fragments. Light-gray dense fine- to medium -grained micaceous sandstone, with

irregular thin streaks of shale. 

Bottom. Shale, greenish-gray with brownish- red mottling, unctuous, irregularly micaceous.

12
Lithologic description of cores Continued

Core 

no.

Depth 

(feet) Description

72

73

74

75

76

77

78

79

80

81

82

83

16,543-16,570

16, 570-16, 597

16,597-16,624

16,624-16,651

16,651-16,678

16,678-16,705

16,705-16,732

16,732-16,759

16,759-16,786

16,786-16,813

16,813-16,840

16,840-16,866

No sample. Tom McGlothlin, consulting geologist, Laurel, Miss. , studied the core and 

described it as a greenish-gray silty micaceous shale containing a single fragment of 

pink anhydrite.

TOP. Shale, gre'enish-gray with brownish- red mottling, hard.

Middle. Sandstone , light-gray, dense, medium-grained, argillaceous.

Bottom. -'Limestone, gray, shaly, dense, hard, with fragments of fossil bivalves.

TOP. Limestone, dark-gray, shaly, with fragments of iossil bivalves.

Middle. Shale, gray-green or olive, unctuous, with small convex rounded holes of

organic(?) origin and fragmental molds of fossil bivalves. 

Bottom. Shale T dark-gray, highly calcareous, with many fragments of fossil bivalves.

Top, middle, and bottom. Shale , dark-gray, hard, calcareous, -containing ostracodes 

and many fragments of fossil bivalves and echinoid spines.

TOP. Shale, dark reddish-brown, calcareous, abundantly fossiliferous.

Middle. Shale , dark-gray, calcareous, with a few fossil fragments.

Bottom. Shale , dark-gray, calcareous, with abundant fossils and fossil fragments.

TOP and middle. Shale, dark-gray, calcareous, with abundant fossil fragments. 

Bottom. Shale, dark-gray, hard, silty, with finely fragmental fossils.

TOP. Shale, dark-gray, calcareous, with molds and fragments of fossils.

Middle. Shale, greenish-gray or olive-gray with irregular red-brown mottling, unctuous,

none ale areous. 

Bottom. Sandstone, dark-gray, hard, fine-grained, argillaceous, calcareous, micaceous,

thinly and irregularly streaked with black shale.

TOP. Sandstone, dark-gray, hard, dense, micaceous, pyritic, with fragments of fossil

bivalves, and veins of lignite cut by many reticulate calcite veinlets. 

Middle. Shale, dark-gray, micaceous, none ale areous, finely carbonaceous, containing

lenses of light-gray dense fine-grained micaceous calcareous sandstone with many

comminuted carbonaceous fragments. 

Bottom. Shale, dark-gray, sandy, micaceous, with lenses of gray dense fine-grained sandstone; occasional fossil fragments.

Top. Shale, gray, hard, silty, with a few fossil fragments and shreds of carbonaceous

material. 

Middle. Shale, dark-gray, hard, fine-grained, noncalcareous, with shreds of carbonaceous

material. 

Bottom. Shale, like aoove, with a few fragments of fossils and fossil impressions.

TOP. Shale, dark-gray, micaceous, irregularly and thinly laminated with silty to finely

sandy lenses; carbonaceous fragments. 

Middle. Sandstone, light-colored, very dense, quartzitic, containing moderately fine

grains of calcite . 

Bottom. Shale, dark brownish-red, somewhat finely sandy, noncalcareous, micaceous;

contains a few molds of bivalves and a few ostracodes.

T_ojj. Dolomitic limestone(?) or hard silty shale(?) with reddish mottling and a few thin 

streaks and small inclusions of red shale. Material has the texture of limestone but 

does not react with cold acid.

Middle. Shale, gray, unctuous.

. Shale, dark reddish-brown, slightly gray-green mottled, unctuous, noncalcareous.

.. Shale, greenish-gray with brownish-red mottling, hard, noncalcareous. 

Middle . Shale, black with occasional brownish- red mottling, unctuous; traces of carbonaceous

material; slickensided surfaces. 

Bottom. Shale and sandstone. Brownish-red shale with gray mottling. Gray dense finegrained noncalcareous finely micaceous sandstone.

13
Lithologic description of cores Continued

Core 

no.

Depth 

(feet) Description

84

85

87

89

90

91

92

93

94

95

16,866-16,890

16,890-16,917

16,917-16,944

16,944-16,971

16,971-16,998

16,998-17,025 

17,025-17,052

17,.052-17, 067 

17,067-17,094

17,094-17,121 

17,121-17,148 

17,148-17,175

Top. Sandstone and siltstone. Gray dense highly micaceous slightly calcareous sandstone;

a trace of chlorite(?) and comminuted carbonaceous material. Light-gray hard dense

micaceous slightly calcareous siltstone. 

Middle . Sandstone, gray, dense, medium-grained, argillaceous, calcareous, with white

finely granular anhydrite(?) cement; a trace of chlorite(?); small fragments of lignite

and pyritized lignite. 

Bottom. Limestone and shale. Dark-gray shaly hard silty limestone. Dark-gray hard

waxy textured shale; contains one impression of a fossil fragment, several small fragments of lignite, and lenses of greenish-gray red-mottled hard unctuous shale.

Top. Limestone(?) or calcareous siltstone(?), dark-gray, hard, with shreds of carbonaceous material.

Middle. Shale, dark brownish-red with small blue-green mottlings, hard, waxy. 

Bottom. Shale, greenish-gray with brownish- red mottling, hard, silty, slightly micaceous,

possibly dolomitic. Material has the texture of limestone but does not react with cold

acid.

Top. Shale, dark-gray.

Middle. Shale, gray, hard, micaceous, with irregular streaks of brownish- red shale.

Bottom. Shale, dark-gray, hard, highly micaceous.

Top and middle. Shale, dark-gray, nard, slightly micaceous, none ale are ous. 

Bottom. Sandstone, light-gray, dense, fine-grained, micaceous; contains carbonaceous 

fragments and thin lenses of black carbonaceous finely and highly micaceous shale.

Top. Shale, gray, silty, hard, slightly micaceous, with texture of limestone but does not 

react with cold acid. Black shale, containing many lenses and veins of lignite or lignitic 

material cut by reticulate calcite veinlets. Lignite shows well-defined wood structure.

Middle. Sandstone, light-gray, moderately hard, argillaceous, calcareous, with many 

streaks and blebs of black carbonaceous shale and a minor amount of pyritized lignite.

Bottom . Shale, dark-gray, hard, silty, with texture of limestone but does not react with 

cold acid; a small amount of dark brownish- red shale.

TOP, middle, and bottom. Shale, dark reddish-brown, slightly micaceous, slightly 

streaked with gray-green shale.

T.QD. Shale, dark brownish- red.

Middle. Shale , dark reddish-brown, highly micaceous.

Bottom. Shale, like above, with blue-green streaks and splotches; occasional 

slickensided surfaces.

'--Shale, dark brownish- red, highly micaceous. 

Middle. Sandstone, very hard, dense, highly calcareous; contains fine-grained reddishbrown mica, green chlorite(?) grains, and peach-colored feldspar grains. 

Bottom . Shale, dark brownish- red with gray-green mottling, unctuous, slickensided.

TOD and middle. Shale, dark brownish- red, micaceous.

Bottom. Shale, sandstone., and lignite in interbedded thin lenses. Dark-gray hard shale. 

Conglomeratic sandstone, with many irregularly shaped angular to rounded fragments 

of hard dark-gray shale and carbonaceous material in matrix of light-gray dense finegrained calcareous sand.

T.QD. Shale, dark brownish- red with blue-green streaks and spots, unctuous. 

Middle. Shale, dark brownish-gray, silty, highly micaceous. 

Bottom. Shale, dull-red, hard, dense, granular- textured.

TOP. Shale, dark brownish- red with dark greenish-gray mottling, micaceous, 

Middle. Shale, dark brownish- red, micaceous, hard. 

Bottom. Shale, like above, irregularly sandy.

Top and middle. Shale, dark brownish- red.

Bottom. Sandstone, light-gray, dense, medium- to coarse-grained, calcareous, micaceous; 

composed of clear quartz grains, a few pink feldspar grains, and green chlorite(?) flakes.

14
Lithologic description of cores Continued

Core 

no.

Depth 

(feet)

Description

17,175-17,202

17,202-17,229

17,229-17,256

17,256-17,283

17,283-17,310

17,310-17,337

17,337-17,364

17,364-17,39-1 

17,391-17,417

17,417-17,444 

17,444-17,471

TOP. Shale f dark brownish-red, hard.

Middle. Sandstone and shale. Greenish-gray dense very fine grained calcareous sandstone, with irregular thin lenses of greenish-gray shale. Dark brownish-red finely 

micaceous shale, streaked with red sandstone.

Bottom. Shale, dark brownish-red, finely and highly micaceous.

TOP and middle. No samples.

Bottom. Sandstone, dull grayish-red, dense, medium-grained, calcareous, micaceous.

TOP. Sandstone and shale. Light pinkish-gray micaceous moderately coarse grained 

sandstone, composed mainly of clear quartz with many reddish or peach-colored feldspar grains, many blue-green chlorite(?) flakes, and a few black shale inclusions. 

Dark brownish-red finely micaceous shale.

Middle. Sandstone and shale. Light greenish-gray dense medium-grained to moderately 

coarse grained calcareous, micaceous sandstone, with occasional chlorite(?) flakes. 

Dark brownish-red finely and highly micaceous shale.

Bottom. Shale , like above but moderately.micaceous.

TOP. Shale, dark brownish-red, with a few thin blue-green veinlike streaks. 

Middle.-Sandstone, gray, dense, moderately coarse grained, highly micaceous, with

scattered grains of red feldspar. 

Bottom. Shale and sandstone. Dark brownish-red slightly and finely micaceous shale.

Greenish-gray hard slightly calcareous finely micaceous sandstone.

TOP. Sandstone, dark brownish-red, dense, fine-to medium-grained, calcareous.

Middle. Shale f dark brownish-red, irregularly sandy, calcareous, with nodular inclusions 

of red limestone.

Bottom. Shale, dark brownish-red, calcareous; contains a few scattered streaks of calcareous fine-grained blue-gray sandstone.

TOP. Shale f dark brownish-red, highly and irregularly sandy; sand is medium grained,

highly micaceous, and calcareous. 

Middle. Sandstone, light-gray, moderately coarse, with lenses of dark-gray very highly

micaceous shale. 

Bottom. Sandstone, light-gray, medium-grained to moderately coarse grained, calcareous,

micaceous.

Tap. Sandstone and shale. Conglomeratic sandstone, with irregularly distributed gray 

and brownish-gray pebbles and limestone nodules.

Middle. Mainly shale , dark reddish-brown, hard, calcareous, containing large fragments 

of lignitic plant material cut by thin calcite veins. Parts of core are a conglomerate 

composed of small fragments of lignite and nodules of dark-gray limestone.

Bottom. Sandstone, light-gray, dense, medium-grained, calcareous, micaceous.

TOP. No samples.

Middle. Shale, greenish-gray, very hard, dense, silty, slightly calcareous and micaceous.

BjjJiojn. Shale, dark brownish-red, finely micaceous.

TOP. Sandstone, dark brownish-red, hard, dense, moderately coarse grained, calcareous. 

Middle. Sandstone, light greenish-gray, medium- to coarse-grained, calcareous, micaceous,

with many blue-green chlorite(?) grains and many peach-colored feldspar grains. 

Bottom. Shale, dark reddish-brown, hard, calcareous, micaceous.

TOP. Shale, dark reddish-brown, hard, finely and highly micaceous. 

Middle. No samples.

Bottom. Sandstone, light greenish-gray, hard, dense, calcareous, with many small blue - 

green chlorite(?) grains and a few peach-colored feldspar grains.

Top. Sandstone, gray, conglomeratic, moderately coarse grained, calcareous, micaceous, 

with many irregular stringers and inclusions of shaly limestone and irregular lenses of 

black micaceous shale.

Middle. Sandstone, light-gray, hard, fine-grained, argillaceous, calcareous, somewhat 

micaceous.

Bottom. Shale and sandstone. Dark brownish-red and gray hard silty calcareous finely 

micaceous shale. Light-gray hard medium-grained to moderately coarse grained calcareous micaceous sandstone, containing irregularly shaped inclusions of gray limestone.

15
Lithologic description of cores Continued

Core 

no.

Depth 

(feet) Description

17,471-17,498

17,498-17,525

17, 525-17, 552 

17,552-17,579

17,579-17,606

17,606-17,631

17,631-17,658 

17,658-17,685

17,685-17,712

17,712-17,739 

17,739-17,766 

17,766-17,793

17,793-17,820

Top. Sandstone, greenish-gray, very dense, very fine-grained, quartzitic, highly calcareous.

Middle. Sandstone. dark reddish-brown, dense, fine-grained, quartzitic, highly calcareous. Other fragments of sandstone are light gray, coarse grained, and "calcareous, 

with lenses of lignite and pyritized lignite cut by reticulate calcite veinlets.

Bottom. Shale, dark brownish-red, hard.

Top. Sandstone, dark reddish-brown, dense, fine-grained, highly calcareous, slightly

micaceous. 

Middle and bottom. No samples.

TOD and middle. No samples.

Bottom. Shale, dark brownish-red, hard.

TOP. No samples.

Middle. Shale, dark brownish-red with a few small greenish-blue areas, hard.

Bottom. Shale, dark reddish-brown, calcareous, highly micaceous.

TOP. Sandstone, light-gray, moderately coarse grained, calcareous, somewhat micaceous,

with small inclusions of dark-gray micaceous shale. 

Middle. Sandstone, conglomeratic, calcareous, with many irregularly shaped fragments

of gray shaly limestone and dark-gray micaceous calcareous shale. 

Bottom. Sandstone, light-gray, dense, medium-grained to moderately coarse grained,

calcareous, micaceotus.

Top. Limestone and sandstone. Brownish-gray limestone, with irregular veinlike streaks 

of sandstone. Dense moderately coarse grained calcareous sandstone, with irregular 

streaks of dark-gray micaceous calcareous sandy shale.

Middle. Shale, dark reddish-brown, somewhat calcareous, highly and moderately finely 

micaceous, with mica partings and streaks of dark-gray highly micaceous highly carbonaceous or lignitic shale.

Bottom. Sandstone, light-gray, dense, moderately coarse grained, calcareous, containing 

a lens of fine-grained micaceous calcareous greenish-gray sandstone.

No samples.

Top. Shale, dark brownish-red, sandy, calcareous, highly micaceous.

Middle. Sandstone, light-gray, hard, moderately coarse grained, calcareous, somewhat

micaceous, with thin highly micaceous partings; contains a few grains of chlorite(?)

and a few grains of peach-colored feldspar. 

Bottom. Shale, dark brownish-red, hard, highly micaceous, slightly sandy.

TOP and middle. Sandstone, dull dark brownish-red, hard, moderately coarse grained,

shaly, calcareous, highly micaceous. 

Bottom. Sandstone, light greenish-gray, dense; moderately coarse grained, highly

calcareous, micaceous, with many peach-colored feldspar grains and some grains of

chlorlte(?).

TOD and middle. Sandstone, like bottom of core 115, with a few rounded or irregularly

shaped inclusions of gray micaceous shale and brownish-red shale. 

Bottom. Shale, dark reddish-brown, none ale areous, very finely micaceous.

TOP and middle. Shale, dark brownish-gray, micaceous.

Bottom. Sandstone, dark reddish-brown, hard, medium-grained, shaly, calcareous, highly 

micaceous.

Top. Sandstone, coarse-grained, with a few peach-colored grains and green chlorite(?) 

grains; conglomeratic appearance due to abundant irregular streaks and patches of 

dark brownish-red shale.

Middle. Shale, dark brownish-red, hard, granular-textured, calcareous, highly micaceous.

Bottom. Shale and sandstone. Very highly micaceous shale, similar to above. Light-gray 

hard,dense moderately coarse grained calcareous micaceous sandstone.

 Sandstone, gray-green, dense, medium-grained, calcareous, micaceous. Another 

par!; of core is composed of light-gray dense moderately coarse grained calcareous sandstone. 

. Shale, dark-gray, hard, granular-textured, silty, calcareous, micaceous. 

. Sandstone, greenish-gray, fine-grained, argillaceous, calcareous, micaceous.

16
Lithologic description of cores Continued

Core 

no.

Depth 

(feet) Description

120

121

122

123

124

125

126

127

128

129

17,820-17,847

17,847-17,874

17,874-17,901

17,901-17,928

17,928-17,955

17,955-17,982

17,982-18,009

18,009-18,034 

18,034-18,061

18,061-18,088

TOP. Sandstone, light-gray, hard, dense, moderately coarse grained, calcareous, somewhat micaceous. 

Middle. Sandstone, like above, with irregular inclusions of black finely micaceous shale

giving a conglomeratic appearance to parts of the core. 

Bottom . No samples.

TOP. Sandstone and shale. Light greenish-gray hard, dense, fine- to medium-grained 

calcareous micaceous sandstone, with a few peach-colored grains and blue-green 

chlorite(?) grains. Dark brownish-red calcareous slightly and finely micaceous shale, 

with hard limestone areas.

Middle. Sandstone, light greenish-gray medium -grained, slightly calcareous, micaceous. 

Another part of core is composed of light-gray dense coarse-grained calcareous sandstone.

Bottom. Sandstone, light-gray, hard, medium -grained, argillaceous, slightly calcareous. 

Another part of core includes light greenish-gray coarse-grained sandstone, with peachcolored quartz grains, green chlorite(?) grains, and a few irregular dark-gray shale 

inclusions.

TOP. Sandstone, like bottom of core 121, but without shale inclusions. 

Middle. Sandstone, dark brownish- red, hard, calcareous, finely micaceous. 

Bottom. Shale, dark brownish-red, hard, finely micaceous.

Top. Shale, dark brownish-red with a few small greenish-gray areas, calcareous, highly

and finely micaceous.

Middle. Shale, dark brownish- red, slightly silty, calcareous, highly micaceous. 

Bottom . Shale and sandstone. Dull dark brownish- red micaceous shale, with irregular

areas of red limestone. Dull brownish- red dense moderately coarse grained argillaceous

highly calcareous sandstone, containing a few green chlorite(?) grains and a few feldspar

grains.

TOP. Sandstone, like bottom of core 123.

Middle . Sandstone and shale. Greenish-gray hard, very dense medium- to coarse-grained

micaceous sandstone, with thin very highly micaceous lenses. Dark brownish- red hard

thinly laminated slightly calcareous finely micaceous shale. 

Bottom. Sandstone, light greenish-gray, moderately hard, moderately calcareous, micaceous. Another part of core is composed of dark greenish-gray very dense fine- to

medium -grained calcareous micaceous sandstone. '

TOP. Sandstone, hard, dense, lignitic, calcareous, micaceous,- with many thin highly

micaceous lenses.

Middle. Shale, dark brownish- red, hard, granular-textured, finely micaceous. 

Bottom. Sandstone, greenish-gray, hard, dense, moderately coarse grained, calcareous,

micaceous.

TOP. Sandstone, pinkish-gray, dense, moderately coarse grained, calcareous, micaceous;

contains many pink-tinted grains and some chlorite(?) grains. Many thin, irregularlyshaped red shale inclusions give the sandstone a conglomeratic appearance. 

Middle. Sandstone, like above, with shale inclusions and thin highly micaceous green

unctuous shale lenses. 

Bottom. Sandstone, like above, with red shale inclusions; contains a thick lens of

dark brownish- red finely and highly micaceous shale.

. Shale, dull dark-red, like bottom of core 126. 

Middle and frottom. Shale, like above, with a lens of dull-red medium -grained micaceous 

calcareous sandstone.

Tjjp. Sandstone, dull brownish- red, medium -grained, highly calcareous, micaceous. 

Middle. Similar to above but moderately coarse grained; contains a little chlorite(?) and 

lenses of red calcareous shale with small inclusions of sandstone. 

. Sandstone and shale, red, thinly and irregularly interbedded.

Top. Shale, dark brownish-red, silty,1 calcareous, very highly micaceous.

Middle. Shale, with thin shaly sandstone lenses . Dark brownish-red smooth- textured hard

very finely micaceous shale. Dark brownish-red medium-grained shaly micaceous sandstone. 

Bottom. Sandstone, very dense, moderately coarse grained, highly calcareous, slightly

micaceous; contains small irregular inclusions and a lens of hard dark-red shale. At ^

18, 086 ft, light-green shaly noricalcareous micaceous siltstone. At 18, 088 ft, red highly silty

finely micaceous shale.

17
Lithologic description of cores Continued

Core 

no.

Depth 

(feet) Description

130

131

132

133

18, 088-18,115

18,115-18,142

18,142-18,169

18,169-18,196

TOP. Shale, dark brownish-red, hard, slightly and finely micaceous.

Middle. Shale and sandstone in thin highly micaceous lenses, mixed in irregular streaks 

and blebs as if roughly stirred together. Dark brownish-red shale. Dense mediumgrained calcareous micaceous sandstone.

Bottom. Sandstone, grayish-red, fine-grained, micaceous.

Top. Shale and sandstone. Dark grayish-red hard slightly sandy micaceous shale, containing hard red limestone areas. Pale brown moderately dense medium-grained micaceous sandstone; mica predominantly biotite with a few dark-green flakes.

Middle. Sandstone and a little sandy shale. Dark grayish-red dense medium-grained 

calcareous micaceous sandstone. Dark grayish-red hard micaceous shale.

Bottom. Sandstone, mottled light reddish-gray and light greenish-gray, dense, slightly 

calcareous, micaceous. Mica is apparently biotite and muscovite, with occasional 

copper-colored and dark-green flakes.

18r 142-18f 146 ft. Sandstone, dark brownish-red, dense, medium-grained, slightly calcareous, micaceous; composed chiefly of quartz grains with a few grains of red feldspar 

and a few grains of green chlorite(?). Thin lenses in the sandstone contain abundant 

small even-sized hard dull-black nodules of magnetite(?). Sandstone contains thin 

irregular patches of red shale and thin highly micaceous lenses in which mica is 

colorless or copper-colored with occasional black flakes.

18.146-18,149 ft. Sandstone, like above, with many small thin irregularly shaped red 

shale inclusions. Black magnetite(?) nodules absent.

18f 149-18.152 ft. Sandstone, like above, dense, fine-grained, micaceous, with thin very 

highly micaceous partings.

18.152-18,153 ft. Shale and sandstone. Dark brownish-red finely micaceous shale, with 

thin lenses of shaly micaceous red sandstone. Greenish-gray dense fine-grained calcareous micaceous sandstone, with many small nodular inclusions of gray shale and a 

few small inclusions of bluish-green chlorite(?)

18jl53-18T 161 ft. Sandstone, dull-red, dense, medium-grained, slightly calcareous micaceous, with thin highly micaceous partings and .many moderately small irregular red 

shale inclusions.

18f 161-18r 164 ft. Sandstone, red, dense, fine-grained,- slightly calcareous.

18.164-18.165ft. Shale and sandstone. Dull dark brownish-red silty finely and highly 

micaceous shale. Greenish-gray dense medium-grained micaceous lignitic sandstone, 

with many irregular thin smears of gray shale containing green chlorite(? j flakes.

18.165-18.168 ft. Sandstone, dull dark-red, hard, fine-grained, shaly, micaceous.

18.168-18.169 ft. -Sandstone and red shale, interbedded. Red very fine-grained micaceous sandstone.

18.169-18.180 ft. -Like bottom foot of core 132.

18.180-18.181 ft. Sandstone with thin micaceous shale partings. Light greenish-gray dense 

fine-grained micaceous sandstone, with thin lenses composed of abundant small lignite 

fragments. Gray highly micaceous somewhat carbonaceous shale, with thin lenses of 

dull-red micaceous dense medium-grained sandstone.

18.181-18.183 ft. Sandstone, dull brownish-red, dense, medium- to fine-grained, micaceous; a few very thin very highly micaceous red shale partings.

18.183-18.185 ft. Shale and sandstone.' Gray hard finely and highly micaceous shale, 

with partings composed almost entirely of mica. Greenish-gray hard dense mediumgrained micaceous sparsely lignitic densely and irregularly spotted sandstone,smeared 

with blebs of red shale and gray shale; contains areas coated with small rounded lumps 

of light-green chlorite(7).

18.185-18.186 ft. Sandstone, dull-red, dense, medium-grained, calcareous, micaceous; 

contains a little feldspar and small light bluish-green chlorite(?) grains. Sandstone is 

thickly and irregularly smeared with red shale.

18.186-18.187 ft. Sandstone, light-green, hard, dense, fine- to medium-grained, slightly 

calcareous, micaceous; contains many peach-colored grains of feldspar(?) and partings 

of black and colorless mica.

18.187-18.192 ft. Sandstone, light-pink, but otherwise similar to above; contains red highly 

micaceous shale partings in which most of the mica flakes are copper colored.

18.192-18.196 ft. Shale, chiefly dark-gray, with lenses of copper-colored mica; a minor 

amount of red micaceous shale; scattered lenses of gray to greenish-gray shaly sandstone 

containing carbonaceous fragments.

18
Lithologic description of cores Continued

Core 

no.

Depth 

(feet) Description

134

135

136

137

138

18,196-18,223

18,223-18,250

18,250-18,277

18,277-18,304

18,304-18,331

18.196-18.198 ft. -Sandstone, dull dark-red, shaly, micaceous.

18.198-18T 202 ft. Shale, dull dark-red, with carbonaceous(?) fragments showing peculiar 

leaflike structure.

18 r 202-18. 205 ft. Sandstone, dull-red, fine-grained, shaly, highly micaceous.

18.205-18.214 ft. Sandstone, dull-red, dense, medium-grained, slightly calcareous, micaceous, with lenses of red micaceous shale and sandy shale.

18. 214-18.215 ft. Shale, dull dark-red, with irregular highly sandy lenses and thin highly 

micaceous partings.

18 r 215-18.223 ft. Sandstone, red, hard, dense, fine-grained, shaly, micaceous.

18r 223-18. 228 ft. -Like bottom of core 134.

18r 228-18,231 ft. Sandstone, light greenish-gray, micaceous, calcareous; conglomeratic 

appearance due to irregularly shaped inclusions of red and dark-gray shale. Sandstone 

contains many copper-colored mica flakes, light-green chlorite(?) grains, and peachcolored grains of feldspar(?).

18.231-18r 232 ft. Sandstone, like above, with a slight pinkish tinge; contains a large 

embedded pebble of novaculite(?) and large crystals which originally were probably 

pyrite, now altered to hematite.

18.232-18,235 ft. Sandstone, light-red, medium-grained, slightly calcareous, with highly

micaceous partings; contains scattered lenses of the small black magnetite(?) nodules

which occurred first in the top 4 ft of core 132. 

18, 335-18,. 236 ft. Sandstone, light-green, medium-grained, micaceous, irregularly

streaked and smeared with dull-red shale.

18, 236-18.238 ft. Sandstone, dull-red, medium-grained, with highly micaceous partings. 

18,238-18.239 ft. Sandstone, light greenish-gray, medium-grained, micaceous, with

many small blebs of red shale, and a few thin highly micaceous partings; contains a few

hard black magnetite(?) pellets. 

18. 239-18.250 ft. Sandstone, dark-red, medium-grained, shaly, micaceous.

18.250-18,256 ft. Sandstone, light greenish- to reddish-gray, dense, medium-grained, 

micaceous.

18. 256-18. 258 ft. Sandstone, like above, calcareous, with thin highly micaceous partings 

and thin lenses of very highly micaceous dark-gray shale.

18f 258-18r 266 ft. Shale, dull dark-red, finely micaceous, none ale are ous, with irregular 

thin lenses of medium-grained sandstone and occasional hard red sandy limestone areas.

18. 266-18.269 ftt Sandstone, dull-red or reddish-gray, dense, medium-grained, noncalcareous, micaceous; composed mainly of quartz with occasional feldspar, mica, and 

light-green chlorite(?) grains; contains scattered blebs of red shale.

18.269-18.277 ft. Sandstone, like above; in part, shaly with highly micaceous partings.

18r 277-18,296 ft. Sandstone, dull grayish-red, medium-grained to moderately coarse 

grained, containing a few scattered lignite fragments and red shale blebs.

18 f 296-18r 301 ft. Sandstone, red, dense, medium-grained, shaly, with numerous thin 

highly micaceous partings.

18.301-18.304 ft. Shale, dull dark-red., irregularly bedded, somewhat sandy, micaceous.

18.304-18.306 ft. Sandstone and shale, irregularly interbedded, containing scattered blebs 

of pink anhydrite. Dull dark brownish-red, medium-grained sandstone. Red shale, with 

irregular streaks and patches of shaly sandstone.

18.306-18.308 ft. Shale, dull dark-red, micaceous, silty to sandy, irregularly bedded.

18.308-18.313 ft. Sandstone, dull dark-red, very dense, fine-grained, calcareous, micaceous, with dark-red shale lenses.

18.313-18.316 ft. Sandstone, red, similar to above, with a few greenish-gray mediumgrained highly micaceous sandstone lenses.

18.316-18.319 ft. Sandstone, dull grayish-red, medium-grained to moderately coarse 

grained, calcareous, with a few thin highly micaceous partings and scattered pebblelike 

inclusions of red shale.

18.319-18.322 ft. Sandstone, dull dark-red, dense, fine- to medium-grained, slightly 

calcareous, with occasional light-green chlorite(?) grains and grains of feldspar.

18.322-18.325 ft. Sandstone, dull grayish-red, dense, moderately coarse grained, 

micaceous, calcareous; contains a few small fragments of lignite and small anhydritic 

areas. Conglomeratic appearance in parts of core due to many blebs and irregular 

streaks of dark-red shale and red to brown cryptocrystalline limestone.

18.325-18.331 ft. Shale, dull dark-red, hard, micaceous, finely sandy to silty, with 

moderately large blebs of pink anhydrite.

19
Lithologic description of cores Continued

Core 

no.

Depth 

(feet)

Description

139

140

141

142

143

144

145

18,331-18,358

18,358-18,385

18,385-18,412

18,412-18,439

18,439-18,466

18,466-18,501

18, 501-18, 509

18r 331-18, 338 ft. Shale, dark grayish-red, very finely and highly micaceous, with 

slickensided surfaces; contains lenses of grayish-red to greenish-gray hard,dense 

medium-grained sandstone with blebs of pink anhydrite about half an inch in diameter.

18. 33S-18.350 ft. Sandstone and shale. Dense fine-grained shaly micaceous noncalcareous 

.sandstone, grayish-red with gray-green mottling. Chiefly grayish-red slightly micaceous 

shale and a little sandy dark grayish-red shale.

18. 350-18. 354 ft. Shale, dull grayish-red, highly and finely micaceous.

18. 354-18. 358 ft. Shale, like above, with a few lenses of dense shaly micaceous dull 

grayish-red sandstone.

18. 358-18. 370 ft. Shale, dull dark grayish-red, finely and highly micaceous, noncalcareous.

18. 370-18. 376 ft. Shale, like above, with lenses of dull-red micaceous calcareous dense 

fine-grained shaly sandstone.

18. 376-18. 385 ft. Sandstone with scattered shale lenses. Dull grayish-red dense mediumgrained noncalcareous micaceous sandstone (biotite and a copper-colored variety); 

composed chiefly of quartz grains with light bluish-green and orange- or peach-colored 

grains of other minerals.

18.385-18. 391 ft. Sandstone, like above, with a few small blebs of red shale.

18. 391-18. 409 ft. Sandstone, like above, with mica partings and irregular blebs of gray

and greenish-gray shale. Shale contains scattered carbonaceous fragments which give

a conglomerate appearance to parts of the core. 

18. 409-18. 412 ft. Sandstone, light grayish-red and light greenish-gray, medium-grained,

micaceous (biotite), with blebs of red shale; composed chiefly of quartz with a few grains

of light-green chlorite(?) and orange-colored feldspar(?).

18. 412-18. 430 ft. Sandstone, like bottom of core 141.

18. 430-18. 439 ft. Shale, dark grayish-red, hard, finely micaceous, with platy fracture;

contains a lens of light greenish-gray dense calcareous micaceous sandstone with blebs

of gray shale and carbonaceous fragments.

Recovered 22 ft.

5 ft. Sandstone, grayish-red, dense, fine-grained, slightly calcareous, micaceous.

5 ft. Sandstone, like above, with partings of black biotite partly altered to copper-colored

mica. A lens in the sandstone appears conglomeratic due to blebs of red shale. 

4 ft. Sandstone, dark grayish-red, micaceous, shaly, with a few red shale blebs; contains

a -|-inch layer of hard dark grayish-red platy finely micaceous shale. 

8 ft. Shale, dark grayish-red, finely micaceous, calcareous; contains scattered layers of

dark-gray sandstone.

Recovered 32 ft.

6 ft. Sandstone, grayish-red, dense, fine- to medium-grained, highly calcareous, micaceous, with partings of black micaceous shale and a few small brownish-gray limestone 

inclusions.

6 ft. Sandstone with shale lenses. Greenish- to reddish-gray dense medium-grained 

calcareous micaceous sandstone. Dark grayish-red hard finely micaceous shale.

6 ft. Sandstone, light-gray to greenish-gray, dense, medium-grained, calcareous, micaceous; appears conglomeratic due to areas of gray nodular lime stone and blebs of black 

shale.

6 ft. Sandstone, light-gray, light grayish-red and greenish-gray, dense, medium-grained, 

micaceous, slightly calcareous, with a few blebs of red shale.

6 ft. Sandstone, light-gray, as above, with conglomeratic appearance due to many irregular 

red-brown limestone areas and blebs of red and gray shale.

2 ft. Sandstone and thin lenses of shale. Grayish-red and greenish-gray sandstone, containing shale blebs and thin lenses of mica. Dark grayish-red finely micaceous shale.

Recovered 6 ft.

3 ft. Sandstone composed of grayish-red and greenish-gray lenses. Dense medium-grained 

calcareous somewhat micaceous grayish-red lenses. Greenish-gray lenses contain biotite, 

many light-green chlorite(?) grains, or^ge feldspar(?) grains, and many small irregular 

blebs of red shale.

3 ft. Sandstone, light reddish-gray, medium-grained, micaceous, v'/ith blebs of red shale.

20
Lithologic description of cores Continued

Core 

no.

Depth 

(feet) Description

146

147

148

149

18, 509-18, 536

18, 536-18, 584

18,584-18,633

18,633-18,640

18. 509-18. 521 ft. Sandstone, light grayish-red, dense, fine- to medium-grained, micaceous, with flakes and partings of biotite and copper-colored mica; composed mainly of 

quartz with grains of light blue-green chlorite(?) and reddish-orange feldspar(?). 

18, 521-18. 527 ft. Sandstone, light greenish-gray, dense, fine- to medium-grained,

slightly calcareous, with small blebs of dark-gray carbonaceous shale and a few thin 

lenses of biotite. 

18. 527-18. 533 ft. Sandstone, light-gray and greenish-gray, dense, fine- to mediumgrained, with thin lenses of mica. 

18. 533-18. 536 ft. Sandstone, light greenish-gray, medium-grained, micaceous (biotite 

and muscovite), noncalcareous, with a few blebs of grayish-red shale.

18. 536-18f 542 ft. Sandstone, light greenish-gray, fine-grained, micaceous (muscovite);

composed chiefly of quartz with a few reddish-brown grains of feldspar(?); contains

carbonaceous fragments and thin layers of mica. 

18. 542-18. 548 ft. Sandstone, light greenish-gray, dense, fine- to medium-grained, slightly

calcareous, with thin lenses of muscovite and biotite and a few streaks of copper-colored

mica flakes. 

18, 548-18, 554 ft. Sandstone with scattered shale lenses. Light reddish-gray dense fineto medium-grained sandstone, calcareous and micaceous (biotite and altered biotite). 

Dark grayish-red micaceous shale lenses, with sitty limestone areas.

18. 554-18. 560 ft. Sandstone and shale. Light reddish-gray dense medium-grained micaceous calcareous sandstone, similar to that in the last few cores. Sandstone contains 

blebs of red shale and lenses of dull grayish-red finely and highly micaceous noncalcareous 

shale.

18. 560-18. 565 ft. Sandstone, light greenish-gray and light reddish-gray, medium-grained,

quartzitic, micaceous, with many thin lenses of muscovite, biotite, and copper-colored 

mica; black carbonaceous(?) fragments common in lower portion of core.

18. 565-18. 578 ft. Sandstone with shale lenses. Greenish-gray dense fine- to mediumgrained micaceous sandstone, with thin lenses of mica. Chiefly dark grayish-red highly 

and finely micaceous shale lenses, with a few lenses of hard dark-gray thinly laminated 

very finely micaceous shale.

18. 578-18. 584 ft. Sandstone and shale lenses. Light greenish-gray and grayish-red dense

medium-grained micaceous sandstone, with biotite, muscovite, and copper-colored flakes. 

Dark grayish-red micaceous shale lenses, with occasional lignite inclusions.

18f 684-18P 589 ft. Shale, dark grayish-red, hard, micaceous, noncalcareous, in part highly

and finely sandy. 

18r 589-18f 592 ft. Sandstone, grayish-red, dense, fine-to medium-grained, micaceous.

Parts of core show aggregates of minute evenly distributed particles of black magnetite(?). 

18. 59,2-18. 593 ft. Shale, dark grayish-red, highly micaceous, noncalcareous.

18. 693-18.613 ft. Sandstone, interbedded red, grayish-red, light-gray, greenish-gray and 

light-green, dense, medium-grained to very fine grained, calcareous to noncalcareous, 

micaceous; composed chiefly of quartz with scattered grains of red feldspar; contains 

a few blebs of red shale and occasional thin highly micaceous partings.

iap _613-18 P 614 ft. Siltstone, reddish-gray, hard, dense, micaceous, calcareous.

18.614-18,617 ft. Sandstone, light greenish-gray, dense, medium-grained to very fine

grained, micaceous, calcareous, with thin streaks of lignite. 

18r 617-18,619 ft. Shale, dark grayish-red, dense, with irregular micaceous finely sandy

areas. 

18 f 619-18.620 ft. Sandstone, dark grayish-red, medium-grained, micaceous, with mica

in irregular shaly streaks. 

18 f 620-18.621 ft. Shale, dark grayish-red, highly silty, highly and finely micaceous.

18.621-18.623 ft. Sandstone, grayish-red and greenish-gray, dense, fine-grained, noncalcareous, micaceous with abundant copper-colored flakes. 

18 r 623-18f 625ft. Shale, dark grayish-red, highly micaceous, with irregular veinlike

streaks of red shaly medium-grained micaceous sandstone. 

18 r 625-18 P 627 ft. Sandstone and shale, irregularly and thinly interbedded, dark grayishred, very fine grained, highly micaceous. 

18.627-18.633 ft. Sandstone, light grayish-red, dense, fine-grained, micaceous; composed chiefly of quartz with scattered grains of red feldspar, green chlorite(?), and 

magnetite(?).

Sandstone, light reddish-gray, dense, highly micaceous with abundant copper-colored 

flakes; contains scattered blebs of red shale.

21
Lithologic description of cores Continued

Core 

no.

Depth 

(feet) Description

150

151

152

153

18,640-18,659

18,659-18,685

18,685-18,710

18,710-18,737

Recovered 15 ft.

15 ft. Sandstone, light greenish-gray and light reddish-gray, dense, medium- to finegrained, slightly calcareous, micaceous, with many copper-colored flakes. Sandstone 

composed chiefly of quartz grains, with scattered grains of black magnetite(?), lightgreen chlorite(?), and red feldspar; contains occasional blebs of red to gray micaceous 

shale and shreds of carbonaceous material.

18.659-18.662 ft. Sandstone, light-gray, medium-grained, micaceous, with conglomeratic 

appearance due to abundant small blebs of dark-gray shale; a few inclusions of selenite(?).

18.662-18,664 ft. Siltstone, greenish-gray, dense, none ale are ous.

18.664-18.666 ft. Sandstone, light-gray to grayish-red, dense, medium- to fine-grained, 

micaceous with black and colorless flakes; contains fragments of black highly carbonaceous 

shale.

18.666-18.667 ft. Shale, dark grayish-red, highly micaceous, sandy.

18.667-18.671 ft. Sandstone, interbedded greenish-gray, pinkish-gray and grayish-red, 

dense, medium- to fine-grained, slightly calcareous, highly micaceous with many coppercolored flakes.

18,671-18.674 ft. Shale, dark grayish-red, laminated, slightly carbonaceous, micaceous; 

bottom foot finely and irregularly sandy.

18.674-18,677 ft. Sandstone, dark grayish-red, dense, very fine grained, micaceous, with 

irregular shale lenses.

18.677-18.685 ft. Shale, dark grayish-red, highly micaceous; in part, irregularly and 

finely sandy.

18r 685-18,687 ft. Shale, dark grayish red, finely and highly micaceous, irregularly sandy

to silty. 

18,687-18j694_ft. Sandstone, mainly light greenish-gray with a minor part grayish-red,

dense, medium- to fine-grained, slightly calcareous, micaceous with colorless, black

and copper-colored flakes. Bottom foot contains irregular streaks and blebs of red

sandy micaceous shale.

18.694-18,695 ft. Shale, black, withslickensided surface dipping at a very high angle suggesting a fault plane. The lithology of the samples changes markedly below the depth of 

18,695ft.

18.695-18,697 ft. Sandstone, light greenish-gray, fine-grained to moderately coarse

grained, slightly calcareous, micaceous (mainly biotite), with small carbonaceous areas

and irregularly rounded blebs of gray shale. 

18 f 697-18f 703 ft. Sandstone, gray, dense, medium- to fine-grained, calcareous,

micaceous, with a few scattered thin lenses of black to brownish-black micaceous

shale.

18.703-18.704 ft. Sandstone and shale. Sandstone like above. Black micaceous fossiliferous shale with numerous ostracodes and a few bivalves.

18.704-18.706 ft. Sandstone, gray, dense, calcareous, medium-to fine-grained, 

micaceous.

18.708-18.709 ft. Shale, brownish-black to reddish-brown, partly sandy, micaceous, 

noncalcareous; breaks with irregular fracture and shows small slickensided areas; 

contains many ostracodes and fragmentary fossils.

18.709-18.710 ft. Shalv sandstone or sandy shale, dark brownish-gray, slightly calcareous.

18.710-18r 716 ft. Sandstone, mainly bluish gray-green, very dense, fine-grained, 

calcareous, slightly to highly micaceous with black and colorless mica; at top of 

core, a few thin irregular lenses of black shale.

18.716-18.717 ft. Shale, dark-gray, silty, exceedingly highly micaceous, slightly 

carbonaceous. Core splits horizontally along highly micaceous parting planes.

17.717-18,732 ft. Sandstone, interbedded greenish-gray, bluish gray-green, lightgray and bluish-gr'ay, hard, dense, fine-grained, slightly calcareous, slightly to 

highly micaceous.

18.732-18,734 ft. -Shale, black, micaceous; bottom foot highly silty.

18.734-18r 735 ft. Siltstone, gray, shaly, very highly micaceous, slightly carbonaceous.

18.735-18.736 ft. -Shale, dark-gray, silty, highly micaceous. 

18 r 736-18,737 ft. Sandstone, gray, dense, fine-grained, micaceous, with highly 

micaceous partings.

22
Lithologic description of cores Continued

Core 

no.

Depth 

(feet) Description

154

155

156

157

18,737-18,764

18,764-18,791

18,791-18,811

18,811-18,838

18,737-18,745 ft. Sandstone, top 5 ft light gray-green, bottom 3 ft gray; hard, dense, 

very fine grained to silty, micaceous to highly micaceous. At 18,741-18,742 ft, conglomeratic appearance due to irregular blebs of highly micaceous shale.

18. 745-18, 746 ft. Siltstone, 'dark-gray, thinly laminated, shaly, very highly micaceous, 

finely carbonaceous.

18r 746-18, 747 ft. Sandstone, gray, dense, very fine grained, calcareous, highly micaceous.

18. 747-18.748 ft. -Shale, black, micaceous.

18. 748-18,749 ft. Sandstone, gray, dense, very fine grained, micaceous.

18.749-18.750 ft. Shale, black, silty, highly micaceous, with carbonaceous fragments; 

contains a few molds of fossil bivalves.

18.750-18,755 ft. Sandstone, bluish- or greenish-gray, dense, very fine grained, calcareous, somewhat micaceous, with shreds of carbonaceous material.

18,755-18,764 ft. Siltstone, mainly gray with occasional bluish gray-green layers, dense, 

hard, slightly calcareous, micaceous; contains carbonaceous areas and a few highly 

micaceous lenses of silty shale.

18,764-18f 770ft. Siltstone, gray, dense, calcareous, somewhat micaceous, with carbonaceous shreds.

18,770-18,771 ft. Siltstone, like above, with interbedded layers of black highly micaceous 

finely carbonaceous shale. Core splits along shale layers at an angle of 25° to 30° 

with the horizontal.

18,, 771-18,772 ft. Siltstone, light bluish- and greenish-gray, dense, hard, calcareous.

18.772-lQf 773 ft. Siltstone, like above. Core splits along a shale layer at an angle of 

50° to 60° with the horizontal. The steep dips in this core and in the second foot above 

and the second foot below are probably associated with nearby faults.

18.773-18.774 ft. Siltstone, gray, hard, dense, micaceous, calcareous; contains impressions and molds of fossil bivalves.

18.774-1Q,775 ft. Siltstone, gray, dense, micaceous, calcareous. Lenses of black 

highly micaceous shale dip at an angle of more than 30° with the horizontal.

18.775-18,776 ft. -Shale, black, silty, finely micaceous.

18.776-18,778 ft. Shaly siltstone, dark-gray to black, hard, highly micaceous.

18.778-18,779 ft. Shale, black, finely micaceous, with carbonaceous fragments and highly 

silty areas.

18.779-18,780 ft. Siltstone. dark brownish-gray, micaceous, calcareous, with thin irregular areas of black shale.

18.780-18.781 ft. -Shale, dark-gray, hard, highly micaceous and silty.

18.781-18,783 ft. Shale, dark-gray, silty, highly micaceous, calcareous, with shreds 

of carbonaceous material. 

18.783-18.784 ft. Siltstone. dark-gray, micaceous, calcareous,

18.784-18f 787 ft. Shale, dark-gray, micaceous; bottom foot contains small carbonaceous 

fragments, poor impressions of fossil bivalves, and traces of other fossils.

18.78/7-18,791 ft. -Shale, dark-gray to black, silty, highly micaceous, with lignite fragments, shreds of carbonaceous material and fossil impressions; bottom foot contains 

lenses of highly calcareous, dense, dolomitic(?) siltstone, streaked with partings of 

smooth black shale.

Recovered 12 feet..

4 ft. Siltstone, gray, dense, hard, micaceous, calcareous.

Jilt. Shale, dark-gray, silty, dense, micaceous, calcareous (or dolomitic?).

3 ft. Shale, black, hard, micaceous, slightly silty, with lignitic fragments in bottom part.

18,811-18f 8J.6 ft. Shale, dark gray, silty, highly calcareous, finely micaceous, with 

carbonaceous shreds; sparsely fossiliferous.

18,816-18f 821 ft. Limestone with shale lenses. Dark brownish-gray limestone, with 

small inclusions of anhydrite and irregular calcite veins. Dark brownish-gray silty 

shale, similar to top 5 ft of core.

18.821-18.826 ft. -Shale, black, thinly laminated, silty, slightly calcareous, micaceous, 

finely carbonaceous, with lenses of shaly siltstone; sparsely fossiliferous.

18.826-18,831 ft. Shale, dark brownish-gray, thinly laminated, slightly calcareous, micaceous, with lenses of dark brownish-gray hard limestone; sparsely fossiliferous.

18.831-jL8f 838 ft. Limestone, dark brownish-gray, hard, dense, with irregular blebs of 

anhydrite.
Lithologic description of cores Continued

Core 

no.

Depth 

(feet) Description

158

159

160

161

162

163

164

18,838-18,886

18-, 886-18,936

18,936-18,986

18,986-19,031

19,031-19,081

19,081-19,131

19,131-19,181

18.838-18.873 ft. Limestone, dark brownish-gray, hard, dense, with scattered blebs of 

anhydrite and calcite and thin discontinuous calcite veins; fragmental fossils, Exocrvra 

sp. and others. Between 18,853 and 18,868 ft, limestone contains scattered areas of 

small oolites.

18.873-18.878 ft. Anhydrite, irregularly veined with black shale(?).

18.878-18.886 ft. -Limestone, similar to top part of core.

l_8j 886-18.896 ft. Limestone, dark brownish-gray, hard, dense, with scattered dolomitic(?)

areas, fossil fragments, and traces of microfossils. 

18.896-18.901 ft. Anhydrite, with minor amounts of black shale and limestone. Black

shale lenses in middle and bottom parts of core. Hard dense limestone, with small

inclusions of brown calcite. 

18,901-18,916 ft. Limestone, dolomitic, dark brownish-gray, dense, with small calcite

inclusions. 

18. 916-18.936 ft. -Anhydrite.

18,936-18,951 ft. Anhydrite, with veinlike streaks of black shale; a minor amount of dark 

brownish-gray dolomitic limestone containing blebs of anhydrite.

18,951-18,986 f_t. Anhydrite and limestone in approximately equal proportions, irregularly 

interbedded. Dolomitic dark brownish-gray hard dense limestone, with many small inclusions of coarsely crystalline brown dolomite.

18,986-19.004 ft. Dolomite, dark brownish-gray irregularly mottled with lighter brown, 

hard, dense, extremely fine grained, with scattered blebs of anhydrite.

19. 004-19. 020 ft. -Anhydrite.

19,020-19.028 ft. Anhydrite and dolomite. Dark brownish-gray dense extremely fine 

grained dolomite; occurs as irregular streaks and veinlike inclusions in the anhydrite.

19. 028-19r 031 ft. Dolomite, dark brownish-gray, dense, extremely fine grained.

19, 031-19, 036 ft. Dolomite, like bottom of core 161, containing a few molds of macrofossils, anhydrite blebs, and irregular veins of calcite.

19. 036-19. 042 ft. -Anhydrite.

19 f 042-19. 049 ft. Dolomite, dark brownish-gray, dense, very finely granular.

19. 049-19, 059 ft. Limestone, dolomitic, dark brownish-gray, hard, dense, with conchoidal fracture; contains irregular inclusions of dark-brown crystalline dolomite(?) 

and traces of fragmental fossils(?)

19,059-19.069 ft. -Anhydrite.

19. 069-19 r 074 ft. Limestone, dolomitic, gray, dense.

19. 074-19. 078 ft. -Anhydrite.

19 r 078-19r 081 ft. Limestone, dolomitic, dark brownish-gray, dense, with scattered 

crystals and aggregates of dolomite(?). When moistened, scattered areas and lenses 

in the limestone show moderately coarse oolitic structure.

_jL9 f Q81-19 f 090 ft. Limestone, dolomitic, like bottom part of core 162. When moistened, 

scattered lenses in the limestone show abundant small rounded to irregularly shaped 

sections of microfossils and oolites.

19. 090-19. 099 ft. - Anhydrite.

19.099-19.104 ft. Limestone, dolomitic, similar to top 9 ft of core, showing abundant 

fragmental material and sections of microfossils(?).

19.104-19.119 ft. -Anhydrite.

19, i;L9-j-9 r 121 ft. Dolomite, in part shaly, dark brownish-gray, hard, with platy fracture.

19.121-19.122 ft. -Anhydrite.

19.122-19 r 131 ft. Limestone, dolomitic, dark brownish-gray with light-gray streaks.

19.131-19 P 134 ft. Dolomite, light brownish-gray, dense, very fine grained.

19.134-19.135 ft. -Dolomite, like above, with light-gray anhydrite.

19.135-19.160 ft. Limestone, dolomitic, dark brownish-gray, dense, with sharp conchoidal fracture; contains dark-brown coarsely crystalline areas and scattered blebs 

of anhydrite. Lenses in the limestone are composed of tightly packed well-cemented 

rounded and irregularly shaped fossil(?) fragments and oolites(7).

19.160-19.165 ft. Dolomite, brownish-gray, dense, very finely granular.

19.165-19.167 ft. -Anhydrite.

19.167-19.169 ft. Dolomite, gray, dense, very finely granular, with salty taste.

19.169-19.180 ft. Anhydrite, irregularly streaked with dolomite. Gray to dark brownishgray dense very finely granular dolomite.

19.180-19.181 ft. -Dolomite, like above.

24
Lithologic description of cores Continue

Core 

no.

Depth 

(feet) Description

165

166

167

168

169

19,181-19,226

19,226-19,276

19,276-19,326

19,326-19,365

19,365-19,415

19.181-19.182 ft. -Dolomite, like bottom of core 164.

19.182-19.185 ft. -Anhydrite.

19, lgS-19, 189 ft. Dolomite, brownish-gray, dense, very finely granular.

19 r 189-19,194 ft. Anhydrite, with irregular areas of dolomite.

19.194-19.199 ft. Dolomite, brownish-gray, very dense, very finely granular.

19.199-19.201 ft. -Anhydrite.

19. 201-19 T 209 ft. Limestone, dolomitic, dark brownish-gray, hard, with marked conchoidal fracture. 

19.209-19 r 226 ft. Limestone, dolomitic, like above; shows many sections of microfossils

and macrofossil fragments when moistened with dilute acid. Limestone contains irregular

inclusions of black,bituminous(?) tarlike residue and shows a film of light oil or, i.j-esh

fractures; oil evaporates rapidly.

19,226-19.247 ft. Limestone, dolomitic, dark brownish-gray, with conchoidal fracture; 

contains scattered lenses of tightly cemented macrofossil fragments and a few microfossils. Limestone contains scattered irregularly shaped inclusions of black bituminous(?) 

tarlike residue, and at irregular intervals through the core a film of light oil occurs on 

fresh fractures.

19 f 247-19,, 254 ft. Dolomite, brownish-gray, showing traces of oolitic structure when 

moistened with dilute acid.

19, 254-19,261 ft. Limestone, dolomitic, with sharp conchoidal fracture. Like the top 

part of the core, the dolomitic limestone contains black inclusions and shows an oil 

film on fracture surfaces.

19, 261-19, 268 ft. Dolomite, dark brownish-gray, very finely granular, showing traces 

of oolites and fossil fragments.

19 r 268-19f 276 ft. Limestone, dolomitic, containing many fossil fragments; conchoidal 

fractures coated with film of oil as in preceding parts of core.

19,276-19,281 ft. Dolomite, dark brownish-gray, dense, very fine grained, containing 

many scattered dark-brown crystals and crystalline aggregates of dolomite(?).

19. 281-19. 286 ft. -Dolomite and limestone. Dolomite, like above. Oolitic fragmental 

limestone, cut by many small calcite veins.

19, 286-19, 296 ft. Limestone, dolomitic, dark to light brownish-gray, containing irregular coarsely crystalline areas and an anhydrite lens.

19 T 296-19,306 ft. Dolomite, dark to light brownish-gray, hard, dense, very fin j grained; 

contains many fossil fragments and brown, crystalline inclusions.

19.306-19.316 ft. -Limestone, dolomitic, like above.

19.316-19,326 ft. Anhydrite and dolomite, irregularly interbedded. Dark brownish-gray 

hard dense very finely granular dolomite, with anhydrite inclusions and coarsely crystalline areas.

19,326-19,331 ft. Limestone, dolomitic, containing many anhydrite inclusions and fossil fragments.

19,331-19,341 ft. Limestone, dolomitic, dark brownish-gray, dense, with conchoidal 

fracture. Many fractures show a thin film of oil like that described in preceding cores.

19.341-19.346 ft. -Anhydrite and dolomite, gray, dense.

19.346-19.356 ft. Limestone, dolomitic, dark brownish-gray, dense, with inclusions of 

coarsely crystalline dolomite; contains irregular lenses of light-gray dolomite with 

anhydrite inclusions.

19.356-19.365 ft. Dolomite, light-gray to light brownish-gray, dense, very fine grained, 

with scattered areas of coarsely .crystalline brown dolomite.

19.365-19.367 ft. Anhydrite, irregularly gray and black streaked.

19. 367-19.373 ft. Limestone, dark grayish-brown, hard, containing much anhydrite in 

irregular streaks and inclusions.

19.373-19.385 ft. Limestone, dark brownish-gray, dense; in part, dolomiticj in part, 

a dense oolite containing many fossil fragments.

19.385-19.388 ft. Siltstone or dolomite(?). gray, highly micaceous, calcareous.

19.388-19.390 ft. -Dolomite, dark brownish-gray, dense, very fine grained, slightly 

micaceous.

19.390-19.402 ft. Dolomite and limestone, dark brownish-gray, dense, with sharp conchoidal fracture, showing film of light oil on freshly broken surfaces. Top 7 ft of core is 

irregularly interbedded with dark brownish-gray to black shale.

19.402-19.414 ft. Dolomite, dark brownish-gray, dense, very fine grained.

19.414-19.415 ft. Limestone, dark brownish-gray, dense, coarsely oolitic; contains many 

irregular veinlets of brown crystalline calcite.

25
Lithologic description of cores Continued

Core 

no.

Depth 

(feet) Description

170

171

172

173

174

19,415-19,461

19,461-19,511

19,511-19,559

19,559-19,585

19,585-19,624

19 f 415-19,428 Jt. Limestone, dark brownish-gray, irregularly banded, somewhat oolitic;

contains many irregular scattered veinlets and inclusions of crystalline calcite and 

a few anhydrite inclusions. 

19. 428-19. 430ft. -Anhydrite.

19,430-19, 433 it. Limestone, dark brownish-gray, dense, oolitic, with a little anhydrite; 

contains calcite veinlets and small crystalline calcite aggregates. Fresh fractures show 

a film of oil; when core was moistened with water, small bubbles of brown oil issued 

slowly from very minute scattered pores.

19,433-19,439 ft. Dolomite, dense, very fine grained, with many areas of brown crystalline dolomite.

19 f 439-19, 452 ft. Anhydrite, with reticulate black streaks.

19, 452-19, 461 ft. Dolomite, dense, very fine grained with many areas of brown crystalline dolomite.

19, 461-19,462 ft. Dolomite, dark brownish-gray, very fine grained. 

19. 462-19, 464 ft. Anhydrite, irregularly streaked dark- and light-gray.

19, 464-19,465_£t. Dolomite, dark brownish-gray, dense, very fine grained.

19,465-19.467 ft. Anhydrite, irregularly streaked and spotted dark- and light-gray.

19,467-19,477 ft. Dolomite, dark brownish-gray, dense, with many elliptical, darkbrown crystalline areas; breaks with platy fracture and shows film of oil on fresh surfaces.

19, 477-19,479 ft. Anhydrite, with large dolomite inclusions.

19,479-19, 484 ii. Limestone, dolomitic, dark brownish-gray, dense, with conchoidal fracture; scattered irregular areas show sections of fragmental fossils and elliptical, crystalline inclusions; a film of light oil on fresh fractures.

19 r 484-19 r 489 ft. Dolomite, dark brownish-gray, hard, dense, with anhydrite lenses and 

inclusions in middle part of core.

19 r 489-19, 492 ft. -Anhydrite, irregularly dark and light-banded.

19,492-19,498 ft. -Dolomite, dark brownish-gray, hard, dense, with many irregularly 

shaped inclusions of brown crystalline calcite.

19.498-19,499 ft. Anhydrite, dark and light-banded.

19.499-19. 503 ft. -Limestone, dolomitic, dark brownish-gray, hard, dense, containing 

fossil fragments and inclusions of crystalline calcite.

19. 503-19. 505 ft. -Anhydrite.

jL9 f 505-19, 509 ft. Limestone, dolomitic, dark brownish-gray, dense, with inclusions of 

crystalline calcite.

19. 509-19. 510 ft. -Anhydrite.

19. 510-19. 511 ft. Limestone, dolomitic, hard, dense, with calcite(?) inclusions and veinlets of black pyritic material.

Recovered 35 ft.

gO ft. Dolomite and dolomitic limestone, dark brownish-gray, dense, finely granular, with 

flaky conchoidal fracture. Fresh breaks show a film of light oil and have a strong sulfur odor. Top part of core is pseudo-oolitic finely fragmental and cut by calcite veinlets;. 

shows a few minute pores.

15 ft. Anhydrite, with minor amount of brownish-gray dense saccharoidal dolomite.

Recovered 10 ft.

Top. Limestone, dolomitic, brownish-gray, dense, with many coarsely crystalline inclusions of dolomite(?).

piddle. Limestone, dolomitic, dark brownish-gray, dense, somewhat silty, friable; 

shows film of oil on fresh surfaces.

Bottom. Dolomite, dark brownish-gray, dense, highly oolitic, microfossiliferous.

Recovered 21 ft.

5ft. Oolite, dolomitic, with clearly defined oolites giving a rough appearance to fracture

surfaces; strong sulfur odor. 

ISJt. Shale, black, friable, with dolomitic oolite; fragmental fossils in parts of core;

film of oil on fresh breaks. 

1 ft. -Oolite, dolomitic, more dense and firmly consolidated than preceding parts of core;

contains impressions of ribbed fossil(?) fragments.

26
Lithologic description of cores Continued

Core 

no.

Depth 

(feet) Description

175

176

177

178

179

180

181

182

183

184

19,624-19,658

19,658-19,667

19,667-19,707

19,707-19,739

19,739-19,769

19,769-19,808

19,808-19,847

19,847-19,893 

19,893-19,942

19,942-19,990

Recovered 1|- ft.

if ft. Limestone, dolomitic, black, hard, somewhat oolitic, with a thin lens and many 

irregular veinlets and inclusions of calcite; strong sulfur odor.

Recovered 7 ft.

2 ft. Limestone, black, very dense, cut by calciie veinlets; wet surfaces show coarsely

oolitic texture; film of oil on fresh surfaces. 

5 ft. Limestone, dolomitic, dark brownish-gray, dense, oolitic, with conchoidal fracture

and fragmental fossils; film of oil on fresh surfaces. Bottom part of core is cut by

irregular calcite veinlets.

Recovered 38 ft.

3£_f_t. Limestone, dolomitic, dark brownish-gray, hard, dense, oolitic, with sulfur 

odor; contains sections of microfossils and fossil fragments, scattered inclusions of 

quartz and anhydrite. Five or six feet at the bottom of the core are slightly silty.

Limestone, dolomitic, dark-gray and dark-brownish-gray, hard, with scattered inclusions 

of anhydrite or gypsum. The lower one-half of the core contains chert inclusions and 

is cut by irregular thin veins of black calcite. At the depth of about 19, 712 to 

19,720 ft and in the bottom 2 ft of the core, streaks or lenses in the limestone show 

abundant large oolites when moistened with dilute acid. Freshly broken pieces of the 

core have a strong sulfur odor.

Limestone, dolomitic, dark-gray, hard, brittle, with sharp conchoidal fracture; contains 

scattered blebs of white anhydrite or gypsum and a few irregular veinlets of black calcite. Fresh fractures in the top 10 ft of the core frequently show a film of light oil; 

throughout the core, freshly broken pieces have a strong sulfur odor.

.Limestone, dolomitic, dark brownish-gray, dense, brittle, with sharp conchoidal fracture; 

contains scattered blebs of anhydrite or gypsum. The lowest 5 ft of the core contain 

anhydrite inclusions and veinlets of calcite and pyrite. Fresh fractures in the lower 

one-half of the core frequently show a film of light oil; throughout the core, freshly 

broken pieces have a strong sulfur odor.

Recovered 30 feet.

5 ft. Limestone, dolomitic, like bottom of core 180, with a few dark-gray shaly

lenses. 

5 ft. Limestone, dolomitic, dark-gray, with large veins and inclusions of anhydrite

or gypsum and a few inclusions of sulfur. Fairly large pores occur in the limestone

near the anhydrite and sulfur inclusions. 

10 ft. Limestone, dolomitic, dark brownish-gray, dense, brittle, with scattered blebs

of white anhydrite or gypsum; a film of light oil frequently occurs on freshly broken

surfaces. 

5 ft. Shale, black, hard, highly calcareous, with white anhydrite blebs, sparsely

fossiliferous. 

5 ft. Limestone, dolomitic, shaly dark brownish-gray, brittle, with white anhydrite

blebs. Throughout the core, freshly broken pieces have a strong sulfur odor.

Limestone, dark-gray, dense, with small inclusions of white anhydrite or gypsum, and 

scattered irregular streaks of dark brownish-gray brittle shale.

Limestone, shaly, dark-gray, brittle, with conchoidal fracture; contains scattered oolitic 

lenses and anhydrite blebs; a few molds of bivalves in upper part. Limestone has 

strong sulfur odor on fresh breaks and at depth of approximately 19,920 ft showed 

a film of light oil.

Limestone, shaly, dark-gray, brittle, dense; contains scattered fragments of ribbed 

bivalves and, in lower two-thirds of core, inclusions and veins of white anhydrite 

or gypsum.

27
Lithologic description of cores Continued

Core 

no.

Depth 

(feet) Description

185

186

187

188

189

19,990-20, 040

20,040-20,090

20, 090-20,140

20,140-20,177

20,177-20,227

19,990-19,995 ft. Limestone and shale, thinly interbedded or laminated. Dark-gray

limestone, with smooth platy fracture; contains blebs of white anhydrite. Black

pyritic shale. Core breaks along thin shale partings where the black shale coats

finely pitted rough-textured limestone. A film of oil occurs along fresh cleavages

and core has a strong sulfur odor. 

19 r 995-20. 005 ft. Limestone, shaly, dark-gray, brittle, with a few blebs of anhydrite

and veins of black calcite; contains molds and fragments of small ribbed bivalves. 

20.005-20. 010 ft. Limestone, dark-gray; in part, dense with large blebs of anhydrite;

in part, laminated with black shale and breaking along rough-textured pitted surfaces

as in top 5 ft of core. 

20f 010-20. 030 ft. Limestone, shaly, dark-gray to black, hard, brittle, with small,

scattered blebs of anhydrite; contains fragments of ribbed bivalves. 

20, 030-20. 035 ft. Limestone, dark-gray, interbedded with black, calcareous shale;

fracture is in part conchoidal, in part along thin overlapping plates. 

20. 035-20. 040 ft. Limestone, shaly, black, with small anhydrite blebs; shows oil

film on fresh breaks and has a strong sulfur odor.

20, 040-20, 045 ft. Limestone, very dark-gray, with large anhydrite inclusions. 

20, 045-20r 050 ft. Limestone and shale. Limestone, like above. Shale is dark

gray to black, possibly dolomitic, very finely granular, finely and highly micaceous,

and pyritic. 

20f 050-20T 055 ft. Limestone, dark-gray, with highly oolitic areas. In places, oolites

are in a matrix of anhydrite. 

20. 055-20, 065 ft. Limestone and shale. Dark-gray highly oolitic limestone. Black

finely granular calcareous shale. 

20. 065-2Qr 075 ft. Shale, black, thinly laminated, finely granular, highly calcareous;

contains a lens of hard dark brownish-gray limestone. 

2Qf 075-20, 030 ft. Shale, like above, with a little anhydrite and a lens of highly oolitic

limestone in which oolites are in part embedded in anhydrite. 

20f 030-20f 090ft. Limestone, black, in part dolomitic, stylolitic, with anhydrite

blebs. A thin section shows that limestone is minutely laminated (0.1 mm to

0.8 mm thick) with extremely thin silty bituminous(?) partings. Fragments of the

core break diagonally across the laminations, giving an extremely fine-stepped

or tiered appearance.

20,090-20,130 ft. Limestone with irregular shale lenses. Limestone, dark-gray to 

black, hard, with scattered anhydrite blebs and veins; minutely laminated like 

bottom of core 186. filack thinly laminated finely granular shale, ] possibly 

dolomitic, occasionally pyritic.

20.130-20.140 ft. Limestone, like preceding part of core; minutely laminated.

20.140-20.155 ft. Limestone, brownish-black, hard, with a few small blebs and

thin veins of anhydrite or gypsum; when moistened with dilute acid, shows faint

outlines suggesting oolitic structure. Fragments of core break vertically and

show regularly spaced laminae of black shale(?)'. 

20.155-20,160 ft. Limestone and shale. Dolomitic brownish-black limestone, with

irregular finely and highly oolitic lenses. Black finely granular dolomitic(?) shale. 

20.160-20.165 ft. Dolomite and shale. Brownish-black microgranular dolomite,

with a lens containing oolites and partly dolomitized fossil fragments. 

20.165-20.175 ft. Limestone and shale. Dolomitic dark brownish-gray limestone,

containing traces of fragments! fossils. Dolomitic{ ?) black granular thinly laminated

shale, with scattered oolitic areas.

20.176-20.177 ft. -Limestone, dolomitic, brownish-black, dense, with traces of 

fragments! fossils.

20.177-20.187 ft. -Dolomite, brownish-black, microgranular, with blebs and irregular 

areas of white anhydrite containing inclusions of sulfur.

20.187-20.192 ft. -Limestone, dolomitic, brownish-black, with blebs of white anhydrite 

or gypsum; contains irregular lenses of black finely granular shale.

20.192-20.197 ft. -Dolomite and dolomitic limestone, brownish-black, dense, microgranular, with anhydrite inclusions'.

20.197-20.217 ft. -Limestone and shale. Dolomitic brownish-black and dark brownish- ' 

gray dense brittle limestone, with conchoidal fracture; fresh fractures at top of core 

show a film of light oil and have a strong sulfur odor. Black granular thinly laminated 

highly calcareous shale, contains finely disseminated mica and pyrlte.

20.217-20.227 ft. -Dolomite, brownish-black, microgranular, with a few veins of anhydrite 

or gypsum.

28
Lithologic description of cores Continued

Core 

no.

Depth 

(feet) Description

190

191

192

193

194

195

196

197

Basket 

core.

20, 227-20,277

20, 277-20, 298

20,298-20,337

20,337-20,357 

20,357-20,404

20,404-20,415 

20, 415-20,437

20, 437-20, 441 

20,445-20,447

When core barrel was opened, core fell out on the derrick floor and sequence was lost. 

Representative samples of dolomite, dolomitic limestone, and shale are lithologically 

similar, in general, to the materials described in core 189. Several dolomite and 

dolomitic limestone fragments show a film of light oil on fresh fractures.

Recovered 12 ft.

4 ft. Shale, dolomitic(?), black, hard, granular.

4 ft. Dolomite, black, dense, microgranular, with thin lenses of black dolomitic shale.

4 ft. -r Dolomite, dark-gray, very finely granular, sparsely fossiliferous, with a few 

blebs of anhydrite; contains many irregularly scattered small pores-, apparently 

resulting from removal of microfossils, Qphthalmidiidae. SpirQpbftfllmid^jrp T 

and others. At depth of 20, 298 ft, gas smelling strongly of hydrogen sulfide 

made three or four heads blowing oil-base drilling mud about 15 to 20 feet into the 

- derrick.

Recovered 16 ft.

7 ft. Dolomite with a minor amount of shale. Dolomite is in part, black, dense,

microgranular and in part, dark-gray, finely granular, with small pores, as in

bottom of core 191. Dolomitic black hard shale. 

9 ft. Dolomite, dark-gray, finely granular, with dense microgranular areas of black

dolomite; a little anhydrite. The dark-gray dolomite contains small pores similar

to those in core 191.

Recovered 6 ft.

6 ft. Dolomite, black, dense, microgranular, shaly.

Recovered 21 ft.

16 ft. Dolomite , black, dense, brittle, microgranular, with veinlets and blebs of

anhydrite; shows film of oil on fresh fractures; 

JLft. Dolomite, like above, containing finely disseminated anhydrite.

Recovered 9 ft.

.5 ft. Dolomite, black, dense, microgranular, shaly, with thin lenses of black dolomitic(?) shale. 

4 ft. Dolomite, black, hard, dense, microgranular, with conchoidal fracture and

stylolitic structure.

Recovered 21 ft.

U&. Dolomite, black, dense, microgranular, with thin partings of black dolomitic

shale. Core breaks into thin plates.

f ft. Dolomite, black, hard, dense, microgranular, with sharp conchoidal fracture. 

U&. Clay, gray, very finely sandy, micaceous with colorless mica. 

15_££i. Anhydrite, gray, with crystalline structure. The anhydrite in this core is a

solid mass and differs in appearance from the fragmental, spotted, and veined anhydrite

in the cores from higher levels 

3j ft. Anhydrite, similar to above, but darker and harder; lacks crystalline structure

of the preceding 15 ft.

No recovery.

Approximate depths.

lit. Anhydrite, similar to above.

!_&. Rock salt, clear, white.

29

1HT.-OUP. SBC., WASH.. D.C:» 0 » 0 J
UNITED STATES DEPARTMENT OF THE INTERIOR 

GEOLOGICAL SURVEY

14.670

Core A B 

no.

15.000-

15.500-

15.650-1

-14.945

-14.722

Red limestone

A

V

A

Gray limestone. 

Lignitic

Red limestone

Lignitic

/

Anhydrite bleb

f

Red limestone

Gray limestone. Fossils

15,650

16,000-

16.500-

16.650-1

62

63

64

65

66

67 -_

68

69

70

71

72

73

74 I

Red limestone

F

li

Lignitic

Red limestone 

"Coal"

Lignitic

f

Gray limestone. Anhydrite

Anhydrite? cement.

Lignitic § 

Gray limestone, -o

Anhydrite bleb S g

fi

I;

16,650

17,000-

17.500-

Lignitic 

f

Anhydrite? cement 

Dark-gray limestone

First feldspar grains 

Lignitic

Gray limestone nodules 

Lignitic /

Lignitic

Gray limestone

17,650

A B

18.000

18.500-

18.650-1

/

/

p

R

c 

n

R 

f

 5

c 

o

£

Q)

(Haynesvil

o.

D

jj

> 

z

5

z

D

or

icr

or

UJ

Z

*:

m

11

i

1

11

11

1?

12

122 

123

124

125

126

127

128

129

130

131

33

34

37

39

~40

41

43

44

"45

47

50

-' 

 I

:"3fZ

r^rj

^Trizn

:i±T:

_ _

" 

:^-i--l

 

: :-^ :

17=1:

rErl

- 

. .TTT

-3-1

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 ^_1

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~T=~ 

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.TT .

._._._. .

^^-"^

'-^ -

-£;-£

- -T-.

i±^:±

 == 

::^

J1^'- 

.._...

 

_L.' LL1

-j-.j-^j.

...^

pxq

^7=r

. rr^.

-^

 :

~ ~

T~. . .

 '_! '

X

TlT!

l-rl

"T^:

-^

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 ^^

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 ^^

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 ^ .

^_>H

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.'"?-?-.'

18.650

-fTv-K Red limestone

Lignitic

-.^ / Recovered 15 ft

19,650-J 17,650-J

LOG FROM SAMPLES OF CORED SECTION IN GEORGE VASEN'S FEE WELL I , STONE COUNTY, MISSISSIPPI

20,000-

18 695 Fault plane. 

F Dip 45°-50°

18.770-18.771 ft 25°-30° dips 

18,772-18,773 ft 50°-60° dips 

18.774-18.775 ft 30° dips 

F Recovered 12 ft 

18.800 (approx.)

17,982 End of Core Laboratories, Inc., 

samples /

19,000

Magnetite? pellets 

Lignitic

Recovered 32 ft 

Limestone nodules

 Recovered 7 ft f 

Recovered 38 ft 

Quartz and anhydrite 

inclusions

Chert inclusions

Recovered 30 ft 

 Sulfur blebs 

f

Sulfur blebs

Recovered 12 ft 

Small pores

Recovered 16 ft 

Small pores

Recovered 6 ft 

 Recovered 21 ft

Recovered 9 ft

20,420

Recovered 21 ft

No Recovery 

20.450 Rocl< sal

Total depth

CIRCULAR 298 PLATE 1 

EXPLANATION

core)

No samples

Lime nodules 

(in shale and sandstone)

Anhydrite blebs 

(in limestone and dolomite)

Oil showing

Gas showing

Fossils identified (see text)

f

Fragmental fossils or 

microfossils not identified

Column A. From 14,670 to 17,982 ft Log from description of 

cores by Core Laboratories, Inc.

Column B. From 14,722 to 17,982 ft Log from E. R. Applin's 

description of the top. middle, and bottorr 

fractions of cores collected by Core Laboratories, Inc.