The Black Prince of southeastern Arizona

Item Type text; Thesis-Reproduction (electronic)

Authors Nations, Jack Dale

Publisher The University of Arizona.

Rights Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.

Download date 06/10/2021 01:00:12

Link to Item http://hdl.handle.net/10150/551504 TOE BUCK PRINCE LIMESTONE

OF

SOUTHEASTERN ARIZONA

by

Jack Dale Nations

A Thesis Submitted to the Faculty of the

DEPARTMENT, OF GEOLOGY

In Partial Fulfillment of the Requirements

For the Degree of

MASTER OF SCIENCE

In the Graduate College

THE UNIVERSITY OF ARIZONA

1961 STATEMENT BY AUTHOR

This thesis has been submitted in partial fulfillment of requirements for an advanced degree at The University of Arizona and is deposited in the University Library to be made available to borrowers under rules of the library.

Brief quotations from this thesis are allowable without special permission, provided that accurate acknowledgement of source is made. Requests of permission for extended quotation from or reproduction of this manuscript in whole or in part may be granted by the head of the major department or the Dean of the Graduate College when in their judgement the proposed use of the material is in the interests of scholarship. In all other instan­ ces, however, permission must be obtained from the author.

SIGNED i.

APPROVAL BY THESIS DIRECTOR

This thesis has been approved on the date shown belows

S/, /? £ / /D a te Professor of Geology Acknowledgements

This thesis has been planned and prepared under the direc­ tion of Dr. V. D. Pye and Dr. H. W. Hiller. I wish to express my appreciation for their cooperation and guidance. I-iy appreciation is also extended to other members of the faculty and to those graduate students who have offered helpful criticism and suggestions.

i CONTENTS

INTRODUCTION Location General Stratigraphy General Structure

ESCABROSA LIMESTONE

BUCK PRINCE LIMESTONE Introduction Distribution

Lithology 00 00 CO Ox Vx V) V) Thickness 12 Contact Relationships Escabrosa-Blaek Prince Contact 13 Black Prince-Horquilla Contact 16 Paleontology Introduction 17 Pre-Black Prince 19 Black Prince Fossils 19 Post-Black Prince Fossils 22 Age and Correlation zk

CONCLUSIONS 26 APPENDIX A Paleontological Descriptions 28

APPENDIX B Descriptions of Measured Sections hi

REFERENCES *5

FIGURES 1. Index map showing location of areas studied 2 2. Map showing location of Black Prince Limestone outcrops and access roads 7 3. Correlation diagram of generalized cross sections of the Black Prince Limestone lh h. Diagram showing age relationships of the Black Prince Limestone to the Horquilla and Escabrosa 27 PLATES I. Thin sections of &7 II. Thin sections of corals &9 III. Thin sections of corals and foraminifera 51 IV. Detailed columnar section of the Black Prince Limestone in the Johnny Lyon H ills in pocket V. Detailed columnar section of the Black Prince Limestone in the Gunnison Hills in pocket

i i INTOODUCTION

The age of the Black Prince Limestone has been open to question ever since it was first recognized and named by Gilluly, Cooper and

Williams in 1954. They first considered it an upper member of the

Escabrosa Limestone, but it was later mapped as a separate formation because fossils collected from it proved to be of upper Mississippian or lower age, and thus intermediate in age between the underlying Escabrosa Limestone and the overlying Horqullla Limestone.

The investigations by Gilluly et al (1954) led them to conclude that the Black Prince Limestone was a “lithologic facies that may be of an age equivalent to the part of the Escabrosa Limestone that is present locally and that is thought to be of late Osage or early Meraaec age.”

Williams stated that there was some evidence of lower Pennsylvanian age for the Black Prince limestone, but that this evidence was not strong. Armstrong (i 960) studied the specimens of Lfthostrotlonella collected by Cooper (Gilluly et al, 1954), from two feet above the base of the basal shale unit of the Black Prince limestone, and iden­ tified it as Llthogtrotionella ghiw«ri (Crlckmay) of Meramecian age.

In his opinion, the Blade Prince limestone is a localized member of the Meramecian part of the Hachita Formation, Escabrosa .

The objective of the present study has been to determine the geologic age of the formation by a detailed paleontological study.

1 2

Fig# 1 - Map Showing Location of Black Prince Limestone 3

The method used was an intensive field investigation and laboratory study of fossils collected from the Black Prince Limestone and beds immediately above and below it.

Location

The area of field investigation is approximately 30 m iles northeast of Benson, Arizona. Outcrops of the Black Prince Limestone were studied in the Gunnison H ills, in the L ittle Dragoon Mountains, and in the Johnny Lyon Hills. The exposure of the Black Prince Lime­ stone in the Whetstone Mountains was also examined, but was not studied in detail. The Johnny Lyon Hills section of the Black Prince Limestone is the most fossiliferous and least metamorphosed.

General Stratigraphy

Praeambriam A 500 foot series of clastic sedimentary rocks, known as the Apache Group, represents the Precambrian section in this area.

From oldest to youngest, the group consists of the Scanlan Conglomerate, , Pioneer Shale, Barnes Conglomerate, and the Dripping Springs Quartzite.

Cambrian system: About 700 feet of rocks rest uneonformably on the Apache Group. The formations present are the Troy-Bolsa Quart­ zite, Santa Catalina Formation, Cochise Formation, and the Atari go Forma­ tion. They range from middle to upper Cambrian in age, and consist essentially of interbedded quartzite, sandstone, shale, and limestone beds.

Ordivician and mvatems* Rocks of these two systems have not been reported from the area under investigation.

Devonian systemt The period is represented in this area by the Martin Limestone, which is predominantly limestone with some inter- bedded quartzite and shale.

Mlsslssinnian system: The Mississippian rocks in this area have been divided by Gilluly et al (195*0 into the Escabrosa Limestone and the

Black Prince Limestone. The Escabrosa limestone consists of limestone and dolomite. It varies in thickness from 600 to 750 feet in the area of the present investigation. The Black Prince Limestone consists of

15 to 27 feet of maroon shale and conglomerate at the base, overlain by ifco to l6o feet of limestone.

Pennsylvanian system* The Horquilla Limestone lies conformably on the

Black Prince Limestone, and reaches a thickness of approximately l600 feet in the area. It consists essentially of thin-bedded, medium- gray limestone, although some beds may reach thicknesses of 6 to 8 fe e t.

The upper half of the formation is characterized by occasional beds of reddish shale or shaly limestone interbedded with the limestone. Most of the limestone is dense and pinkish-gray on fresh fracture but some beds of coarse-grained crinoidal limestone are found in the formation.

A detailed description of the lower 60 feet of the formation, its lithology and paleontology, has been included in the sections on con­ tact relationships (p. 16) and paleontology (p. 23).

The Earp formation, which is of Pennsylvanian and age overlies the Horquilla Limestone and is about 1100 feet thick. 5 Permian system: Permian rocks above the Earp Formation in the area are,_ the Co Una Limestone, the Epitaph Dolomite, and the 8 ch error Formation.

The Epitaph Dolomite is not exposed near the areas of Black Prince out­ crop. It is believed to be present, but covered or faulted out.

General Structure

The area of study is located in the Basin and Range province of southeastern Arizona. The major structural trend in the area is about

30 degrees vest of north, as is indicated by the alignment of mountain ranges and major faults.

The Black Prince Limestone is exposed in three small ranges which are nearly aligned with each other and with the major structural trend of the area. The three ranges appear to be fault block structures, which have been tilted to the east. One exception may be the Little

Dragoon section, which is on the eastern flank of a faulted dome. The attitude of the Black Prince Limestone beds is nearly the same in the

Johnny Lyon H ills and the L ittle Dragoon Mountains.

In addition to the predominant northerly trending structural features, there are numerous small faults crossing the beds normal to

their strike. One such fault in the Gunnison Hills has an apparent

displacement of about 30 feet. Six minor transverse faults were ob­

served in the Johnny Lyon Hills within a distance of one mile. ESCABROSA LIMESTONE

The Escabrosa Limestone generally consists of white to light- gray, coarse, granular limestone or dolomite. Much of the limestone is made up entirely of fragments of stems. The lover part of the formation consists of massive beds 10 to 20 feet thick, which usually form cliffs and high ridges. These beds are essentially barren of chert. The middle and upper peert of the Escabrosa Limestone is cherty, with bedded chert in the middle and nodular chert toward the top. The upper part of the formation is thi*.bedded, and forms dip slopes. This thin-bedded upper portion has been said to be probably equivalent to the Black Prince Limestone in areas idlere the Black Prince is absent

(Gilluly et al, 195* and Armstrong, i 960). In general, the boundary between the Escabrosa Limestone and the overlying Horquilla Limestone is difficult to recognize in areas where the Black Prince Limestone is absent. According to Ransome

(190*), they can be distinguished lithologically by the more dense, thin-bedded, and pinkish character of the Horquilla Limestone. It con­ trasts with the thicker-bedded, granular, grayish Character of the

Escabrosa Limestone. The base of the Horquilla Limestone usually forms a topographic sag, but the actual position of the discohfomity cannot be identified more closely than within a score of feet, stratigraphical­ ly (Gilluly et al, 195*).

6 7

SECOND RIDGE FIRST RIDGE

Cross X / Ranch /

Deepwell Ranch

7 Bar/ Ranch

LITTLE JOHNSON DRAGOON MOUNTAINS

Miles DRAGOON

Contour Interval IOOO feet

BLACK PRINCE LS. OUTCROPS ROADS TRAILS

Fig. 2 - Outcrops of Black Prince limestone in Type Area BLACK PRINCE LIMESTONE

Introduction

The Black Prince Limestone is a shale and limestone unit lying between the Escabrosa Limestone and Horquilla Limestone. It is some

175 feet thick and is exposed in northwestern Cochise county and

eastern Pima county.

Distribution

Outcrops of the Black Prince Limestone have been observed by

the writer in the Johnny Lyon Hills (sec. 16, T. 1& S., R. 21 E.), in

the L ittle Dragoon Mountains (SB 1/& sec. 9 , T. 15 S«, R. 22 B .), in

the Gunnison Hills (NE 1/4 SW 1/4 sec. 4, T. 16 S., R. 33 2.), end in

the Whetstone Mountains (T. 19 S ., R. 19 E .).

Armstrong (i 960) reported the Black Prince Limestone in the

Tombstone Hills, and in the h ills south of Warren, Arizona.

Lithology

The Black Prince Limestone has a basal shale member with local

lenses of limestone, chert-pebble conglomerate, and scattered nodules

or pebbles of chert. The conglomerate is .especially well developed on

the western slope and just south of the main peak of the Gunnison Hills.

Here the conglomerate is locally a breccia and reaches a maximum thick­ ness of about 8 feet. It consists of red and white, angular pebbles of

8 9 chert which range from a fraction of an inch to 3 or 4 inches In di­

ameter. The matrix of the conglomerate is maroon to purple in color

and forms a hard, resistant rocke The bed is lenticular in shape, di­ minishing rapidly in thickness and in size of pebbles laterally.

The conglomerate grades into a fine-grained, purple sandstone

layer, from 1 to 5 feet thick. The sandstone is exposed at the base

of the shale on the slype directly west of the main peak of the Gunnison

Hills. A concentration of rounded heads of Lithostrotionella occurs

stratigraphically beneath the conglomerate, and appears to be a resi­

dual accumulation of sllicified remains left from erosion of

the underlying Bscabrosa limestone, in which they were originally de­

posited. Thin sections of the conglomerate show some well rounded and

some angular quartz grains. Some of the larger chert fragments ex­

hibit oolitic structure.

On the western slope and slightly north of the main peak of

the Gunnison Hills, the sedimentary breccia disappears. Here the lower

5 to 10 feet of shale includes nodules or boulders of white chert, some

exceeding one foot in diameter.

The basal shale is covered in the Little Dragoon section, ex­

cept at the top of the ridge. The thickness at this locality is about

15 fe e t, and the member i s apparently composed e n tire ly of maroon shale.

In the Johnny Lyon Hills, the lower 9 feet of the clastic mem- ■

her is made up of black to maroon limestone beds which have the appear­

ance of coarse sandstone. This resemblance to sandstone in hand 10 specimen is due to abundant fraspaents of angular chert which apparently . were deposited with the calcareous material. The average size of the chert fragments is 3 or 4 millimeters, but some range up to 50 m il­ limeters in diameter. An interfingering relationship of the limestone to shale can be observed on the north slope of the first ridge (see

Fig. 2) of the Johnny Lyon Hills.

Overlying the basal shale member is the main unit of the Black

Prince Limestone. As a whole, the limestone is light-gray to white in

color. When viewed from a distance, it forms a light colored band be­

tween the darker gray Bscabrosa and Horquilla Limestones.

The lower one third of the limestone is light to medium- gray,

thin-bedded (1 to 3 foot beds), and lithologically variable. The upper

two thirds are consistently fine-grained, pinkish in color, and some­

what more thickly bedded than the lower part. Some red chart is present

in the lower one third of the section. The Chert occurs as bands about

25 feet above the base of the limestone, but becomes more nodular up

to about 35 feet above the base. Chert is rare in the upper two thirds

of the limestone section, occurring only as scattered nodules. The

amount of chert in the formation increases to the north.

The base of the limestone varies laterally, although throughout

the Johnny Lyon Hills a 2 foot zone containing microfossils occurs im­

mediately above it and is overlain by a dark-gray limestone pebble con­

glomerate. A light-gray limestone with scattered, angular. Chert

pebbles up to 1 inch in diameter can be seen at the contact with the

shale. This zone is less than 1 foot thick and is usually covered.

On the first ridge (see Fig. 2), this microfossiliferous zone is partly 11

silielfled, creating an oolitic appearance. Fossils and round quartz

grains stand out in relief on weathered surfaces. On closer inspection,

the oolites are sub-spherical to flattened, hollow, siliceous cases, many of which enclose minute gastropods and M illerella. The siliceous

V cases apparently were deposited around calotte grains, minute shells,

and fragments of shells. This oolitic zone also appears on the second

ridge, but is not silicified there, although further to the north it

once again becomes silic e o u s. .

Six feet of dark-gray limestone lies on an apparent erosion

surface on top of the lower two feet of fossiliferous limestone. These

beds are conglomeratic in the lower half, but have a granular, cross-

bedded appearance in the upper half.

Six feet of light-gray, ‘ very fossiliferous limestone lies on

top of the cross-bedded interval. 'This zone appears to consist entirely

of fossil fragments, minute gastropods, and other microfossils.

Six feet of covered section precedes the next unit. This poorly

exposed interval is apparently due to thin-bedded limestone or shale

interbeds. I t was never seen in good exposure.

Four feet of light-gray, fine-grained limestone with abundant

red chert bands and nodules, overlies the poorly exposed interval. A

four inch bed of fo ssilife ro u s lim estone occurs a t the base. The amount

of chert increases toward the top of the unit.

Similar to the underlying unit, but separated from it by a six

to eight inch bed of light-gray, fine-grained, finely-laminated lime­

stone, is a 5 foot zone of interbedded chert and limestone. The inter-

bedded chert and limestone is local in extent but the finely-laminated 12 limestone is characteristic and extends throughout the Johnny Lyon

Hills. It is a good marker for the fossil zone which occurs inter­ mittently just above it in the cherty zone.

Above the cherty zone lies about 30 feet of light-gray, fine to medium-grained, limestone beds which average about one foot in thick­ ness. The upper 84 feet of the Black Prince Limestone is essentially composed of 2 to 4 foot beds of pink, fine-grained, dense limestone.

Some microfossiliferous zones were observed in these beds, and a dark- gray limestone pebble conglomerate was found at 131 to I 33 feet, about half way up the pink limestone interval. The top of the Black Prince Limestone has been picked at the top of the last resistant bed of pink, fine-grained limestone in the formation. Resting on top of this upper bed is a poorly exposed in­ terval of red shale, approximately 20 feet thick, which has been as­ signed to the Horquilla Formation by Gilluly et al (1954).

Thickness

The Black Prince Limestone has been measured at three loca­ tions. These show the thickness varying from 133 feet in the Little

Dragoon Mountains, to 167 feet in the Johnny Lyon Hills, to I89 fe e t in two different measured sections in the Gunnison Hills. The thick­ ness of the clastic member at the base of the formation is about equal in the Johnny Lyon Hills and the Gunnison Hills, being 24 and 25 feet respectively. It decreases in thickness to 15 feet in the Little

Dragoon Mountains which are located about half way between the other 13 two measured sections.

Sections were measured from the base of the clastic member to the top of the pink, fine-grained limestone which underlies the shale at the base of the Horquilla Limestone. The top of the pink limestone in the three measured sections is found 55 to 65 feet below a medium to dark-gray fossiliferous zone which contains Profusulinella. On the first ridge (see Fig. 2) of the Johnny lyon Hills, a yellowish lime­ stone breccia was observed at the base of the Horquilla basal shale, and was directly overlain by a thin bed of reddish-limestone containing

Prof usulinella. Failure to find this lower fusulinid zone elsewhere is probably due to the fact that it is overlain by shales and is easily covered.

The thickness of the Blade Prince Limestone in the Whetstone

Mountains, as reported by Tyrrell (1957), varies from 1&9 to 85 fe e t.

Contact Relationships

Bscabrosa-Black Prince contactt The lower contact of the Black Prince

Limestone is characterized by a maroon colored, predominantly clastic member which varies in thickness from 15 feet to at least 27 feet. It has been suggested (Gilluly et al, 195&) that this material represents the insoluble residue of accumulation, resulting from the erosion of tens and possibly hundreds of feet of the underlying Escabrosa Limestone.

They point out that this hypothesis is supported by the relative thinness of the Escabrosa Limestone sections measured in the L ittle Dragoon

Mountains and in the Johnny Lyon H ills, especially since the lower mem­ bers of the formation do not indicate regional thinning in this direc­ tio n rH

ESCABROSA BLACK PRINCE HORQUILLA TOP OF BLACK PRINCE LS. A E F BLACK OFBASE PRINCE LS. TOP OF BLACK PRINCE SH. HEEE ZONECHAETETES FUSULINID ZONE i. - Correlation C - 3 Fig. JOHNNY LYON HILLS Gnrlsd eto* t Bak rne Limeetone Prince Black e th f o Section* Generalised f o 2 2 220 167 7 _ - 67 24 0 ITE DRAGOONLITTLE MTNS. - ■ — — ■■■ — — — — / / - I I5 -8 45 I33 0 / / GUNNISON HILLS —i 1— , z o / / ---- 1255 I26 189 25 0 35 15

Evidence to this effect, although on a smaller scale, has been „ observed by the writer in the area of this report. Locally in the

Gunnison H ills, 35 feet of pink to gray limestone lies between the base

of the Black Prince shale member and a reddish-brown dolomite (black on

fresh fracture) horizon in the Escabrosa Limestone. Lithostrotionella

is found in the upper six feet of the pink limestone, just below the

contact with the Black Prince shale member. Elsewhere in the Gunnison

Hills, 2 or 3 hundred yards to the north and south, the pink limestone

with Li thostrotionella is missing. Here the shale rests on 8 fe e t of

gray crlnoidal limestone of the Escabrosa Formation, which separates it

from the brown dolomite. Siliciftad Li thostrotionella are found locally

at the base of the Black Prince shale member in the Gunnison Hills.

Since these fossils are found only where the LIthostrotionella contain^

ing pink limestone has been removed from its position above the brown

dolomite, it is believed that they are part of the insoluble residue

left by the erosion of at least 27 feet of the overlying pink limestone.

In the Little Dragoon Mountains, the base of the shale rests on

a gray crlnoidal limestone, 10 feet above reddish-brown dolomite. There

is no evidence here of either the pink limestone or the Li thostrotionella

which occur in the Gunnison H ills.

Three or four miles further to the north, in the Johnny Lyon

Hills, the shale rests directly on a reddish-brown dolomite. There is

no indication of the pink limestone or of the Lithostrotlonella zone.

These observations permit the writer two significant interpre­

tations regarding the relationship of the Black Prince Limestone to the

Escabrosa Limestone: (1) The Lithostrotionella which have been 16

Instrumental In assigning a Mississippian age to the Black Prince Lime­ stone is actually an Escabrosa Limestone fossil. The presence of these fossils in the Black Prince Formation was caused by conditions which prevented their destruction and produced a residual concentration of their weathered remains, (hiring erosion of the underlying Escabrosa

Limestone; and (2) An erosional exists between the Esca­ brosa Formation and the Black Prince Limestone, which accounts for the removal of material above the reddish-brown dolomite member in most parts of the area of study.

Black Prlnce-Horqullla contact t The contact between the Black Prince

Limestone and the Horquilla Limestone is more difficult to locate than the contact of the Black Prince Limestone with the Escabrosa Limestone.

A 30 to 65 foot zone of poorly exposed rocks which occurs above the pinkish Black Prince Limestone, as described by Gllluly et al (195&), has heretofore served as the lithologic break between the two forma­ tions. The writer is in agreement with this placement of the contact, and feels that the presence of Atokan fusulinids (see section on Post-

Black Prince fossils) at the top of the poorly exposed zone adds paleontological support to the most obvious lithologic break.

Near the top of the shale, about twenty feet above the top of the

limestone, occurs a 2 foot bed of dark-gray limestone pebble conglomerate.

The basal Horquilla shale member and the conglomerate are best exposed

in a north-south trending gully between the first and second ridges

(see Fig. 2) of the Johnny Lyon Hills. At this locality, the coDr-

glomerate is weakly cemented and can be seen to consist of rounded, 17 dark-gray limestone pebbles which range up to 3 inches in diameter.

Above the conglomerate is another poorly exposed interval of red shale.

The bordering red shale beds accentuate the dark-gray conglomerate and make it stand out as a fairly good marker for determining the position of the top of the Black Prince Limestone. In the Gunnison Hills, the Horquilla basal conglomerate is in approximately the same stratigraphic position but is much thicker. It i s 25 feet thick and consists.of white to pink limestone pebbles in maroon to purple, shale matrix.

About 25 feet above the conglomerate, lies a 2 to & foot bed of medium to dark-gray, fossiliferous limestone which contains Profuauli- nella. This fusulinid zone is present 55 to 6$ feet above the top of the Black Prince Limestone, and extends from the Gunnison Hills to at least as far north as the second ridge (see Fig. 2) of the Johnny Lyon

Hills. The fusulinids are not so obvious in the rocks to the north as those in the Gunnison Hills, but they can be seen in hand specimen with

the naked eye.

Paleontology

Introduction; The primary objective of this project has been to study

the Black Prince Limestone with the specific purpose of determining its age. Gilluly et al ( 195&) named and described the formation, and col­

lected the following fossils from the Gunnison Hills and the Little

Dragoon Mountains sections;

.gpfrlfer cf. S. pcllaenls Weller Oomposlta humllls (Girty) Linonroductus sp. undet. 18

Punetospiriter? sp. undet. Gastropoda, indet. Lithoatrotionella sp. undet. Triplophyllites? sp. B Jurasanla? sp. undet. (Pustule)? Linooroductus sp. undet. Camarotechie? cf. C. tuta (Hiller) lAnoProductus (Norwood and P ratten) Pectinoid pelecypod Gastropods, indet. Glyptopora. n. sp.

J. S. Williams (Gillaly et el, 195*0 studied the poorly preserved and relatively undiagnostic specimens, and interpreted them as Mississippian

(late Osage or younger) in age. The TTlDloohvllites. Linonroductua assemblage, according to Williams, suggested Pennsylvanian age but did not constitute adequate evidence to justify a conclusion to

that effect. Armstrong (i 960) identified the Id thestrotlonella from

the Black Prince of the Gunnison Hills as Meramecian in age.

Collections were made by the writer in the Johnny Lyon Hills,

Gunnison H ills, L ittle Dragoon Mountains, and the Whetstone Mountains.

No faunal zones were observed in the Escabrosa Limestone within close

proximity of the Escabrosa-Black Prince contact, although two speci­

mens found near the contact were identified. A discontinuous fossi-

liferous zone was located in the Black Prince Limestone, and traced

throughout the Johnny Lyon Hills, L ittle Dragoon Mountains, and the

Gunnison Hills. A cursory examination of the Black Prince limestone

in the Whetstone Mountains did not reveal this tossiliferous zone, but

a more detailed study may do so. A fusulinid zone in the lower

Horquilla limestone persists throughout the area, and has been used

as a marker occurring about 50 feet above the top of the Black Prince

Limestone. 19 Pro-Black Prince fossils* Collections from the Becabroea Limestone have been limited to the horizons immediately below the contact with the Black

Prince Limestone* Lithostrotionella shimeri (Crickaay) has been observed in the Escabrosa limestone, ranging from 6 feet below the contact with the Black Prince Limestone, up to the contact. It has also been observed at the base of the Black Prince Shale member, and appears to be residual material which has weathered out of the Escabrosa Limestone (see section on contact relationships). The specimens of L. shimeri from the Black

Prince basal shale were identified and assigned a Meramecian age by

Armstrong (i 960).

Small which have been identified by the writer as

Tetracamera subcuneata (Halil and Tetracamera arctlrostrate (Swallow), occur at the top of the Escabrosa Limestone in the L ittle Dragoon

Mountains. These specimens are similar to those collected from the

Salem Limestone (Meramecian) of Indiana, Missouri, and Illinois, and described by Weller (I9I&).

In an attempt to date the Escabrosa Limestone below the Black

Prince contact in the Johnny Igron Hills, thin sections were made at each lithologic change for approximately 100 feet below the contact.

The limestone was made up primarily of crinoid fragments, and no identi­ fiable microfossils were found.

Previous workers agree that the Escabrosa Limestone in this area is Meramecian in age (Gilluly et al, 195k and Armstrong, i 960).

Black Prince f o s s ils : The fo s s ilife ro u s zone in the Black Prince Lime­ stone occurs between 30 and ho feet above the top of the shale member in the Johnny lyon Hills. This faunal zone was traced from the first 20 ridge in the Johnny Lyon Hills (see Fig. 2) for a distance of about two miles to the north. It was consistent in stratigraphic position and faunal content over the distance.

The most persistent genus, Chaototes, was observed in the

Johnny Lyon H ills, L ittle Dragoon Mountains, and Gunnison H ills.

Chaetetes eximlus was collected from comparable horizons in the Johnny

Lyon Hills and the L ittle Dr&goon Mountains, about 4o feet above the top of the Black Prince shale. The Chaetetes located in the Gunnison

H ills was 60 feet higher in the section, and due to recrystallization of the limestone was unidentifiable as to species. Due to similarity of occurrence, it is believed that this is the same zone found in the

Johnny Lyon Hills and the Little Dragoon Mountains. In all three loca­ tions, Chaetetes is very persistent, forming a nearly continuous zone within the Black Prince Limestone.

Six genera of corals and two genera of brachiopods have been recognized within the thin fossiliferous zone of the Black Prince

Limestone. They are included in the following list*

Chaetetes eximlus Moore and Jeffords Mlchelinia ssfiomiSSS Moore and Jaffords Analexo carinia corrugate (Mather Dlbanoohvlltnn ? inauditun Moore ami Jeffords Pseudozaphrentoides nitellus Moore and Jeffords Neokoninckophvlltm arcuatum Moore and Jeffords

Composita subtillta(Hall) Compos-i ta ovata Mather Bplrif er sp.

In addition to the fauna listed above, two diagnostic micro­ fossils have been found in thin sections which were made at each litho­ logic change within the measured section in the Johnny Lyon H ills. 21

Mlllerella cl. 1$. raorblensls was found In nearly every one of the thin sections and occurs throughout the Black Prince Limestone. Specimens of Plectoovra sp. were observed In thin sections from 6 different hori­ zons within the formation. The lowest occurrence was 12 feet above the top of the shale member, and the highest occurrence was 27 feet below the top of the Black Prince Limestone. ,

The Black Prince Limestone in the Whetstone Mountains was not studied in detail, and only a few random samples of the limestone were taken. No identifiable microfossils were observed in thin sections of the samples, but there is no reason to believe that the Whetstone

Mountains section of the Black Prince Limestone is unfossilif erous., The zone of Chaetetes and other corals, which is persistent in other ex­ posures of the Black Prince limestone, was not located in the Whetstone

Mountains. Chaetetes. Amplexocarinia. and Michelinla were the only speci­ mens of corals collected from the Black Prince Limestone, which were weathered, out of the rock. Pseudozaphrentoldes. Dibunoohvllum. and

Neokoninckonhvllum were not slllcifled and had to be thin sectioned as a part of the rock. As a result, only a single complete specimen each of Dlbunophvl 1 urn and Neokoninckonhvllum were available fo r study. Each of the specimens is nearly complete, well preserved, and well oriented along the longitudinal axis. Three specimens of Pseudozaphrentoldes were available for study, one of which is a complete longitudinal sec­ tion. Numerous silicified specimens of Chaetetes eximius. Amnlexocarinj and Michelinla were collected from the Black Prince Limestone and were studied, 22

Brachipods collected from the Black Prince Limestone are not so diagnostic as the corals. Specimens collected have been tentatively identified by the writer as subtllita (Hall), Composite ovata

Mather, and Snirifer sp. According to Shizaer and Schrock (lp&&), Composite s u b tllita is

Pennsylvanian in age. Ransome (1904) lists the species as being characteristic of the Horquilla Limestone (Pennsylvanian) of southeastern

Arizona.

According to Dunbar and Chondra (1932), Composite ovate was described from Morrowan beds of Arkansas and Oklahoma, but i t ranges up

into beds of Virgil age. Numerous specimens of (Rhombonora?!. minute gastropods,

and one probable conodont were observed in thin sections of the lime­

stone.

One sample of limestone, and five samples of shale were pro­

cessed for conodonts, but no identifiable specimens were found.

Post-Black Princa fossilsi Fusulinids collected from 2 feet above the

top of. the Black Prince Limestone have been identified by the writer as

, Profusullnella cf. £. anodacensis Thompson, and Pseudostaffella cf. £.

naadhsat Thompson. Fusulinids were found in this horizon only on the

first ridge of the Johnny Lyon Hills (see Fig. 2).

The next higher and more persistent fusulinid zone occurs from

55 to 65 feet above the top of the Black Prince Limestone, in the

Johnny Lyon Hills and the Gunnison H ills. A fusulinid zone was ob­

served in the same stratigraphic position in the little Dragoon Moun­

tains, but specimens from that locality were not identified. The 23 fusulinids in this zone from the Gunnison Hills have been identified by H. W. M iller as P rofusitlinella of. P. apodacensis. The same zone in the Johnny Lyon Hills has yielded £. apodacensis. Profusulinella cf.

P. coaiosa Thompson and Eoschubertella c f. E. mezicana Thompson.

These forms all made their appearance at or before the begin­ ning of A toll an time, and Prof usulinella disappeared at the end of

Atoken time (Thompson, 1968). These fossils indicate Atoken age for

the basal Horquilla beds.

Chaetetes faro bus was observed in association with Profusulinella. about 30 feet above the top of the Black Prince Limestone in the Gunnison

H ills. According to Moore and Jeffords (19&5)» £• favosus is. character­

istic of the Atokan portion of the Marble Falls Limestone of San Saba county, Texas.

Plectoovra sp. was found in the fusulinid zone, 30 feet above the

top of the Black Prince Limestone, therefore this genus ranges through­ out the Black Prince Limestone .and into the.Horquilla Limestone.

According to Gilluly et al (192&), the maximum age of the Hor­

quilla Limestone in the Gunnison Hills is post-Morrowan, either

Lampasan or Des Moinesian. Henbest (in G illuly e t a l, 1954) describes

Fusullnella from 10 feet above the base of the Horquilla Formation in

the Gunnison H ills, as indicating "lower middle (Atokan) Pennsylvanian

age." Williams stated that some species typical of Morrowan age have

been Identified, but that they were usually associated with other

f o s s ils ty p ic ally of Lampasan or Des Moinesian age, or were found s t r a ti -

graphically above the®. He believed that the identifications based on

incomplete material may be in error, or else the Morrowan forms may zb represent extensions of their characteristic ranges.

Age and Coyy^l^t^on of tha Black Prinee Limostot^t The presence of

M illerella sp. in the Black Prince Limestone indicates that the forma­ tion cannot be older than middle Chesteran. According to E. J. Zeller

(1950), the genus Millerella first appeared at that time. Plectoavra sp. is also present in the limestone, and closely resembles Pennsyl­ vanian forms as illustrated by Doris Zeller (1953)•

The assemblage of coelenterates, including Chaetetes and the other corals from the lower one-third of the Black Prince Limestone, correlate that portion with the Marble Falls Limestone (Morrowan-Atokan) of central Texas. Five species of corals collected from the Black

Prince limestone are identical to corals described from the Morrowan portion of the Marble Falls Limestone. One species from the same hori­ zon within the Black Prince Limestone was found in Atokan beds of the

Marble Falls Limestone. As a whole, the assemblage indicates

Morrowan age for the Black Prince Limestone.

In the past, there has been a tendency to correlate the Black

Prince Limestone with the Paradise Formation which is exposed in the

Chiricahua Mountains of eastern Cochise county, Arizona, This correla­ tion has been based primarily on the similarity in stratigraphic posi­ tion of the two formations, since they both lie between the Escabrosa

Limestone and the Horquilla limestone.

The age of the Paradise Formation has been well established as

Chesteran (Hernon, 1935; Stoyanow, 1936; Zeller, 1957; and others).

The evidence from the present study, as interpreted by the writer, in­ 25 dicates Morrovan age for the Black Prince Limestone and effectively separates it from the Paradise Formation. It is possible that the basal shale member of the Black Prince Limestone may be correlative with the Paradise Formation, but no paleontological evidence has been found to support this hypothesis. CONCLUSIONS

A field and laboratory study of the Black Prince Limestone has % led the writer to the following conclusions.

1. The Black Prince Limestone is Morrowan in age.

2. The Lithostrotionella shimeri fossils found in the basal

Black Prince shale member were originally Escabrosa Limestone fossils. 3. The occurrence of Cha*t*taa favosus and Profusulinella at the base of the Horquilla Limestone indicates that the lower part of the formation is Atokan in age, and that there is no significant time break between the Black Prince Limestone and the Horquilla Limestone. 4. The shale member which serves as the lithologic break be­ tween the Black Prince Limestone and the Horquilla Limestone is not unique in the Pennsylvanian section, therefore the validity or necessity of the term "Black Prince Limestone" as a formation name should be re­ viewed.

5. The Johnny Lyon Hills exposure of the Black Prince Lime­ stone should be established as the standard section.

26 27

Period Series Formation

Atokan Horquilla Limestone

Horrowan Black Prince Limestone Pennsylvanian

c

$m Heramecian Escabrosa Limestone •H •Q 5

Fig. 1* - Age Relationship of the Black Prince Limestone to the Horquilla and Escabrosa Limestones APPENDIX A

PALEONTOLOGICAL DESCRIPTIONS

C o rS lS : Amnlexocarinla eorraoata (Mather)

P la te I Fig.- ^—6—7

Aaplexas corruaatus Mather, 1915, Denison Univ. Bull., Jour. Sci.

Labs., Vol. 18, p. 90, pi. 1, Figs. 7-10.

Descriptionr Solitary corals. Snail corallite, conical near apex, becoming cylindrical in mature section. Calyx in most complete specimen is fairly deep', with broad flat floor which dips steeply at contact with short, evenly spaced septa. There are 17 septa which ex­ tend 1/4 of the distance to the axis of the corallite. Septa con­ siderably thinner than outer wall of corallite. Largest incomplete specimen in 20 millimeters long, 5 millimeters wide.

%itheca rugose, with local constrictions in mature cylindrical specimens. Nor vertical striations or markings on outer surface of sillcifled specimens, but septal grooves are evident in thin section.

In longitudinal, axial thin section, the tabulae are seen to be numerous---- 26 in l4 mm. specimen. The tabulae are generally perfectly f l a t fo r 3/5 of diameter of the corallite, then turn abruptly downward to join the corallite wall, or to join the next lower tabula. A defi­ nite inner wall is formed, both in longitudinal and in transverse seo-

28 29 tion, by the junction of tabulae with each other, and with the septa.

Between the inner and outer walls, the tabulae are generally inclined

30 to degrees to the axis, some appearing as extensions of the down turned portion of the flat tabulae, and some appearing as independent tabulae, joining the inner wall at random points.

In one thin section the tabulae are not horizontal, but all slope in the same direction, and are characterized by steeply dipping outer margins which join the wall of the corallite. Since the orien­ tation of the transverse thin sections is unknown, the difference in slope of tabulae could be due to different orientation in relation to the cardinal septum. The inner wall is well formed in this specimen, especially in transverse section. There are 17 septa present.

Occurrencet Forty feet above top of shale member. Black Prince

Limestone. Collected throughout the Johnny Lyon Hills. Occur inter­ mittently at this level, from the first ridge (see Fig. 2) in the

Johnny Lyon Hills for a distance of at least two miles to the north.

Mlchellnla gcoroulosa Moore and Jeffords

Plate I Fig. 2-3

Michelinia euoeneae White. Mather, (part) ’< 1915» Denison Univ. Bull.,

Jour. Sci. Labs., Vol 18, p. 96, pi. 1, Figs.17, 17a, pi. 2, Fig. 1.

Michelinia scomulosa Moore and Jeffords, 19&&, Texas Univ. Bull. &&01, p. 169, F igs. I 7&-I76.

Descriptiont Small, compound corals. Largest colony measured was 30 mm. in diameter and 10 mm. high, but most were half this size.

Shape is irregular, although several hemispherical forms were observed. 30

Corallites grow upward and outward from center, and reach a maximum diameter of 3 ram. The calicos are & to 6 sided, and reach a depth equal to their diameter. Small openings are present in the corallite wall, which may be mural pores. No septa were observed in any of the specimens.

In thin section, approximately normal to the axis of the corallites, the polygonal pattern made by corallite walls forms a honey­ comb pattern. Shadowy, curving lines within this network indicate the irregularity of the tabulae. In longitudinal section, the corallites can be seen to expand slightly in diameter away from the center of the colony, but none are larger than 3 ram. Tabulae are numerous (10 in 6 ram. of corallite), and are about normal to the axis of the corallite, with some slig h tly bowed up or down.

The corallite walls are thick, often attaining a thickness of

1/2 ram. Tabulae are much thinner than the walls.

Occurrencei Forty feet above the top of the shale member,

Black Prince Limestone. Occurs intermittently throughout the Johnny

Lyon H ills, north of Cascabel Road.

Chaatetes aximlus Moore and Jeffords

Plate II Fig. 5-6

Chaetetes railleooraceous Edwards and Haiae, 1851, fo r discussion of synonymy, see Moore and Jeffords, 19&&, Texas Univ. Bull. 6&01, p. 191.

Chaetetes eximius Moore and Jeffords, iphUt Texas Univ. B ill. &&01, p. 191, Figs. 207, 208.

Description: Low, massive colonies, with horizontal dimen­ sions greater than the vertical. Colonies commonly closely spaced. 31 forming a nearly continuous zone in the rock.

In transverse section, the corallites measure about 1/2 mm., have thick, beaded walls, and form a honeycomb pattern of 5 or 6 sided polygons of approximately equal size. Longitudinal section shows closely, and fairly evenly spaced tabulae. There are commonly

5 or 6 tabulae for each mm. of corallite length. The tabulae are ex­ tremely thin, appearing as fine dark lines across the corallite, and do not necessarily occur at the same level in adjacent tubes.

Occurrence? This coral occurs in an intermittent yet persis­ tent zone throughout the L ittle Dragoon Mountains, and Johnny Lyon

Hills. The genus was observed at a higher level in the Gunnison Hills.

It was recrystallized and unrecognizable as to species but due to stratigraphic position is believed to be a continuation of the C. ezimlus zone.

I t occurs ho feet above the top of the shale member of the

Black Prince Limestone, intermittently throughout the Johnny Lyon

Hills and Little Dragoon Mountains. It probably occurs 100 feet above the top of the shale in the Gunnison Hills.

Chaetetes favosus Moore and Jeffords

Plate II ;?ig. 3-U Chaetetes milleooraceous Edwards and Haime, 1851; fo r discussion of synonymy, see Moore and Jeffo rd s, 19&&, Texas Univ. B ull. # 0 1 , p. 191.

Chaetetes favosus Moore and Jeffords, 19# , Texas Univ. Bull. #01, p. 193, Figs. 209, 210.

Description! In growth habit, this form of Chaetetes is 32 higher and more massive than j*. eximius. The specimen collected mea­

sures 6 inches in height and h mm. across the widest part.

In transverse section, the corallite walls are noticably thinner

than in 5* exlmius and the beading is finer. The diameter of corallites

is nearly equal in the two species, about 1/3 to 1/2 mm. In longitu­

dinal section, the corallites have very few and widely spaced tabulae.

In the basal 6 mm., the corallites have about 5 tabulae per mm., but

about half of them are incomplete, reaching only part of the distance

across the corallite. Above this brief basal portion, tabulae are seen

only occasionally, with some tubes apparently having none.

Occurrence! Found 30 feet above the top of the Black Prince

Limestone in Horquilla Limestone, south side of western slope of main

peak, Gunnison Hills. Associated with Profusulinella.

Pseudozaphrentoides Moore and Jeffords

Plate I Fig. 1

Pseudoz^n^yo^toides nitmiins Moore and Jeffords, 1$&&, Texas Univ.

Bull. Woi, p. 151, Figs. 1&5, 1*6.

Description! One nearly complete axial, longitudinal section

was observed in thin section., Specimen was not weathered out of the

rock, therefore a complete description is not possible.

The corallite is 30 mm. in length, 15 mm. in diameter at the

calyx. Shape conical, increasing rapidly in diameter near the base,

more gradually in mature portions. Epitheca rugose. Calyx is 5 am.

deep with gently arched floor.

In transverse section, about 25 septa extend 2/3 of the dis­ tance to the axis. They are joined at the ends by curving tabulae 33 which form a continuous inner wall surrounding the inner tabulate zone.

Minor septa are located between the major septa and extend only slight­ ly beyond the disseppimentarium. The outer tabulate zone is well de­ veloped between the disseppimentarium and the wall of the inner tabu­ late zone. The disseppimentarium is relatively thin, extending 1/4 of the distance to the axis. In longitudinal section, a very distinct pattern is formed by the inner tabulate zone, bordered by the outer tabulate zone on each side, and the disseppiment zone which forms the wall of the corallite.

The spacing of tabulae i s 10 per 5 mm. of ax ial length. The tabulae turn down very abruptly at the ends, joining those below, and thereby forming a definite inner wall. Between the inner wall and the dis­ seppimentarium, there exists a zone about 2 mm. in width which is occupied by nearly horizontal tabulae. Some are slightly inclined toward the axis, and gently arched upward. Some appear to be exten­ sions of tabulae from the broad central zone, but more commonly they jo in the downturned tabulae a t random points.

Outside of the outer tabulate zone exists the outer wall of the corallite, which is made up of a disseppimentarium. The disseppiments dip very steeply toward the axis of the corallite. They average 1 mm. in length, although a few are .2 mm. in length. The epitheca is rela­ tively rugose, due to local fluctuations in thickness of the dis­ seppimentarium. The three zones decrease proportionally in thickness toward the base of the corallite.

Occurrence: Found about 4o feet above the top of the shale member of the Black Prince Limestone, in the L ittle Dragoon Mountains. 3*

Located at base of south slope of ridge north of 7 Bar Ranch road.

Also occurs &0 feet above top of shale member. Black Prince Limestone, north side of first ridge north of Cascabel Road, Johnny Lyon Hills.

Di hnnonhvllum ? inardi turn Moore and Jeffords

Plate I Fig. U

Dibonophvllma ? inauditum Moore and Jeffords, I9M, Texas Hniv. Bull.

#01, p.157, Fig. 1&6.

' I dtio n 1 This specimen has been studied in thin section only. It was not found weathered out of the rock, therefore adequate description of the external features is not possible.

It is a solitary coral, 26 mm. in length and 15 mm. in width at the calyx. Conical in shape, slightly curved near the apex.

Epitheca partly missing, but appears only slightly rugose. Calyx 3 mm. deep at sides, with low peaked columella which rises nearly level with the outer walls.

In transverse section, 35 septa can be seen, most of which ex­ tend 3/k of distance to the axis. Eight or 9 of the septa join at the axis, becoming thicker in the axial region. The septa are relatively thin and crooked in the disseppimentarium, but thicken abruptly at the inner margin, then gradually become thinner toward the a x is. The dis­

seppimentarium extends 1/3 of the distance to the axis. The columella is prominent in longitudinal section. The upper

2/5 of the columella is formed by the junction of the thickened tabulae.

The lower 3/5 of the columella is formed by a simple box work of tab­

ulae which occupy lA of the diameter of the corallite. The columella 35 at this point has definite outer walls which enclose the box. work struc­ ture of the columella. Tabulae extend from the wall of the eorallite to the columella, rising constantly, and commonly anastomosing with the other tabulae.

A dlssepplmentarium is present in the upper 2/3 of the eorallite wall, but gradually thins toward the base and disappears from the lower

1/3 of the eorallite. The dissepiments dip steely toward the base of the eorallite, and are convex inward. The dissepiments are not numerous and average more than 1 mm. in length.

The eitheca is thick at the base of the eorallite, and con­ tinues to be thick between the tabulae and the disseppimentariurn.

Apparently there is no epitheca outside the dlssepplmentarium, as many of the disseppiaents have thickened-inner walls and a thin dark line which appears to be an outer layer. Both layers thin gradually to­ ward the outer terminus of the dissepiment, with no evidence of having joined an outer thecal wall which may have been removed by weathering.

Occurrence: Found ko feet above top of shale member. Black

Prince Limestone, north side of first ridge (see Fig. 2), north of

Cascabel Road, Johnny Lyon H ills.

JSSS2k22tiLBiSSLBbXllHB arcuatmn Moore and Jeffo rd s Plate III Fig. 1-2-3 Naakoninckophvllmn arenaturn Moore and Jeffords, IphU, Texas TJniv.

Bull, tool, p. l 6l, Figs, 162-164.

Description: Large, cylindrical, solitary coral. Specimen measured is incomplete, over 50 mm. in length, 24 mm. in width. Width 36 fluctuates considerably due to the extremely rugose nature of the epltheca. Transverse section of one specimen vas 30 mm. in diameter.

Calyx not observed. In transverse section, &0 septa can be seen extending 2/3 of the distance to the axis. The septa are thin In the dlssepplmentarlum, thicken abruptly at the inner margin, and remain thick toward the axis, although some thinning does occur. Disseppiments cross the septa di-• agonally. Some septa appear to continue to the columella as thin lamellae. Columella has an enclosing wall, inside of which the anas­ tomosing tabulae from the intricate network of the columella.

In longitudinal section, the tabulae are horizontal or slightly inclined for 3 to 5 mm. in from the inner wall of the dlssepplmentarlum.

They then turn abruptly and steeply upward, to form an intricate, inter­ woven mass of thickened tabulae which forms a prominent columella. The

disseppimentarium consists of numerous, steeply dipping, convex inward,

large disseppiments. . The thickness fluctuates radically, forming a very Irregular outer surface. The epitheca is approximately 1/2 mm. in

thickness. Occurrence! Longitudinal section of specimen taken 35 feet

above top of shale member, Black Prince Limestone, south slope of ridge

north of 7 Bar Ranch Road, L ittle Dragoon Mountains. Associated with

£. nitellus. C. eximius. M. marblensis. Plectoavra. Chaetetes

has used H. arcuatum as a base for growth. 37

Foraninifera:

Plectoavra sp. indet. Zeller

Plate III Fig. 6

For synonymy see Zeller, E. J ., 1950, Stratigraphic Significance of Endothyroid Foraminifera; Univ. Kansas Paleont. Contrib., Protozoa,

Art. &, pp. 1-23. J2g4sriji£j£Bf. Specimens rare, identified only in sagittal sec­ tion, Small, O.h mm. across widest diameter normal to axis of coiling.

Measured specimen had 2 1/2 volutions; 19 chambers observed. Septa curve backward, forming rounded chambers with prominent constrictions in outer shell where each septum joins it.

Aperture about 1/3 height of last chamber. Secondary deposits are not obvious, but low mounds can be seen on the floor of the last two chambers, and local thickening may have occurred on floor of other chambers.

Occurrence: Seen in thin sections from 6 horizons; 12, 62, 72,

116, and l 6o feet above the top of the shale member. Black Prince Lime­ stone, measured section on top of second ridge north of Cascabel Road,

Johnny Lyon Hills, (see Fig. 2). Also found in Profusulinella zone of

Horquilla Limestone, 30 feet above the top of the Black Prince Lime­ stone, same locality.

uncoiled Plectoavra?

Several uncoiled forminifera have been found in the Black

Prince Limestone, which appear to have certain affinities with Plecto­ avra. The writer has been unable to find reference to such specimens 38 in the literature and believes that they say be undescribed. The speci­ mens and the following descriptions will be sent to specialists for identification.

Description! Specimens are coiled only in immature portion.

The shell is 1/3 to 1/2 mm. in width (normal to axis of coiling, and consists of & or 5 chambers. The smaller chambers were indistinct, therefore it could not be definitely determined if the coiling was of endothyroid nature or not. The siz e of each succeeding chamber in­ creases very, rapidly. Secondary deposits are not obvious, and no aperture was observed.

OccurrMice! Found 81 fe e t above top of shale member, Black

Prince Limestone, measured section on second ridge (see Fig. 2) north of Gascabel Road, Johnny Lyon H ills .

Ml H e r el la c f. II. m arblensis Thompson, lyhz

Plate in Fig. 5 For synonymy of Mi H e r cl la and other f usulinids see Thompson, M. L .,

19&8, Studies of American Fusulinids: Univ. Kansas Paleont. Contrib.,

Protozoa, A rt 1, pp. 1-18&.

Description: Plainspiral coiling, 1/2 mm. in width normal to axis of coiling. Measured specimen has 3 volutions, ko to 50 chambers.

In sagittal section, the specimen is nearly round in outline.

Septa curve backward, and are very numerous. First 2 or 3 volutions in­ volute, later ones evolute. Edges usually bluntly pointed, although a few specimens are broadly rounded at periphyry.

Occurrence! Specimens were observed in a majority of the thin sections of the Black Prince Limes to nein measured section, top of second ridge (see Fig. 2), north of Caseabel Road, Johnny Lyon Hills.

Also observed in Horquilla Limestone thin sections.

Profusulinella cf. P. ooniosa Thompson, 1950

Ellipsoidal shell, 1 mm. long, 0.6 mm. vide, k volutions. Poles rounded. Septa sparsely located along axis, unfluted.

Chomata low and poorly developed, steep on tunnel side, gentle slopeto­ ward poles. Proloculus relatively large. Wall structure not distinct, but appears to be profusulinellid type.

Occurrencet Found in fusulinid zones 2 feet and 51 feet above top of Black Prince Limestone, measured section on second ridge (see

Fig. 2) north of Caseabel Road, Johnny Lyon Hills.

Pseudostaffalia cf. P. needhami Thompson. I 9&2

Description: Shell minute, 0.3 nn. long, 0.3 mm. wide, 2.5 volutions. Periphyry nearly round, with polar regions depressed. Chomata present but not massive. Wall structure indistinct, but appears to be of profusulinellid type.

Occurrence* Found 2 feet above top of Black Prince Limestone, measured section on second ridge north of Caseabel Road, Johnny Lyon

H ills .

. Eoschubertella c f. E. mexicana Thompson. 1950

Description* Shell minute, 0.5 mm. long, 0.& mm. vide, 2.5

volutions. Proloculus minute. Apparent change in axis of coiling. Shell elongated. Chomata low, tunnel Indistinct, septa straight.

Occurrence t Found In fusulinld zone 51 feet above top of Black

Prince Limestone, measured section on second ridge north of Cascabel

Road, Johnny Lyon H ills.

Profaaulinella cf. Jg. anodacensls Thompson, 1950

Descriptioni Shell 2.8 mm. long, l»h mm. wide, convex in cen­ tral 2/3, concave poleward. Poles bluntly pointed. Six volutions, pro­ loculus small. Septa fluted along axis of coiling, especially at poles within last two volutions. Chomata massive, commonly reaching one half the height of the chambers. Chomata steep on tunnel side, slope gently toward the poles. In early volutions, chomata extend half way to poles.

In later volutions the chomata are short in poleward extent. Tunnel ireregular. Wall structure appears to be profusulinellid type in first

3 or & volutions, fusulinellid type in later volutions.

Occurrencet Observed in zones 2 feet and 51 feet above top of

Black Prince Limestone, measured section on second ridge north of Cascabel

Road, Johnny Lyon Hills. Also observed 30 feet and 65 feet above top of

Black Prince Limestone on west slope of main peak, Gunnison H ills. Re­ ported from lower Horqullla Limestone in Whetstone Mountains, by Tyrrell

(1957). APPENDIX B

MEASURED SECTIONS

Johnny Lyon H ills Section Total thickness 16?'

Locationi Top of second B-W trending ridge (see Fig. 2) north of

Cascabel Road, Johnny Lyon H ills, Dragoon Quadrangle, Cochise County,

Arizona. SW 1/4, SW 1/4, HE 1/4, Sec. l 6, T. l4 S ., R. 21 E.

218 Fusulinid zone

192-194 Conglomerate, limestone-pebble, light-gray

167-192 cover

TOP OF BUCK PRINCE LIMESTONE

133-167 Limestone, pink, fine-grained, beds 2-4 feet

131-133 Conglomerate, limestone-pebble, light-gray matrix and dark- gray pebbles

83-131 Limestone, pink, fine-grained, 1-3 foot beds

81- 83 Limestone, light-gray, fine-grained 76- 81 Limestone, light-gray, fine-grained, fossiliferous, some black

chert nodules

69- 76 Limestone, medium-gray, medium-grained

67- 69 Limestone, brownish-gray, coarse-grained, fossiliferous

65- 67 Limestone, light-gray, fine-grained. Chaetetes

41 63- 65 Limestone, brownish-gray, crinoidal

57- 63 Limestone, light-gray, fine-grained

5&- 57 Limestone, light-gray, crinoidal

A9- 5ft Limestone, light-gray, fine-grained, finely-laminated, thin-

bedded with red chert interbeds &5- kp Limestone, light-gray, fine-grained, fossiliferous at base,

cherty red bands and nodules increase toward top

39- &5 Cover 33- 39 Limestone, light-gray, very fossiliferous

26- 33 Conglomerate, limestone-pebble, dark-gray, appears granular

and cross-bedded near top zh- 26 Limestone, light-gray, dense, conglomeratic at base, appears

o o litic

8- 2& Shale, maroon 3- 8 Limestone, maroon, cherty (has sandstone appearance)

0- 3 Cover ESCABROSA LIMESTONE

Dolomite, reddish-brown

Gunnison H ills Section

total thickness I 89*

Location: In gully slightly north of western slope of main peak,

Gunnison H ills, Measured approximately along line separating NW 1/4 and SV 1/4 of Sec. 4, T. 16 S., R. 23 B., Dragoon Quadrangle, Cochise County, Arizona.

242-255 Limestone, medium to dark-gray, medium-grained, fossiliferous, Fusulinids a t 255 215- 2&2 Shale, green; and limestone-pebble conglomerate, maroon matrix

with white to pink limestone pebbles, green on weathering

189-215 Shale, red, covered

TOP CF BUCK PRINCE LIMESTONE

171-189 Limestone, pink, line-grained

167-171 Limestone, pink, fine-grained, greenish in upper half 163-167 Conglomerate, limestone-pebble

156-163 Limestone, white to pink, fine-grained 150-156 Conglomerate, limestone-pebble, maroon matrix with white lime­

stone pebbles, weathers greenish

165-150 Limestone, white to pink, fine-grained

163-165 Conglomerate, greenish-maroon, maroon matrix 131-163 Limestone, light-gray to pink, fine-grained

130-131 Conglomerate, limestone-pebble, maroon, maroon matrix with pink limestone pebbles

121-130 Limestone, light-gray to pink, fine-grained, at 126

fe e t

117-121 Limestone, pink, conglomeratic at base, chert in middle

100-117 Limestone, light-gray, fine-grained 99-100 Shale, dark-maroon, fossiliferous

90- 99 Limestone, pink, fine-grained, dense 86- 90 Limestone, pink, conglomeratic, dark-gray at top w

82- 86 Limestone, dark-gray, fine-grained, with chert

80- 82 Limestone, with thin, wavy greenish bands

78- 80 Limestone, pinkish, crinoidal

70- 78 Limestone, pink to medium-gray, fine-grained

66- 70 Limestone, fossiliferous, pink at base, greenish-shale in

middle, dark-gray bands at top

62- 66 Limestone, medium-gray, crinoidal, mottled

6l - 62 Limestone, reddish, fossiliferous, with thin shale partings

57- 6l Conglomerate, limestone-pebble, maroon

53- 57 Limestone, medium to dark-gray, mottled

67- 53 Limestone, medium-gray, crinoidal h6- 47 Shale, maroon, hard 38-46 Limestone, dark-gray, conglomeratic at base

35- 38 Limestone, pink, fine-grained

31- 35 Limestone, medium-gray, medium-grained

25- 31 Conglomerate, limestone-pebble, dark-gray

0- 25 Shale, maroon, with large chert nodules or boulders.

lithostrotlonella found at base

TOP OP ESCABHOSA LIMESTONE

6- 0 Limestone, pink, fine-grained. Lithostrotlonella 3 fe e t be­

low top REFERENCES

Armstrong, A.K., i 960, Paleontology and Stratigraphy of the Mlsslssip- pian System In S.W. New Mexico and S.E. Arizonat Ann Arbor University Microfilms, Cincinnati Univ. doct. diss. published on microfilm.

Cook, F .S ., 1938, Geology of the Seven Dash Ranch Area, Cochise County, Arizona» Univ. of Arizona unpublished masters thesis.

Dunbar, C.O., and Chondra, G.B., 1932, Brachiopoda of the Pennsylvanian System in Nebraskas Nebraska Geol. Survey, Bull. 5, Ser. 2, PP. 363-371, pi. XLIII, Figs. 7-19. Easton, V.H., and Gutschlck, R.C., 1953, Corals from the Redwall Lime­ stone (Mississippian) of Arizonai Bull. So. California Acad. Sci., Vol. 52, pt. 1, pp. 1-33* ' fv" Gilluly, James, 1956, General Geology of Central Cochise County, Arizona* U.Se Geol. Survey Prof. Paper 266, pp. 29-52.

Gilluly, James, Cooper, J.R., and Williams, J.S., 195^, late Paleozoic Stratigraphy of Central Cochise County, Arizona* U.S. Geol. Survey Prof. Paper 281, pp. 13-15* Hernon, R.M., 1935, The Paradise Formation and its Fauna* Jour. Paleontology, Vol. 9, No. 8, pp. 653-696.

Jeffords, R.M., 1952, Lophophyllid Corals from Lower Pennsylvanian Rocks of Kansas and Oklahoma* Bull. Kansas Geol. Survey, Vol. &1, pt. 5, PP. 185-260.

Moore, R.C., et a l, 1953, Treatise on Invertebrate Paleontology (G) Bryozoa* Geol. Soc. America and Univ, of Kansas.

. 1956, Treatise on Invertebrate Paleontology (F) Coelenterata* Geol. Soc. America and Univ. of Kansas.

Moore, R.C., and Jeffo rd s, R.M., I95&, Description of Lower Pennsyl­ vanian Corals from Texas and Adjacent States* Texas Univ. Bull. Mroi, pp. 63- 208.

Moore, R.C., Lalicker, C.G., and Fischer, A.G., 1952, Invertebrate Fossils* McGraw-Hill, New York.

*5 46

Ransone, F.L., I90&, The Geology land Ore Deposits of the Bisbee Quad­ rangle, Arizona: U.S. Geol. Survey Prof. Paper 21.

Sabins, F.F., 1957, Stratigraphic Relations in Chiricahua and Dos Cabezas Mountains, Arizona: Bull. Amer. Assoc. Petrol. Geol., Vol. 4l, Ho. 3, PP. 446-510. S cott, H.W., Z eller, E .J ., and Z elle r, D.E.N., 1957* The Genus Endothyra: Jour. Paleontology, Vol. 21, No. 6, pp. 557-562.

Shimer, H.W., and Schrock, R.R., 1944, Index Fossils of North America: John Wiley and Sons, New York. Stoyanow, A.A., 1936, Correlation of Arizona Paleozoic Formations: Bull. Geol. Soc. America, Vol. 47, pp. 459-540.

Thompson, M.L., 194?, Stratigraphy and Fusulinids of Pre-Desmoinesian Pennsylvanian Rocks, Llano Uplift, Texas: Jour. Paleontology, Vol. 21, No. 2, pp. 147-164.

. 1948. Studies of American Fusulinids: Univ. Kansas Paleont. Contrib., Protozoa, Art. 1, pp. 1-184.

Tyrrell, W.W. ,J r., 1957* Geology of the Whetstone Mountains Area, Cochise and Pima Counties, Arizona: Yale Univ. unpublished doctoral th e s is .

Weller, Stuart, 1914, Mississippian Brachiopoda of the Mississippi Valley Basin: Illinois Geol. Survey, M 1:1, pp. 214-215, pi. XXVIII. Zeller, D.E.N., 1953, Endothyroid Foraminifera and Ancestral Fusulinids from the Type Chest wan: Jour. Paleontology, Vol. 27, No. 2, pp. 183-199. Zeller, E.J., 1950, Stratigraphic Significance of Mississippian En­ do thyroid Foraadnitera: Univ. Kansas Paleont. Contrib., Protozoa, Art. 4, pp. 1-23.

. 1057. Mississippian Bidothyroid Foraainifera from the Cordilleran Geosyncline: Jour. Paleontology, Vol. 31, No. 4, pp. 679- 704. PUTS I

Figures*

1. PseudQgpp^fftntoidea nitellus Moore and Jeffords, specimen number UA 2, from the Black Prince Limestone on western slope of Gunnison Hills, Cochise County, Arizona. Long­ itu d in a l section. Specimen i s 30 mm. long and 15 mm. vide.

2-3. mchelinia seornulosa Moore and Jeffords, specimen number TJA 3, from the Black Prince Limestone north of Cascabel Hoad, Johnny Ifon Hills, Cochise County, Arizona. Trans­ verse section (2), and longitudinal section (3). Specimen i s 12 mm. in d im eter and 10 mm. high.

k. thbunophvllum ? Inauditum Moore and Jeffords, specimen num­ ber UA 6, from the Black Prince Limestone north of Cascabel Hoad, Johnny Lyon H ills, Cochise County, Arizona. Long­ itudinal section. Specimen is 26 mm. long, 15 am. wide.

5-6-7» AmnleTPcartnia eorruoata (Mather), specimen number UA 5, from the Black Prince Limestone north of Cascabel Road, Johnny Lyon Hills, Cochise County, Arizona. Longitudinal sections (5 & 7), transverse section (6). Specimen 5 & 6 i s 10 am. long, 4 mm. vide. Specimen 7 is 15 mm. long, 3 mm. wide.

1

PLATE II

Figuresi

1-2. T,4thft«trotlonella shlmeri (Crickmay), specimen number UA 6, from the Black Prince and Escabrosa Limestones on western slope of the Gunnison H ills, Cochise County, Arizona. Longitudinal section (1), transverse section (2). Largest corallite in Fig. 2 is 11 zm. at maximum dim eter.

3-1}. Chaotetes -favoaus Moore and Jeffo rd s, specimen number UA 7, from Horquilla Limestone on western slope of the Gunnison Hills, Cochise County, Arizona. Longitudinal section (3), transverse section (&). Dimeter of largest corallite is approximately 0.5 mm.

5-6. p rlalu s Moore and Jeffo rd s, specimen number UA 8, from Black Prince Limestone north of Cascabel Road, Johnny Lyon Hills, Cochise County, Arizona, longitudinal section (5), transverse section (6). Dimeter of largest corallites is approximately 0.5 mm. 50

m m PLATE I I I

Figures!

1-2-3. Neokonlrififrftnhvllmn arena turn Moore and Jeffo rd s, specimen number VA 9, from the Black Prince Limestone on south slope of ridge north of Seven Bar Ranch Road, L ittle Dragoon Mountains, Cochise County, Arizona. Transverse sections (1 & 3), longitudinal section (2). Diameter of Fig. 1 is 20 mm. F ig. 2 i s 23 mm. maximum width, 50 mm. lo n g .' Fig. 3 maximum diameter i s 30 m .

&, Prefustilinella nnftri«n«msl a Thompson, specimen number UA 10, from Horquilla limestone north of Cascabal Road, Johnny Lyon Hills, Cochise County, Arizona. Random orientations. Maximum length i s 3*0 mm.

5. iM tle ra lla m arblensis Thompson, specimen number UA 11, from the Black Princo Limestone north of Cascabel Road, Johnny Lyon Hills, Cochise County, Arizona. Axial and sagittal sections. Maximum diameter of sagittal section is 0.6 mm.

6. Plectogyra sp. Zeller, specimen number UA 12, from the Black Prince Limestone north of Cascabel Road, Johnny Lyon Hills, Cochise County, Arizona. Sagittal section. Maxi­ mum diameter is 0.4 mm. 52 3 fiound £ 7 7 7 / l j i > l

/ H

PLATE EC

BLACK PRINCE LIMESTONE

JOHNNY LYON HILLS SECTION

SWV4 , SW '/4 , NE '/4t Sec.16 , T. 14 S., R.2I E. 0 10 20 30 1------1______1______1 VERTICAL SCALE IN FEET

Profuaullnella coplosa Pro fuaulinella apodaceneis Plectogyra ep. ^oschybertella nexlcana

2 lO-i

Cover

200i

Conglomerate, limestone-pebble, dark-gray

Cover

Profuaulinella apodacensis Profusulinella coplosa Miller el 1.8 mmitlensle Psetriostaffella needhard TOP OF BLACK PRINCE LS.—167

Limestone, pink, fine-grained, dense, 2-1*1 beus

M illerella marblensle

Conglomerate, limestone-pebble, dark-gray pebbles

Millerella m arblensis ---- 120-

Limestone, pink, fine-grained, dense Millerella marblensis

PlectogjT? sp

uncoiled Plectogyra? Limestone, light-gray, fine-grained 80 limestone, liglrt-gray, fossiliferous, scattered black chert nodules Millerella marblensis

Chaetetes eximlua Limestone, medium-gray, medium-grained Michelinia scorpulosa Amplexocarinia corrugate Limestone, brownish-gray, fossiliferous Dibunophyllum ? inauditnm Pseudoza phrentoides n it ell us Limestone, light-gray, fine-grained C/> I C? O O I3CH

Millerella merblcrisis 120 i

limestone, pink, fine-grained, dense Millerella warblensls Flectogyra sp. > J_ T 1 M illerella marhlenaifi Flectogyra sp. } 1

90 J

mcoiled Flectogyra? Limestone, light-gray, fine-grained limestone, light-gray, fossiliferous, scattered black chert nodules Millerella warblensls

Chaetetes eximlua Limestone, medium-gray, medium-grained Michelinia scorpulosa Awplexocarinia corrugate Limestone, brovnish-gray, fossiliferous Dibmophyi Ivan ? inaudit urn Pseudozaphrcntoides n itellu s Limestone, light-gray, fine-grained Millerella warblensls Limestone, brownish-gray, crinoidal Millerella mrblensis Limestone, light-gray, fine-grained Flectogyra sp. Millere]la warblensls Millerella warblensls Limestone, crinoidal, light-gray

Limestone, light-gray, fine-grained, cherty

Millerella warblensls Cover

Flectogyra sp. Limestone, light-gray, fossiliferous

Millerella warblensls Conglomerate, limestone-pebble, dark-gray, granular, appears cross-bedded near top Millerella warblensls Mill erella zarblansis 1--- T Limestone, light-gray, dense, conglomeratic at base, appears oolitic

Shale, maroon

10 -

Limestone, maroon, granular, angular chert * 4 * Cover BASE OF BLACK PRINCE LS. — 0 Dolomite, dark-brown to black, tan weathering

> Geology by J.D. Nations, 1961

/ £ ~ , V V

/ f t /

PLATE 3ZI 174-

BLACK PRINCE LIMESTONE

GUNNISON HILLS SECTION SW 'A , Sec.4 , T. 16 S., R.23E. 0 10 20 30 i______' i i VERTICAL SCALE IN FEET

Profuaullnella apodacensia

250 Limestone, dark-gray, medium-grained, fossil iferous

240

230 \£&OXX&- Conglomerate, limestone-pebble, maroon matrix with white to pink pebbles

Profuaullnella apodacensia Chaetetes favoaus - 2 2 0 -; (measured on fault block south of measured section)

210 -

Cover

200 —

190 -i TOP OF BLACK PRINCE LS.— 189

180 -i Limestone, pink, fine-grained, dense

I 70 -

Conglomerate, limestone-pebble, pink pebbles, maroon matrix with greenish bands

160 4 Limestone, white to pink, fine-grained

Conglomerate, limestone-pebble, maroon matrix, pink I 50 - 1 « pebbles, greenish bands I limestone, white to pink, fine-grained I Conglomerate, limestone-pebble, maroon matrix, greenish bands 140 -■

Limestone, light-gray to pink, fine-grained

130 - Conglomerate, limestone-pebble, maroon matrix

Chaetetes sp.

Limestone, light-gray to pink, fine-grained, cherty I 20 -1 in middle

♦

I 10 -I Limestone, light-gray to pink, fine-grained

100 - Shale, dark-maroon, fossil iferous

J Limestone, pink, fine-grained, dense

9 0 ool o v OO O o d ooooio oo c? o oc Limestone, pink, conglomeratic, dark-gray at top 0 0 0 1 0 c> o r j Limestone, raedixan-gray, fine-grained, cherty Limestone, greenish, thin green wavy bands Limestone, pink, crinoidal Limestone, pink, conglomeratic

Limestone, pink to gray, crinoidal, cherty at top

Limestone, pink; and green shale, cherty at top Limestone, medium-gray, crinoidal, mottled, cherty at top Limestone, red, with thin shale partings, fossiliferous 60 - Conglomerate, limestone-pebble, d if f . compaction of shale

50 - Limestone, medium-gray, crinoidal

Shale, green to dark maroon, hard

Limestone, dark-gray, granular, mottled 40 -i

Limestone

Limestone, medium-gray, medium-grained, fossil!ferous 30 - Conglomerate, limestone-pebble, dark-gray

20 -J

Shale, maroon, with large chert nodules or pebbles

Lithostrotionells shimeri BASE OF BLACK PRINCE LS — 0

Lithostrotionella shimeri

10 Limestone, gray at bottom, pink at top, crinoidal

20 -

Limestone, dark-gray, fossiliferous 30 -

Dolomite, black on fracture, red-brown weathering

Geology by J.D. Nations, 1961 3 !)U fid /vZ— PLATE XC

BLACK PRINCE LIMESTONE

JOHNNY LYON HILLS SECTION SW A , SW /4, NE l/4, Sec.16 , T. 14 S., R.2I E.

O 10 20 30 l— ______I______L_ I VERTICAL SCALE IN FEET

Profuaullnella coplosa Profusultnelia apodaceneis Limestone, dark-gray, fossiliferous Plectogyra sp. Eoschiibertella nexlcana

Cover

2 0 0 -

Conglomerate, limestone-pebble, dark-gray

190-

Cover

Prof us vQ-inella spodacensis Prof na vilin el la copiosa MtiLlerella m rblensis 170- Pseudostaffella needhami TOP OF BLACK PRINCE LS.—167-

Limestone, pink, fine-grained, dense, 2-li* beds

Miller el la marblensis Plectogyra sp U 140-

Conglomerate, limestone-pebble, dark-gray pebbles 130-1

Millerella msrblensis

Limestone, pink, fine-grained, dense Millerella mrblensis Plectogyra sp

Millerella mrblensis Plectogyra sp.

90 -

uncoiled Plectogyra ? Limestone, light-gray, fine-grained Limestone, light-gray, fossiliferous, scattered black chert nodules Millerella mrblensis

Chaetetes exialus Limestone, medium-gray, medium-grained Michelinia scorpulosa Amplexocarinia corrugata Limestone, brownish-gray, fossiliferous Diburtophyllum ? inaudit urn Pseudozaphrentoides nltellus Limestone, light-gray, fine-grained Millerella mrblensis Limestone, brownish-gray, crinoidal Millerella mrblensis —-— Limestone, light-gray, fine-grained

Milleralla raarblensis Millerella marblensis Limestone

Limestone, light-gray, fine-grained, cherty

Millerella raarblensis Cover 40 -

Plectogyra sp Limestone, light-gray, fossiliferous

Millerella marblensis Conglomerate, limestone-pebble, dark-gray, granular, appears crass-bedded near top Millerella raarblensis Millerella marblensis appears oolitic

Limestone, maroon, granular, angular chert

Cover BASE OF BLACK PRINCE LS.— 0 Dolomite, dark-brown .to black, tan weathering £171/ / f t > / PLATE ZL ' 1 7 4

BLACK PRINCE LIMESTONE

GUNNISON HILLS SECTION SW 'A , Sec.4, T.I6 S.,R.23E. O 10 20 30 ■ ■ < i VERTICAL SCALE IN FEET

Profuaulinella apodacenela

250 Limestone, dark-gray, medium-grained, fossiliferous

240

230 m Conglomerate, 1iaestone-pebble, maroon matrix with white to pink pebbles

Profuaulinella apodacensla 1 Chaetetes favoaua J-220 (measured on fault block south of measured section)

210 -

Cover

200 '

190 • TOP OF BLACK PRINCE LS .— 189

180 - Limestone, pink, fine-grained, dense

170 - I 1 Conglomerate, limestone-pebble, pink pebbles, iroon matrix with greenish bands

1 6 0 - Limestone, white to pink, fine-grained

Conglomerate, lim estone-pebble, maroon itrix, pink siesd pebbles, greenish bands 1 5 0 - 1 1 Limestone, white to pink, fine-grained Conglomerate, limestone-pebble, maroon matrix, greenish bands 140 - 1 . Limestone, light-gray to pink, fine-grained

130 - Conglomerate, lim estone-pebble, maroon m atrix

Chaetetes sp.

Limestone, light-gray to pink, fine-grained, cherty I 20 - in middle

I 10 - Limestone, light-gray to pink, fine-grained

loo­ Shale, dark-maroon, fo ssil if eroxis

Limestone, pink, fine-grained, dense

se Hoolo o o o o c C U o CO ocoo oooc Limestone, pink, conglomeratic, dark-gray at top O O O C C> c o Limestone, mediua-gray, fine-grained, cherty g g g g g s ^ Limestone, greenish, thin green wavy bands Limestone, pink, crinoidal o? odi\o o OQo rt b < o£> no Limestone, pink, conglomeratic

Limestone, pink to gray, crinoidal, cherty at top 70 - Limestone, pink; and green shale, cherty at top Limestone, mediua-gray, crinoidal, mottled, cherty a t top Limestone, red, with thin shale partings, fossiliferous 6 0 - Conglomerate, limestone-pebble, diff. compaction of shale

Limestone, me dim-gray, crinoidal

Shale, green to dark maroon, hard

Limestone, dark-gray, granular, mottled 40 - O c o o\o<~> i Limestone, pink, fine-grained

Limestone, medium-gray, medium-grained, fos sill fero vis 30 -

(CTOl Conglomerate, limestone-pebble, dark-gray c, o ^ c>

20 -

Shale, maroon, with large chert nodules or pebbles

Lithostrotionella shimeri — BASE OF BLACK PRINCE LS — 0 =T Lithostrotionella shimeri

10 -

Limestone, gray at bottom, pink at top, crinoidal

20 —

Limestone, dark-gray, fossiliferous 3 0 -

/ / Dolomite, black on fracture, red-brown weathering

Geology by J.D. Nations, 1961