GEOLOGICAL SURVEY CIRCULAR 249

LITHOLOGIC CHARACTER OF THE 

ST. PETER SANDSTONE AND THE 

EVERTON FORMATION IN THE

BUFFALO RIVER VALLEY, 

NEWTON COUNTY, ARKANSAS
UNITED STATES DEPARTMENT OF THE INTERIOR 

Douglas McKay, Secretary

GEOLOGICAL SURVEY 

W. E. Wrather, Director

GEOLOGICAL SURVEY CIRCULAR 249

LITHOLOGIC CHARACTER OF THE ST. PETER SANDSTONE AND THE 

EVERTON FORMATION IN THE BUFFALO RIVER VALLEY 

NEWTON COUNTY, ARKANSAS

By Ernest E. Glick and Sherwood E. Prezon

Washington, D. C., 1953

Free on application to the Geological Survey, Washington 25, D. C.
	CONTENTS

Page Page

Introduction .............................. 1 Detailed sections of the St. Peter sandstone

Everton formation ........................ 4 and Everton formation along the

Beds below the Newton sandstone Buffalo River, Newton County,

member........................... 4 Ark. Continued

Newton sandstone member ............ 4 Section C ............................. 11

Beds between the Newton sandstone Section D ............................. 14

and Jasper members.............. . 6 Section E ............................. 16

Jasper member....................... 6 Section F ............................. 18

St. Peter sandstone ..................... . 6 Section G ............................... 21

Detailed sections of the St. Peter sandstone Section H .............................. 25

and Everton formation along the Buffalo Section I .............................. 32

River, Newton County, Ark. ............ 7 Section J ............................. 33

Section A............................. 7 Literature cited............................. 39

Section B ............................ 9

ILLUSTRATIONS

Page

Figure 1. Map showing location of sections of the St. Peter sandstone and Everton formation measured

along the Buffalo River, Newton County, Ark. ............................................. 2

2. Cross section showing the lithologic character of the St. Peter sandstone and

Everton formation along the Buffalo River, Newton County .................................. 3

iii
UTHOLOGIC CHARACTER OF THE ST. PETER SANDSTONE AND THE 

EVERTON FORMATION IN THE BUFFALO RIVER VALLEY 

NEWTON COUNTY, ARKANSAS

By Ernest E. Click and Sherwood E. Frezon

INTRODUCTION

Since 1949, the U. S. Geological Survey, with 

the informal cooperation of the Division of Geology, 

Arkansas Resources and Development Commission, 

has been engaged in stratigraphic investigations in 

northern Arkansas to aid in the search for oil and gas 

in the Arkansas Valley. These investigations include 

surface and subsurface studies, some of which have 

been completed and published (Lantz, 1950; Maher 

and Lantz, 1952, 1953). i Work currently in progress 

includes the preparation of subsurface cross sections 

of the pre-Atoka rocks in the Arkansas valley, and 

areal mapping in the Mount Judea and Snowball 

quadrangles of Searcy and Newton Counties. This 

report presents and discusses the detailed stratigraphic sections used in correlating and mapping 

the St. Peter sandstone and Everton formation in the 

Mount Judea and Snowball quadrangles,.

The detailed descriptions of surface sections in 

this report are based on rock samples collected in 

the Buffalo River valley in Newton County, Ark., at 

the localities shown in figure 1. The sections were 

measured in the field by tape and hand level; all units 

were measured perpendicular to the bedding. Field 

descriptions were made with special emphasis on 

bedding and weathering, and representative samples 

were taken of each lithologic unit for laboratory 

examination and lithologic description. The samples 

were crushed, washed, and examined in the office 

with a binocular microscope. -Field and laboratory 

data were then combined into the detailed sections 

included in this report.

The terminology used in the descriptions of the samples is essentially that used by most geologists in the midcontinent region, making microscopic examinations of 

well samples. A limestone or dolomite is called "crystalline" 

if the texture is rough and crystal faces can be seen, 

"granular" if the texture is rough and crystal faces cannot be seen, and "dense "if the texture is smooth. A 

carbonate rock that leaves a large residue of silt after 

digestion in acid is called "silty"; one containing indeterminate, round or ovate, particles about the size of oolites 

is termed "oolitoid. " Sandstone with siliceous cement 

is called "quartzitic " if it breaks across the sand grains. 

The terms given below are used in accordance with the 

Wentworth Grade Scale:

Silt, 0.0039 to 0.062 mm in diameter. 

Very fine grained sandstone, 0.062 to 0.125 mm 

in diameter.

1 See page 39 for literature cited.

Fine-grained sandstone, 0.125 to

0. 25 mm in diameter. 

Medium-grained sandstone, 0. 25

to 0. 50 mm in diameter. 

Coarse-grained sandstone, 0. 50

to I. 00 mm in diameter. 

Very coarse grained sandstone,

1. 00 to 2. 00 mm in diameter.

Because the sand in the carbonate rocks 

and the sandstones is composed dominantly of 

frosted subrounded to rounded quartz grains, these 

characteristics are not included in the detailed 

descriptions. The approximate size of the sand 

grains is given for the sandstones but not for the 

carbonate rocks. In general, both fine- and mediumsized grains are present in the sandy carbonate rocks.

The bedding is described as follows:

Fissile, less than 1/16 inch thick. 

Platy, 1/16 to 1/2 inch thick. 

Very thin bedded, 1/2 to 2 inches 'thick. 

Thin-bedded, 2 to 4 inches thick. 

Medium-bedded, 4 to 12 inches thick. 

Thick-bedded, 12,to 36 inches thick. 

Massive, more than 36 inches thick.

The term "cryptozoon structure" refers to any 

structure which suggests that a unit is in part algal 

in origin. This includes a distinctive type of wavy 

banding in limestone and dolomite beds as well as 

preserved colonies of calcareous algae in limestone 

beds. In the past these algal colonies have been 

referred to Cryptozoon sp.

The National Research Council rock-color chart 

was used for color names in the descriptions. Colors 

obviously due to weathering were not described.

Colored log strips on the scale of 10 feet to the 

inch were prepared from the detailed lithologic 

descriptions of this report. A detailed cross section 

was constructed from information on these log strips 

and was generalized in the form of figure 2. This 

figure shows the lithologic character of the St. Peter 

sandstone and members of the Everton formation in 

ten sections along the Buffalo River designated A 

to_Jin figure 1. The datum used in alining these 

sections is the top of the basal sandstone 

of the Jasper member of the Everton formation 

except in section A, where this unit is absent. 

Section A is alined on the top of the Newton sandstone 

member.
R.2IW. R.20W. 93" OO1 R.I9W. 

Line of cross section 

shown in figure 2

R.2IW. R.20W. 93-001 R.|9 W. 

Figure 1. Map showing location of sections of the St. Peter sandstone and Everton formation measured along the Buffal
FERNVALE

LIMESTONE

(ORDOVICIAN)

Limestone and thin sandstone beds 

Sandstone and thin limestone beds

Member boundary 

Facies boundary

50-

3 Miles

Datum is top of basal sandstone of the Josper 

member of the Everton formation in sections 

B to J. Section A is alined on the top of the 

Newton sandstone member of the Everton formation . Letters above sections refer to locations in figure I

Figure 2. Cross section showing the lithologic character of the St. Peter sandstone and Everton formation along the Bu
The authors wish to thank H. D. Miser, of the 

U. S. Geological Survey, for giving generously of 

his time and experience in discussing some of the 

problems encountered, and N. F. Williams, 

director, Division of Geology, Arkansas Resources 

and Development Commission, who provided base 

maps and extended many courtesies. Section E of this 

report is a part of a previously published section at 

Carver, Ark. (Maher and Lantz, 1952, p. 10-12).

EVERTON FORMATION (MIDDLE ORDOVICIAN)

A Middle Ordovician sequence of limestone, 

sandstone, and dolomite beds,about 405 feet thick, 

separates the Powell dolomite (Lower Ordovician) and 

the St. Peter sandstone (Middle Ordovician) near 

Mount Hersey in the Yellville quadrangle (section _J, 

figs. 1 and 2).. McKnight (1935,. pi. 3) mapped this 

sequence as the Everton formation and noted that the 

upper limestone beds are lithologically identical with 

the Jasper limestone mapped in the adjacent Harrison 

quadrangle by Purdue and Miser (1916, p. 8) as a separate 

formation. He also suggested that detailed stratigraphic 

work in the Buffalo River valley south of the Harrison 

and Yellville quadrangles would show that the 

Jasper limestone should be considered as a member 

of the'Everton. The writers, who have assisted in the 

mapping of the Buffalo River valley immediately south 

of the Harrison and Yellville quadrangles (fig. 1), find 

that the Jasper limestone can be traced into the upper 

part of the Everton formation as suggested by 

McKnight. They also believe that, although the 

Jasper limestone is a mappable unit in the 

Harrison quadrangle, it is not a mappable unit farther 

east because the base becomes indistinct owing to 

gradation into underlying beds, and the upper limestones 

that typify the unit at Jasper grade laterally into 

dolomite beds (fig. 2). Therefore the Jasper limestone 

is treated in £his report as the Jasper member of the 

Everton formation. The'chart on page 5 shows the 

classification used in this report and the changes in 

names and correlations that have been made in the 

last four decades.

The Everton formation is widely distributed over' 

northern Arkansas and is well exposed in the cliffs 

along the Buffalo River in northern Newton and 

^Searcy Counties. The name is taken from'the town 

of Everton in the Yellville quadrangle (Ulrich, 1911, 

pi. 27), where only part of the formation is exposed. 

The most complete exposure in the area of this 

investigation is at the locality of section J. (See fig. 1). 

There the formation is about 405 feet thick and is 

composed of four lithologic units. In ascending order 

these units are (1) a sequence of dolomite and sandstone, 

245 feet exposed, base covered, (2) the Newton Sandstone 

member, 8 feet thick, (3) a sequence of dolomite and 

sandstone, 90 feet thick, and (4) the Jasper member, 

55 feet thick. The upper part of the Powell dolomite 

and the lower 10 feet or less of the Everton formation 

are covered at this locality; the contact of the two 

formations, which according to McKnight (1935, p. 40) 

is unconformable, is about 55 feet above river level. 

The base of the Everton formation is below river level 

at the localities of the other sections described in 

this report.

The Everton formation is unconformably overlain 

by the St. Peter sandstone and the basal sandstone

member of the Boone formation along the line of these 

sections. The -St. Peter sandstone overlies the 

Jasper member of the Everton formation in sections D 

through J. At each of these localities the St. Peter 

rests upon an irregular wavy surface. This irregularity 

is most striking in section J where 4 feet of relief is 

present on the top of the limestone beds in a lateral 

distance of 25 feet. The basal sandstone member of 

the Boone formation overlies the Everton formation 

in sections A, B, and C. It rests on beds older than 

Jasper in section A , on a nearly complete thickness 

of Jasper in section B , and on a thin remnant of 

Jasper in section C.~ These irregularities are 

attributable mostly to truncation of local structures 

before deposition of the Boone formation.

Beds below the Newton sandstone member

Beds of the Everton formation below the 

Newton sandstone member are partially exposed in 

sections A , C , F , G, H, and J. The exposure of 

this sequence in section J is 245~feet thick. These 

beds exhibit a limy facies in section A which grades 

eastward into a dolomitic facies in section G to J . 

(See fig. 2.) The limy facies consists of light olivegray oolitic ostracodal dense limestone interbedded 

with limy sandstone; the dolomitic facies is composed 

of brownish-gray finely to medium-crystalline dolomite 

interbedded with dolomitic sandstone. The limy facies 

locally contains preserved algal colonies; both facies 

locally exhibit wavy banded beds which are probably 

algal in origin. A loosely coiled cephalopod(?) and 

what seem to be molds of small pelecypod valves 

were found in the lower part of the limy facies of 

section G. In general fossils are poorly preserved 

in the dolomitic facies. The Kings River sandstone 

member and the Sneeds limestone lentil, which compose 

the lower part of the Everton formation in the 

Harrison quadrangle (Purdue and-Miser, 1916, p. 5), 

are not identifiable in section J, a nearly complete 

exposure of this sequence.

Newton sandstone member

The Newton sandstone member of the Everton 

formation was named by McKnight (1935, p. 39) for 

its prominence in northern Newton County, Ark. 

Previously this sandstone had been mapped as the 

St. Peter sandstone in the Eureka Springs and 

Harrison quadrangles by Purdue and Miser (1916, p. 7). 

According to Purdue and Miser, the sandstone thins 

eastward from 15O feet in northwestern Newton County 

to 15 feet in northeastern Newton County. This eastward 

thinning is also present in the Buffalo River valley 

( fig. 2) where the Newton sandstone member thins 

from about 65 feet in section A to about 8 feet in 

section J . Much of this thinning seems to be the 

result oFthe basal beds of the sandstone grading 

laterally into limestone and dolomite beds.

The massive Newton sandstone member forms 

a prominent cliff along the Buffalo River in central 

Newton County; however, in the eastern half of the 

area of this study, it is thjn and hardly distinguishable 

from other sandstones of the Everton formation. It 

is composed primarily of rounded and frosted fine 

to medium sand grains bound by a small amount of 

limy cement. The only fossiliferous bed found in the
Names and equivalents of Middle and Lower Ordovician rocks in Newton County, Ark.

Present report

(Circ. 249)

St. Peter sandstone.

o

1

"^&

0

t:

0)

w

 Jasper member.

Dolomite and

sandstone.

Newton sandstone

member.

Limestone, dolomite, 

and sandstone.

Powell dolomite.

McKnight, E. T. , 1935,

Zinc and lead deposits

of northern Arkansas:

U. S. Geol. Survey 

Bull. 853.

St. Peter sandstone.

2

Jasper limestone.

c

-I-Ho

±j

g

^

o

3

w

Newton sandstone

member.

Powell dolomite.

Purdue, A. H. , and Miser,

H. D. , 1916, U. S. Geol.

Survey Geol. Atlas,

Eureka Springs-Harrison 

folio (no. 202).

(Generally absent).1

Jasper limestone.

3

Joachim limestone.

St. Peter sandstone.3

formation

S

2

Kings River 

sandstone member.

Sneeds limestone

lentil.

Powell limestone.

1 Section D of the present report indicates that a thin remnant 

of true St. Peter sandstone is present locally in theHarrison quadrangle.

2 McKnight (1935, table racing p. 16) states: "Future work may 

show that the Jasper limestone should be classed as s part of the 

Everton formation."

3 McKnight, (1935, table facing p. 16) states: "The so-called 

'Joachim limestone' and so-called 'St. Peter sandstone' of the 

Eureka Springs and Harris on quadrangles are equivalent to the upper 

portion of the Everton formation of the Yellville quadrangle."
member is a thin ostracodal limestone in the middle 

of the unit in section A .

Beds between the Newton sandstone 

and Jasper members

A sequence of dolomite, sandy dolomite, and 

dolomitic sandstone beds, about 90 feet thick, conformably overlies the Newton sandstone member. 

This dolomitic sequence becomes increasingly 

sandy toward the top and grades, into the limy basal 

sandstone of the Jasper member. The contact 

with the overlying Jasper member, which is drawn 

arbitrarily at the top of the dolomitic beds, does not 

follow bedding planes. The character of the entire 

unit changes little within the area although individual 

beds do not remain distinctive when traced laterally. 

A few poorly preserved ostracods were found.

Jasper member

The Jasper member is composed of two major 

lithologic units, a basal limy sandstone unit and an 

overlying sandy limestone or sandy dolomite unit. 

The contact between the two units is so clearly defined by a sharp lithologic cha'nge from a sandstone-to 

a massive limestone and dolomite bed that this 

horizon has been used as a datum for the cross section 

of figure 2.

In section B, the basal sandstone of the Jasper 

member is 14 feet thick and composed entirely of 

friable limy sandstone beds; in section D, the basal 

sandstone of the Jasper is 35 feet thick and includes 

five thin ostracodal limestone beds. Eastward from 

section D , the lower part of the basal sandstone of 

the Jasper grades into the underlying dolomitic beds. 

The basal sandstone is represented in section J by 

only 11 feet of limy sandstone and thin limestone beds.

Purdue and Miser (1916, p. 8) described the 

upper unit of the Jasper as a dense limestone "interbedded with a subordinate though considerable amount 

of sandstone." Much of the limestone is oolitic 

and some of it is sandy. Eastward from the 

type area, this limy facies (sections B and D) 

grades into a dolomitic facies (sections E, ~" 

F , G, H, and J_) and back into a limy facies 

(section J). Because individual sandstone beds 

of the Jasper can be correlated throughout this 

area, it is evident that "the limy and the dolomitic 

facies are parts of the same unit.

The Jasper member is the most fossiliferous 

part of the Everton formation. Ostracods are 

abundant in most of the limestone beds, and 

cephalopoda, gastropods, pelecypods, trilobites, 

worm borings, and fossil algae have been found 

in certain localities. Fossils in the dolomite 

beds of the Jasper are generally few and 

poorly preserved.

ST. PETER SANDSTONE

Adams and Ulrich (1905, p. 3) introduced the 

name St. Peter sandstone, first used by Owen (1847, 

p. 169) in Minnesota, into the geologic literature of

the Ozark region. In mapping the Eureka Springs 

and Harrison quadrangles, Purdue and Miser 

(1916, p. 7) applied the name to a massive 

sandstone which was thought to be correlative 

with the St. Peter of the Yellville district 

to the east. Croneis (1930) and Giles (1930) 

followed the correlations of Purdue and Miser 

in this area. Later McKnight (1935, p. 39) 

showed that the massive sandstone mapped by 

Purdue and Miser in the Eureka Springs and 

Harrison quadrangles is not correlative with 

the St. Peter of the Yellville quadrangle but 

is a member (Newton sandstone) of the 

Everton formation. (See chart.)

The St. Peter sandstone is exposed in 

the valley of the Buffalo River in northeastern 

Newton and northern Searcy Counties, Ark. 

It is present in sections D to J of this report, 

ranging in thickness from a fraction of a foot 

to 73 feet (section H). The St. Peter sandstone appears to rest unconformably on the 

Everton formation. No angular discordance 

between the formations was noted, but the 

contact is undulating the lowermost sand beds 

of the St. Peter dip into the depressions 

and lap over the higher parts of the uneven 

surface of the Everton. The St. Peter is 

unconformably overlain by the Plattin limestone. 

Where the 'Plattin limestone has been cut out, 

the Boone formation overlies the St. Peter 

with evident angular unconformity. This angular 

unconformity is best seen in the area of 

section D.

The St. Peter sandstone is so poorly 

exposed in the Buffalo River valley that no 

complete section could be obtained. The 

maximum thickness of the St. Peter in the 

area investigated is 73 feet in section H, 

but a considerable part of this thickness could 

not be sampled or described.

The base of the formation in section H is 

a fine- to medium-grained sandstone bed, 6 feet 

9 inches thick, containing thin quartzitic layers. 

The sand grains are partly rounded and frosted 

and partly angular as a result of secondary 

quartz growth. Topographically, this basal 

unit forms a low bench in all the sections 

from D to £ . Above the basal sandstone of 

section H lies a covered interval, 58 feet 

thick, which has its counterpart in sections E, 

F , G , and J . Scattered exposures in sections E , 

F , and G Indicate that the interval consists 

of a sequence of soft dolomitic or limy silty sandstone and silty sandy dolomite beds. Ostracod 

molds were found in this unit in sections E 

and F. A bed of sandstone about 8 feet tEick 

is present above the covered interval in 

section H, but apparently it is not present 

in any of the other sections. This bed is 

similar in lithology and outcrop to the lower 

sandstone of the formation. The presence of 

upper and lower sandstone units separated by a thick 

covered interval suggests that the three lithologic 

units in the St. Peter noted by McKnight (1935, 

p. 43) in the Yellville quadrangle may be present 

in section H.
DETAILED SECTIONS OF THE ST. PETER SANDSTONE AND EVERTON FORMATION ALONG THE BUFFALO

RIVER, NEWTON COUNTY, ARK.

A. Section of the Everton formation, 200 yards

upstream from the north end of the Buffalo River 

bridge on State Route 7 in the NWiNEi sec. 7, 

T. 16 N., R., 20 W., Newton County, Ark. Base 

of section at river level.

Carboniferous (Mississippian) rocks: 

Boone formation:

St. Joe limestone member. 

Basal sandstone member.

Ft in_ 

Ordovician rocks:

Everton formation:

Dolomite, medium-bedded,

brownish-gray, sandy, very

finely granular;

contains some dolomite

stringers without sand;

ostracods in the lower

3 inches.................... 5 0

Sandstone, medium-bedded,

brownish-gray, dolomitic

fine- to medium-grained;

contains thin stringers of

dolomite ................... 5 0

Sandstone, medium-bedded,

brownish-gray, dolomitic,

slightly limy, fine- to mediumgrained; contains white coarse

calcite crystals ............ 3 5

Dolomite, medium -

bedded, light brownishgray to brownish-gray,

sandy, very finely

granular ................... 2 4

Sandstone, mediumbedded, yellowish-gray,

dolomitic, fine- to

medium-grained; grains

exhibit secondary growth;

contains stringers of

brownish-gray dolomite

1 to 2 inches

thick....................... 5 10

Dolomite, medium-bedded,

brownish-gray, finely

crystalline ................. 6

Sandstone, thin-bedded,

yellowish-gray, slightly

limy, poorly sorted,

fine- to coarsegrained ................... 6

Dolomite, medium-bedded,

brownish-gray, sandy, finely

crystalline; ostracods ....... 3 2

Dolomite, medium-bedded,

yellowish-gray, sandy,

slightly limy, finely

crystalline................. 2 7

Dolomite, medium-bedded,

light brownish-gray to olivegray, slightly limy, dense;

contains scattered sand

grains..................... 8

Dolomite, medium-bedded,

light brownish-gray, sandy,

slightly limy, very finely

granular to finely

crystalline ................ 10

Ft in_ 

Ordovician rocks Continued

Everton formation Continued

Dolomite, medium-bedded, 

light brownish-gray, finely 

crystalline; contains small 

dolomite pebbles in upper 

2 inches,and scattered sand 

grains throughout........... 2 2

Sandstone, medium-bedded, 

light brownish-gray, very 

dolomitic, very fine to 

medium-grained............ 1 8 '

Dolomite, medium-bedded, 

dark-gray, very finely 

granular; contains scattered 

sand grains and a few white 

coarse dolomite 

crystals.................... 3 0

Dolomite, medium-bedded, 

light olive-gray to darkgray, slightly limy, very 

finely granular; contains thin 

yellowish-gray sandstone dikes 

(mud-crack fillings?) in the 

upper beds.................. 5 0

Dolomite, medium-bedded, 

medium light-gray, very 

finely granular; contains 

scattered sand grains ....... 1 0

Sandstone, medium-bedded, 

yellowish-gray, limy, 

medium-grained; contains 

stringers of light olive-gray 

dolomitic sandstone......... 1 0

Sandstone, medium-bedded, 

white to yellowish-gray, 

slightly limy, mediumgrained; grains exhibit secondary growth ................ 3 5

Dolomite, thin- to mediumbedded, dark-gray, very 

finely granular; contains 

scattered sand grains....... 10

Sandstone, medium-bedded, 

yellowish-gray, limy, fineto medium-grained ......... 5

Dolomite, medium-bedded, 

light olive-gray, finely 

crystalline; contains some 

white coarse calcite 

crystals ................... 3 6

Sandstone, medium-bedded, 

yellowish-gray to light 

brownish-gray, very dolomitic, fine- to mediumgrained; contains white 

limy sandstone stringers .... 1 6

Sandstone, medium-bedded, 

light brownish-gray, very 

dolomitic, fine- to mediumgrained ................... 2 7

Dolomite, medium-bedded,

light olive-gray, finely crystalline ....................... 6

Sandstone, thin-bedded, light 

brownish-gray, very dolomitic, fine-to mediumgrained ................... 3
Ordovician rocks Continued

Everton formation Continued 

Newton sandstone member:

Sandstone, thin- to medium - 

bedded, yellowish-gray, 

slightly limy, fine- to 

medium-grained...........

Sandstone, crossbedded, 

thin- to mediumrbedded, 

yellowish-gray, fine- to 

medium-grained ......... .

Sandstone, crossbedded, 

thin- to medium-bedded, 

yellowish-gray, poorly 

sorted, very fine to 

medium-grained...........

Sandstone, crossbedded, 

thin- to medium-bedded, 

yellowish-gray, fine- to 

medium-grained ...........

Sandstone, medium-bedded, 

yellowish-gray, very fine 

to medium-grained; grains 

exhibit secondary 

growth....................

Sandstone, thin- to mediumbedded, yellowish-gray, 

limy, fine- to mediumgrained; grains exhibit 

secondary growth ..........

Limestone, thin-bedded,

light olive-gray, sandy, very

finely granular;

ostracods.................

Limestone, medium-bedded, 

light olive-gray, oolitic, very 

finely granular; 

ostracods ................

Sandstone, medium-bedded, 

yellowish-gray, very limy, 

fine- to medium-grained; 

grains exhibit secondary 

growth ...................

Sandstone, medium-bedded, 

yellowish-gray, limy, fineto medium-grained; grains 

exhibit much secondary 

growth ...................

Sandstone, medium-bedded, 

yellowish-gray, fine- to 

medium-grained; grains 

exhibit secondary 

growth ..................

Sandstone, medium-bedded, 

yellowish-gray, limy, fineto medium-grained ....... .

Sandstone, medium-bedded, 

yellowish-gray, fine- to 

medium-grained; grains 

exhibit secondary 

growth.................. .

Sandstone, thin- to mediumbedded, yellowish-gray, 

slightly limy, fine- to 

medium-grained; grains 

exhibit secondary 

growth.................. .

Ft in_ £t, i2. 

Ordovician rocks Continued

Everton formation Continued

Newton sandstone member Con. 

Sandstone, thin- to 

medium-bedded, 

yellowish-gray to 

3 10 white, limy, fine- to

medium-grained; grains

exhibit secondary

growth ................ 5 0

5 0 (Base of Newton sandstone member) 

Limestone, very thin to thinbedded, light olive-gray, 

very finely crystalline; 

contains scattered sand 

5 0 grains ................ 10

Sandstone, thin- to mediumbedded, yellowish-gray, 

limy, fine- to medium5 0 grained; grains exhibit secondary growth ......... 5 8

Limestone, medium-bedded, 

light olive-gray, oolitoid, 

dense to finely crystalline;

5 0 contains scattered sand grains

and white, medium to coarse 

calcite crystals ........ 1 8

Limestone, thin-bedded,

light olive-gray, very sandy, 

5 0 - finely crystalline ....... 4

Limestone, medium-bedded, 

light olive-gray, finely to 

medium-crystalline; con2 tains scattered sand grains,

dense limestone granules, and 

cryptozoon structures... 9 

Sandstone, thin- to medium10 bedded, yellowish-gray, 

limy, fine- to mediumgrained................ 2 9

Sandstone, thin- to mediumbedded, yellowish-gray,

2 0 limy, fine- to mediumgrained; thin limestone 

stringers in lower one-third 

of unit ................. 2 6

Limestone^ thick-bedded, 

2 3 light olive-gray, oolitic,

dense to very finely granular; 

contains scattered sand grains, 

limestone granules, and some 

white medium-crystalline cal5 0 cite; ostracods ........ 1 9

Limestone, very thin to thinbedded, yellowish-gray, 

5 0 sandy, very finely

granular............... 1 3

Sandstone, thick-bedded, 

yellowish-gray, slightly 

limy, fine- to medium - 

5 0 grained; grains exhibit much

secondary growth....... 5 8

Sandstone, thick-bedded, 

yellowish-gray, limy, 

very fine to medium-grained; 

grains exhibit much secondary 

!0 0 growth ................... 4 3
Ft in Ft in

Ordovician rocks Continued

Everton formation Continued

Limestone, medium-bedded, 

light olive-gray, oolitoid, 

dense to finely crystalline; 

contains scattered sand 

grains ...................

Sandstone, medium- to thickbedded, yellowish-gray, 

limy, very fine to mediumgrained; grains exhibit 

secondary growth ..........

Limestone, very thin to 

medium-bedded, light 

olive-gray, oolitic, dense; 

contains scattered sand 

grains ...................

Limestone, very thin to mediumbedded, light olive-gray, 

oolitic, dense to finely crystalline; contains thin sandstone 

stringers................ .

Limestone, medium-bedded, 

light olive-gray, oolitic, 

dense; contains scattered 

sand grains...............

Sandstone, thin- to mediumbedded, yellowish-gray, 

very limy, fine- to 

medium-grained ..........

Limestone, thin-bedded,

light olive-gray, oolitic, very 

finely granular; contains 

scattered sand grains..... .

Sandstone, medium-bedded, 

yellowish-gray to white, limy, 

fine- to medium-grained; 

contains olive-gray, dense, 

limestone granules in the 

lower 1 inch............. .

Limestone, medium-bedded, 

light olive-gray, oolitic, 

dense to finely crystalline; 

contains scattered sand 

grains .................. .

Limestone, very thin to thinbedded, light olive-gray, 

oolitic, dense to very finely 

granular; contains some 

white coarse calcite 

crystals ..................

Limestone, thin- to mediumbedded, light olive-gray, 

dense to finely crystalline; 

contains scattered sand 

grains ...................

Limestone, thin-bedded, light 

olive-gray, sandy, finely 

crystalline................

Limestone, mediumbedded, yellowishgray, very sandy, 

finely crystalline .........

Limestone, thin-bedded, 

light olive-gray, 

oolitic, dense; contains scattered sand 

grains .................. .

1 6

Ordovician rocks Continued

Everton formation Continued

Limestone, medium-bedded, 

light olive-gray, oolitic, 

dense; contains scattered 

sand grains and thin sandstone stringers............

Sandstone, medium-bedded, 

yellowish-gray to white, 

very limy, fine- to mediumgrained; contains some 

white coarse calcite 

crystals ..................

Limestone, platy to very 

thin bedded, light olivegray, oolitic, dense; contains scattered sand grains; 

grades into sandstone above 

and below .............

Sandstone, thin- to mediumbedded, yellowish-gray, 

limy, fine- to mediumgrained................

Limestone, thin-bedded, 

light olive-gray, sandy, 

finely crystalline........

Limestone, medium-bedded, 

light olive-gray, oolitic, 

dense; contains scattered 

sand grains and thin sandstone stringers........ .

Limestone, medium-bedded, 

light olive-gray, oolitic, 

dense; contains scattered 

sand grains........... .

Sandstone, medium-bedded, 

yellowish-gray, limy, fineto medium-grained .....

Limestone, very thin to 

thin-bedded, light olivegray, oolitoid, dense to 

finely crystalline; contains scattered sand 

grains .................

Limestone, medium-bedded, 

yellowish-gray, sandy, 

finely crystalline; contains 

some flattened limestone 

granules ...............

Limestone, thin-bedded, 

light olive-gray, oolitic, 

dense; contains scattered sand grains ...... .

Base of section at river level.

5 0

186 7

B. Section of the Everton formation on the south side 

of the Buffalo River, 50 yards upstream from 

the mouth of Mill Creek in the NEi sec. 7, 

T. 16 N,, R. 20 W., Newton County, Ark. 

Base of section at river level.

Carboniferous (Mississippian) rocks: 

Boone formation:

St. Joe limestone member. 

Basal sandstone member.
Ft in

Ordovician rocks:

Ever ton formation: 

Jasper member:

Limestone, mediumbedded, light olive - 

gray, slightly oolitic, 

dense; contains pyrite, 

especially in the upper 

6 inches ................ .

Limestone, thin-bedded, 

light olive-gray to brownishgray, sandy, oolitic, dense 

to finely crystalline; contains 

pyrite .................. .

Sandstone, thin-bedded, light 

olive-gray, limy, mediumgrained. ..................

Sandstone, medium-bedded, 

yellowish-gray to light 

olive-gray, very limy, fineto medium-grained; contains 

limestone granules; 

ostracods ............... .

Limestone, mediumbedded, light olive-gray, 

oolitic, dense; contains 

white medium-sized calcite 

crystals; ostracods ...... .

Sandstone, medium-bedded, 

yellowish-gray, limy, 

fine-grained ............ .

Limestone, thin-bedded, 

light olive-gray, oolitic, 

dense................... .

Sandstone, medium-bedded, 

yellowish-gray, very 

limy, fine-grained ....... .

Limestone, medium-bedded, 

light olive-gray, oolitic, 

dense to finely crystalline; 

ostracods ............... .

Limestone, medium-bedded, 

light olive-gray, oolitic, 

dense to very finely granular; ostracods .......... .

Limestone, medium-bedded, 

light olive-gray, oolitic, 

dense to very finely 

granular ................ .

Limestone, medium-bedded, 

light olive-gray to light 

brownish-gray, oolitoid, 

very finely granular to 

finely crystalline; contains 

scattered sand grains..... .

Sandstone, medium-bedded, 

yellowish-gray, slightly 

limy, fine-grained; grains 

exhibit much secondary 

growth.................. .

Sandstone, medium-bedded, 

yellowish-gray, slightly 

limy, fine-grained; grains 

exhibit much secondary 

growth ................. .

Sandstone, medium-bedded, 

yellowish-gray, limy, 

fine- to medium-grained; 

grains exhibit secondary 

growth ................. .

(Base of Jasper member)

1 7

4

4

1 3

1 0

	2

4 2

4 0

4 3

5 0

5 0

4 0

5 0

5 0

Ordovician rocks Continued

Everton formation Continued

Dolomite, mediumbedded, brownishgray, finely crystalline; 

contains scattered sand 

grains.................

Dolomite, thin-bedded, 

brownish-gray, sandy, 

finely crystalline ...... .

Sandstone, medium-bedded, 

yellowish-gray to white, 

limy, slightly dolomitic, 

fine- to medium-grained; 

grains exhibit secondary 

growth ............... .

Dolomite, medium-bedded, 

light olive-gray, very 

sandy, finely 

crystalline ........... .

Sandstone, medium-bedded, 

yellowish-gray to white, 

slightly limy, fine- to 

medium-grained; grains 

exhibit much secondary 

growth ............... .

Sandstone, medium-bedded, 

yellowish-gray to white, 

slightly dolomitic, slightly 

limy, fine- to mediumgrained .............. .

Sandstone, medium-bedded, 

light olive-gray, very 

dolomitic, fine- to 

medium-grained ...... .

Sandstone, medium-bedded, 

light olive-gray to white, 

dolomitic, slightly limy, 

fine- to medium-grained; 

contains thin stringers of 

limy sandstone and dolomite 

with scattered sand 

grains ....'........... .

Dolomite, medium-bedded, 

brownish-gray, finely 

crystalline; contains scattered sand grains'.......

Sandstone, medium-bedded, 

yellowish-gray, Urny, 

dolomitic, fine- to medium - 

grained................

Sandstone, medium-bedded, 

yellowish-gray, fine- ts 

medium-grained; grains 

exhibit secondary 

growth................

Dolomite, medium-bedded, 

brownish-gray, finely 

crystalline ............

Sandstone, medium- to 

thick-bedded, yellowishgray to light olive-gray, 

very dolomitic, fine- to 

medium-grained........

Dolomite, medium-bedded, 

medium dark gray, dense; 

contains scattered sand 

grains ................

Base of section at river level

Ft in

1 4

3

1 1

3 10

1 3

3 11

3 0

10

3 10

6 0

74 4
C. Section of the Everton formation on the north side 

of the Little Buffalo River 50 yards upstream 

from the junction with Buffalo River in the 

NEiNWi sec. 21, T. 16 N., R. 20 W., Newton 

County, Ark. Base of section at river level.

Carboniferous (Mississippian) rocks: 

Boone formation:

St. Joe limestone member. 

Basal sandstone member.

Ft in

Ordovician rocks:

Everton formation: 

Jasper member:

Sandstone, medium-bedded, 

yellowish-gray, slightly 

limy, fine- to medium - 

grained; grains exhibit 

secondary growth..........

Sandstone, thin-bedded, 

yellowish-gray, very limy, 

fine- to medium-grained; 

grains exhibit some secondary 

growth ...................

Sandstone, medium-bedded, 

very light-gray to yellowishgray, very limy, fine- to 

medium-grained; contains 

thin stringers of sandy 

limestone.................

Limestone, medium-bedded, 

light olive-gray, oolitic, 

dense to finely crystalline; 

contains scattered sand grains; 

ostracods ................

Limestone, medium-beaded, 

medium-gray to light olivegray, sandy, finely 

crystalline................

Sandstone, medium-bedded, 

yellowish-gray to white, 

limy, fine- to mediumgrained; grains exhibit 

secondary growth..........

Limestone, thin- to mediumbedded, gray to brownishgray, oolitic, dense to finely 

crystalline; ostracods ......

Sandstone, medium- to thickbedded, yellowish-gray to 

white, slightly limy, fineto medium-grained; grains 

exhibit secondary 

growth ...................

(Base of Jasper member)

Sandstone, medium-bedded, 

light brownish-gray; very 

dolomitic, fine- to mediumgrained ................. .

Sandstone, medium-bedded, 

light brownish-gray, 

dolomitic, mediumgrained ...................

Dolomite, medium-bedded, 

light olive-gray, finely 

crystalline; contains scattered sand grains and white 

very coarse calcite 

crystals ..................

2 6

Ft. in 

Ordovician rocks Continued

Everton formation Continued

Dolomite, mediumbedded, yellowish-gray 

to light brownish-gray, 

very sandy, finely to medium - 

crystalline; contains white 

medium to very coarse calcite 

crystals; grades into overlying 

unit................... 5 0

Sandstone, medium-bedded, 

yellowish-gray to white, 

dolomitic, slightly limy, 

fine- to medium-grained; 

grains exhibit secondary 

growth................. 3 1

Dolomite, medium-bedded, 

light brownish-gray, very 

sandy, dense to finely 

crystalline ............. 1 10

Sandstone, medium-bedded, 

very light gray to light 

brownish-gray, limy, 

medium-grained; grains 

exhibit secondary 

growth ................ 1 1

Sandstone, medium- to thickbedded, light brownish-gray, 

very dolomitic, fine- to 

medium-grained ....... 5 5

Dolomite, thick-bedded, 

brownish-gray and medium 

dark gray, dense to finely 

crystalline; contains scattered sand grains; 

ostracods.............. 2 1

Sandstone, medium-bedded, 

light brownish-gray to 

brownish-gray, dolomitic, 

medium-grained ....... 3 6

Sandstone, medium-bedded, 

light brownish-gray to 

light olive-gray, very dolomitic, mediumgrained ................ 5 8

Sandstone, medium-bedded, 

very light gray to brownishgray, dolomitic, fine- to 

medium-grained ........ 5 0

Dolomite, medium-bedded, 

light brownish-gray to 

brownish-gray, dense to 

finely crystalline; contains 

white coarse calcite 

crystals ............... 9

Sandstone, medium-bedded, 

dark-gray to light olivegray, dolomitic, 

medium-grained ....... 4 0

Dolomite, thin- to mediumbedded, medium dark gray, 

finely crystalline ....... 1 3

Sandstone, mediumbedded, yellowishgray, dolomitic, 

fine- to medium 

grained................. 1 6

10

11
Ft in 

Ordovician rocks Continued

Everton formation Continued

Dolomite, thin- to

medium-bedded, medium 

light gray, dense to finely 

crystalline; contains scattered sand grains and white 

coarse calcite crystals .... 3 10

Dolomite, medium-bedded, 

dark-gray to yellowishgray, sandy, finely 

crystalline; contains scattered sand grains and thin 

stringers of dolomitic 

sandstone ................ 2 2

Dolomite, medium-bedded, 

very light gray, pinkishgray, and yellowish-gray, 

sandy, very limy, very 

finely granular to finely 

crystalline; contains 

scattered sand grains and 

thin stringers of dolomitic 

sandstone ................ 4 0

Dolomite, medium-bedded, 

medium-gray, very finely 

granular to finely crystalline; contains scattered 

sand grains ............... 1 2

Dolomite, medium-bedded, 

medium-gray to light olivegray, dense to finely 

crystalline; contains scattered sand grains and white 

medium to coarse calcite 

crystals .................. 5 0

Dolomite, thin-bedded, 

light-gray, very finely 

granular to finely crystalline; contains scattered sand 

grains.................... 1 2

Dolomite, medium-bedded, 

medium dark gray, finely 

crystalline; contains white 

medium to coarse calcite 

crystals .................. 2 10

Dolomite, medium-bedded, 

olive-gray to light brownishgray, dense; contains scattered 

sand grains.............;. 1 2

Dolomite, medium-bedded, 

light brownish-gray, sandy, 

dense.................... 1 2

Sandstone, medium- to thickbedded, yellowish-gray to 

white, limy, fine- to 

medium-grained .......... 3 1

Dolomite, mediumbedded, brownishblack to medium 

dark gray, dense; 

contains scattered 

sand grains ............... 9

Dolomite, medium-bedded, 

medium dark gray, sandy, 

dense .................... 8

Sandstone, thin-bedded, 

yellowish-gray, slightly 

dolomitic, fine- to 

medium-grained .......... 2

Ft in_ 

Ordovician rocks Continued

Everton formation Continued

Sandstone, thin- to mediumbedded, yellowish-gray to 

white, limy, fine- to 

medium-grained ........ 1 1

Dolomite, medium-bedded, 

medium dark gray to 

brownish-gray, finely 

crystalline; contains 

scattered sand grains.... 2 5

Sandstone, medium-bedded, 

light brownish-gray to 

yellowish-gray, dolomitic, 

fine-to mediumgrained................ 5 0

Newton sandstone member:

Sandstone, medium- to thickbedded, yellowish-gray to 

white, fine- to mediumgrained; grains exhibit 

secondary growth ....... 5 0

Sandstone, medium- to 

thick-bedded, yellowishgray to white, fine- to 

medium-grained; grains 

exhibit secondary 

growth................. 5 0

Sandstone, medium- to 

thick-bedded, yellowishgray to white, slightly 

limy, fine- to mediumgrained; grains exhibit 

secondary growth........ 5 0

Sandstone, medi-um-bedded, 

yellowish-gray to white, 

slightly limy, fine- to 

medium-grained; grains 

exhibit secondary 

growth ................. 5 0

Sandstone, medium-bedded, 

yellowish-gray to white, 

limy, fine- to medium-grained; 

grains exhibit secondary 

growth................. 4 3

(Base of Newton sandstone member)

Limestone, medium-bedded, 

light-gray, sandy, oolitic, 

dense to finely crystalline; 

contains scattered sand 

grains at base; sand content 

increases upward ....... 2 0

Limestone, medium- to 

thick-bedded, mediumgray to light olive-gray, 

dense; contains scattered 

sand grains ............ 4 0

Sandstone, thin- to mediumbedded, very light gray to 

white, limy, fine- to 

medium-grained........ 9

Limestone, thin- to mediumbedded, medium-gray, 

sandy, dense to finely 

crystalline;ostracods... 1 0

Limestone, thin-bedded, 

medium light gray, dense 

to finely crystalline; contains scattered sand 

grains ................. 3

12
Ordovician rocks Continued

Everton formation Continued

Sandstone, medium-bedded, 

yellowish-gray, limy, fineto medium-grained....... .

Limestone, medium-bedded, 

medium light gray, slightly 

oolitic, dense to finely 

crystalline; contains scattered sand grains ..........

Sandstone, medium-bedded, 

very light gray to yellowishgray, limy, fine- to mediumgrained ...................

Limestone, thin-bedded, 

medium-gray, oolitic, dense 

to finely crystalline; contains 

scattered sand grains.......

Sandstone, medium-bedded, 

light olive-gray to yellowishgray, limy, fine- to 

medium-grained ..........

Limestone, medium-bedded, 

light olive-gray to very 

light gray, oolitoid, sandy, 

very finely granular; contains thin stringers of 

limy sandstone .......... .

Sandstone, medium-bedded, 

very light gray, limy, 

fine- to medium-grained, 

contains limestone granules; 

wavy basal surface .......

Limestone, medium-bedded, 

light brownish-gray to olive - 

gray, dense to finely crystalline; contains scattered sand 

grains ....................

Limestone, medium-bedded, 

light brownish-gray to 

light olive-gray, sandy, 

dense to finely 

crystalline ................

Sandstone, thick-bedded, white, 

limy, fine- to mediumgrained ........'...........

Sandstone, thick-bedded, white, 

limy, fine- to mediumgrained ...................

Sandstone, thick-bedded, white, 

limy, fine- to medium - 

grained ..................

Limestone, medium-bedded, 

medium-gray, dense to 

finely crystalline; contains 

scattered sand grains ......

Limestone, medium-bedded, 

medium-gray, sandy, dense 

to finely crystalline........

Limestone, medium-bedded, 

brownish-gray to olivegray, dense to finely 

crystalline; cryptozoon 

structures.................

Sandstone, thin- to mediumbedded, light brownishgray to light-gray, very 

limy, fine- to mediumgrained ...................

Ft in

1 1

1 2

Ft in

7

2 6

5 0

4 0

1 0

11

2 0

11

Ordovician rocks Continued

Everton formation Continued

Limestone, medium-bedded, 

brownish-gray to light olivegray, dense to finely crystalline; cryptozoon 

structures ............. ;

Sandstone, thin- to mediumbedded, yellowish-gray to 

light olive-gray, limy, fineto medium-grained ..... (

Limestone, fissile to thinbedded, medium light 

gray, slightly sandy, 

oolitoid, dense to finely 

crystalline .............

Sandstone, thin-bedded, 

light-gray to yellowishgray, very limy, fine- to 

medium-grained; contains 

small flat limestone 

pebbles ................

Limestone, thin- to mediumbedded, medium-gray to 

light brownish-gray, dense; 

contains thin stringers 

of white, limy 

sandstone .............

Sandstone, medium-bedded, 

light-gray to yellowishgray, limy, fine- to 

medium-grained; contains 

dense limestone granules 

in the lower part ........ :

Limestone, very thin to 

thin-bedded, mediumgray to medium dark 

gray, dense ............

Sandstone, medium-bedded, 

light-gray to yellowishgray, very limy, 

medium-grained........

Sandstone, medium-bedded, 

yellowish-gray, limy, 

medium-grained ....... : Sandstone, medium-bedded, 

very light gray to yellowishgray, very limy, mediumgrained ............... '.

Limestone, medium-bedded, 

medium-gray to light olivegray, sandy, dense to finely 

crystalline; contains dense, 

oolitic limestone pebbles 

as much as 1 inch in diameter 

in a matrix of very sandy 

limestone ..............

Sandstone, medium-bedde'd, 

very light gray to yellowishgray, very limy, mediumgrained ................

Limestone, medium-bedded, 

medium light gray to light 

olive-gray, oolitic, dense; 

contains scattered sand 

grains.................

Limestone, medium-bedded, 

. medium light gray to light olivegray, oolitic, dense......

13
Ordovician rocks Continued

Everton formation Continued

Limestone, medium-bedded, 

yellowish-gray, very 

sandy, dense to finely 

crystalline .............. .

Limestone, thin- to mediumbedded, olive-gray to lightgray, oolitic, dense to finely 

crystalline ...............

Sandstone, medium-^bedded, 

light-gray to yellowish-gray, 

limy, fine- to mediumgrained ..................

Sandstone, thick-bedded to 

massive, light-gray to 

yellowish-gray, slightly 

limy, medium- to coarsegrained; grains exhibit 

secondary growth ........ .

Sandstone, thick-bedded to 

massive, light-gray to 

yellowish-gray, slightly 

limy, medium-grained; grains 

exhibit secondary growth; 

(lower 4 feet of beds usually 

below water level)..........

Base of section at river level.

Ft in

T8"7 T

D. Section of the St. Peter sandstone and Everton 

formation on the east side of the Buffalo River 

and north of Hasty-Jasper road in the SW^SWi 

sec. 26, T. 16 N., R. 20 W., Newton County, 

Ark. Base of section about 4 feet above river 

level.

Carboniferous (Mississippian) rocks: 

Boone formation:

St. Joe limestone member. 

Basal sandstone member. 

Covered interval ..........

Ft in

7 0

Ordovician rocks:

St. Peter sandstone:

Sandstone, medium-bedded, white 

to very light gray, very slightly 

limy, medium-grained; grains 

exhibit much secondary growth; 

quartzitic beds in middle of 

unit.......................... 2

Q O

Everton formation: 

Jasper member:

' Limestone, platy to thinbedded, light-gray, 

dense ................... 1 2

Sandstone, thin-bedded, very 

light gray, very limy, mediumgrained .................. 8

Limestone, platy to thinbedded, light-gray, 

dense .................... 1 3

Limestone, medium-bedded, 

light-gray, oolitic, dense; 

contains scattered sand 

grains ................... 2 9

Ft in 

Ordovician rocks Continued

Everton formation Continued 

Jasper member Continued

Covered interval.......... 6

Limestone, thin-bedded, 

light-gray, oolitic, dense; 

contains scattered sand 

grains................. 2

Sandstone, thick-bedded, 

very light gray to white, 

slightly limy, mediumgrained; grains exhibit 

secondary growth ....... 3 8

Limestone, medium-bedded, 

light-gray to very light 

gray, very sandy, dense to 

finely crystalline ....... 1 6

Limestone, medium- to 

thin-bedded, light-gray, 

oolitic, sandy, dense to 

finely crystalline; sand 

content decreases upward; 

ostracods.............. 1 6

Limestone, medium-bedded, 

very light gray to yellowishgray, dense to finely crystalline; contains scattered sand 

grains; ostracods .......... 8

Limestone, thin-bedded,'lightgray to yellowish-gray, 

dense to finely crystalline; 

contains scattered sand 

grains ................ 1 1

Limestone, thin-bedded, 

light-gray to yellowishgray, very sandy, finely 

crystalline............. 6

Sandstone, medium-bedded, 

white to very light gray, 

very limy, medium - 

grained ............... 1 6

Covered interval ......... 6

Limestone, mediumbedded, light-gray, oolitic, 

dense to finely crystalline; 

ostracods ............. 6

Covered interval ......... 6

Limestone, medium-bedded, 

yellowish-gray to light 

olive-gray, dense to finely 

crystalline; scattered sand 

grains ................ 1 2

Limestone, medium-bedded, 

yellowish-gray to light 

olive-gray, very sandy, 

finely crystalline....... 3

Limestone, medium-bedded, 

yellowish-gray to light 

olive-gray, dense to finely 

crystalline; contains scattered sand grains....... 1 0

Sandstone, thin-bedded, white 

to very light gray, very 

limy, fine- to mediumgrained ............... 11

Limestone, medium-bedded, 

very light gray to lightgray, oolitoid, dense to finely 

crystalline; contains scattered 

sand grains ............ 5

14
Ordovician rocks Continued

Everton formation Continued 

Jasper member Continued

Sandstone, thin-bedded, very 

light gray to yellowishgray, very limy, medium - 

grained ..................

Sandstone, medium-bedded, 

light-gray, medium-grained; 

grains exhibit secondary 

growth ...................

Limestone, medium-bedded, 

medium light gray, oolitoid, 

dense to finely 

crystalline .............. .

Limestone, thin-bedded, 

light-gray to light olivegray, silty, oolitic, dense 

to finely crystalline ...... .

Limestone, medium-bedded, 

light-gray, oolitic, dense 

to finely crystalline; 

ostracods ................

Limestone, thick-bedded, 

light olive-gray, oolitic, 

dense to finely crystalline; 

contains scattered sand 

grainsjostracods, 

trilobites ................

Limestone, medium-bedded, 

very light gray to yellowishgray, oolitoid, sandy, finely 

crystalline; contains limestone 

granules; ostracods .......

Limestone, medium-bedded, 

very light gray to light-gray, 

oolitic, dense to finely crystalline; ostracods .......... .

Limestone, medium-bedded, 

light-gray to very light gray, 

oolitoid, dense to finely 

crystalline; contains scattered sand grains......... .

Limestone, thin-bedded, very 

light gray, oolitoid, dense 

to finely crystalline; contains scattered sand grains; 

ostracods ................

Limestone, platy to very 

thin bedded, light-gray to 

light brownish-gray, sandy, 

dense to finely crystalline; 

ostracods.................

Limestone, thin- to mediumbedded, very light gray to 

yellowish-gray, finely to 

medium-crystalline; 

ostracods .................

Limestone, very thin 

bedded, light-gray to very 

light gray, silty, dense to 

medium-crystalline; ostracods; 

unit weathers back ........

Limestone, mediumbedded, medium light 

gray to brownishgray, oolitic, dense 

to finely crystalline; 

ostracods .................

Ft in Ft in

2 3

3 11

11

1 6

Ordovician rocks Continued

Everton formation Continued 

Jasper member Continued

Sandstone, mediumbedded, white to very light 

gray, very slightly limy, 

fine- to medium-grained; 

grains exhibit secondary 

growth .................

Limestone, thin-bedded,

very light gray to yellowishgray, dense to finely crystalline; contains scattered sand 

grains ................ .

Sandstone, medium-bedded, 

very light gray to white, 

limy, medium-grained ....

Limestone, thin-bedded, 

light-gray to yellowishgray, oolitoid, finely 

to medium-crystalline; 

ostracods ...............

Sandstone, medium- to 

thick-bedded, light-gray 

to white, limy, fine- to 

medium-grained; grains 

exhibit secondary 

growth .................. .

Limestone, thin-bedded, 

very light gray, sandy, 

dense to finely 

crystalline ..............

Sandstone, medium-bedded, 

white to very light gray, 

slightly limy, fine- to 

medium-grained; grains 

exhibit secondary 

growth .................

Sandstone, thin-bedded, 

white to very light gray, 

very limy, fine- to 

medium-grained; contains a limestone 

stringer i to 1 inch thick 

at top of unit ............

Limestone, thin-bedded,

very light gray to yellowishgray, dense to mediumcrystalline; contains scattered sand grains; 

ostracods ............. .

Sandstone, medium-bedded, 

yellowish-gray to white, 

limy, fine- to mediumgrained ................ .

Sandstone, medium-bedded, 

yellowish-gray to white, 

quartzitic, fine- to mediumgrained .................

Sandstone, medium-bedded, 

yellowish-gray to white, 

limy, fine- to mediumgrained .................

Sandstone, medium-bedded, 

white to very light gray, 

limy, fine- to mediumgrained; contains stringers 

of sandstone with siliceous 

cement ...................

10

11

15
Ordovician rocks Continued

Everton formation Continued 

Jasper member Continued

Limestone, mediumbedded, very light gray 

to yellowish-gray, 

dense to medium-crystalline; contains scattered 

sand grains; ostracods .....

Limestone, mediumbedded, very light gray 

to yellowish-gray, sandy, 

dense to medium-crystalline; ostracods ............

Sandstone, medium-bedded, 

light-gray to white, limy, 

medium- to fine-grained; 

grains exhibit secondary 

growth; ostracods ........ .

(Base of Jasper member)

Dolomite, thick-bedded, 

medium light gray to 

light brownish-gray, 

sandy, dense to finely 

crystalline.............. .

Sandstone, thin-bedded, 

light-gray to dense, limy, 

dolomitic, mediumgrained ..................

Dolomite, medium- to thickbedded, medium light gray 

to light brownish-gray, 

sandy, dense; contains 

scattered sand grains and 

thin stringers of dolomitic 

sandstone ............... .

Dolomite, medium-bedded, 

medium-gray to brownishgray, very sandy, dense to 

finely crystalline..........

Sandstone, medium-bedded, 

white to very light gray, 

medium-grained; grains 

exhibit secondary 

growth ................. .

Sandstone, very thin bedded, 

light-gray to white, quartzitic, slightly dolomitic, 

fine- to medium-grained....

Sandstone, medium-bedded, 

white to very light gray, 

slightly limy, medium- to 

coarse-grained; grains exhibit secondary growth .....

Dolomite, medium-bedded, 

light-gray to light brownishgray, sandy, finely to 

medium-crystalline; contains thin sandstone 

stringers ............... .

Dolomite, thin- to mediumbedded, light-gray to light 

olive-gray, finely crystalline; contains white coarse 

dolomite crystals ........ .

Dolomite, medium-bedded, 

light-gray, very sandy, 

dense to finely 

crystalline ...............

Ft in Ft in

5 0

4 3

4 5

2 5

Ordovician rocks Continued

Everton formation Continued

Dolomite, medium- to 

thick-bedded, lightgray, sandy, dense to 

finely crystalline; 

ostracods ...............

Dolomite, thick-bedded, 

light-gray, dense to 

finely crystalline ...... .

Covered interval ......... .

Dolomite, medium-bedded, 

light-gray, sandy, dense 

to finely crystalline ......

Covered interval ......... .

Sandstone, medium-bedded, 

very light gray to white, 

slightly dolomitic, 

medium-grained........ .

Covered interval ..........

Sandstone, medium-bedded, 

very light gray to white, 

slightly dolomitic, mediumgrained; grains exhibit 

secondary growth........ .

Dolomite, medium-bedded, 

medium-gray to medium 

light gray, dense to finely 

crystalline; contains scattered sand grains ...... .

Sandstone, medium-bedded, 

very light gray to white, 

slightly dolomitic, mediumgrained; grains exhibit 

secondary growth ...... .

Covered interval ........ .

Newton sandstone member:

Sandstone, medium- to thickbedded, very light gray to 

white, medium-grained; 

grains exhibit secondary 

growth..................

Sandstone, medium- to 

thick-bedded, very light 

gray to white, mediumgrained; grains exhibit 

secondary growth ........

Base of section about 4 feet above river level.

5 7

3 7

1 2

5 0

10

11

10

10

7 0

1 10

1 7

E. Section of the St. Peter sandstone and Everton formation at Carver near the north end of the 

Buffalo River bridge on State Route 123, NWisec. 6, 

T. 15 N., R. 19 W. , Newton County, Ark.

Carboniferous (Mississippian) rocks: 

Boone formation.

Ordovician rocks:

Fern vale limestone

2 3

2 10

Plattin limestone

Ft in_

6 11

32 7

St. Peter sandstone:

Sandstone, soft, greenishwhite, very limy, fine- to 

medium-grained ........

16
Ordovician rocks Continued

St. Peter sandstone Continued

Covered interval .........../.... .

Sandstone, thin-bedded, white, 

limy; similar to that above.......

Covered interval..................

Sandstone, thin-bedded, greenishgray, slightly argillaceous, limy; 

similar to that above ............

Dolomite, dull-gray, silty, very 

finely granular; contains very thin 

laminae of very fine grained 

sandstone ......................

Sandstone, greenish-white, limy; 

similar to the sandstones 

above .........................

Dolomite, gray-buff, very finely 

granular.......................

Covered interval ................ .

Sandstone, white, limy, fine- to 

medium-grained................

Sandstone, thin-bedded, brown, 

dolomitic, fine-grained..........

Covered interval .................

Sandstone, thin-bedded, white to 

brown, dolomitic, finegrained ........................

Dolomite, very thin bedded, graybuff, sandy, fine-grained; 

ostracods ......................

Sandstone, medium-bedded, buffbrown, dolomitic, fine-grained; 

and white fine- to medium-grained 

sandstone ......................

Covered interval..................

Sandstone, soft, very thin bedded, 

pinkish- to greenish-white, fineto medium-grained; grains exhibit 

secondary growth ...............

Covered interval..................

Sandstone, medium-bedded, white, 

limy, medium-grained; grains 

exhibit secondary growth ........

Ft in Ft in

54

Everton formation: 

Jasper member:

Dolomite, massive, darkgray to brown, medium 

to coarsely crystalline...... 8

Sandstone, thin-bedded, white, 

fine- to medium-grained .... 1

Covered interval ............. 6

Sandstone, medium-bedded, 

white, fine- to mediumgrained .................... 2

Covered interval .............. 2

Limestone, medium-bedded, 

light-buff, slightly sandy, 

finely crystalline............ 1

Limestone, medium-bedded, 

buff, finely crystalline.......

Limestone, medium-bedded, 

buff, sandy ................

Limestone, light-buff, oolitic 

or microfossiliferous, finely 

crystalline; grades downward into 

buff sandy limestone ...'..... 1

6

10

3

11

Ordovician rocks Continued

Everton formation Continued 

Jasper member Continued

Sandstone, medium-bedded, 

white, very limy, 

medium-grained.........

Limestone, medium- to 

thick-bedded, buff, mediumcrystalline; contains scattered 

sand grains; grades downward 

into white limy fine-grained 

sandstone ............ .

Limestone, medium-bedded, 

buff, finely crystalline to 

dense .................

Sandstone, greenish-white, 

limy, fine-grained .....

Dolomite, thin-bedded, 

brown, mediumcrystalline............ .

Covered interval .........

Limestone, medium-bedded, 

buff, microfossiliferous, 

finely crystalline; abundant 

ostracods ..............

Limestone, medium-bedded, 

light-buff, sandy, finely 

crystalline ............

Limestone, thin-bedded, 

light-buff, sandy, finely 

crystalline .............

Limestone, thin-bedded, 

light-buff, oolitic or 

microfossiliferous, dense; 

calcite; sand grains in upper 

part...................

Limestone, thin-bedded, 

light-buff, oolitic or 

microfossiliferous, sandy; 

sand content increases 

upward ................

As above, but very thin 

bedded ................

Limestone, thin-bedded, 

light-buff, finely figured, 

finely crystalline .......

Covered interval ........

Limestone, thin-bedded, 

light-buff, finely figured, 

finely crystalline........

Sandstone, white, slightly 

limy, medium-grained; 

grains exhibit secondary 

growth ................

Sandstone, massive, white, 

medium-grained.........

Limestone, gray-buff, 

microfossiliferous, 

finely crystalline; 

abundant ostracods......

Sandstone, thin- to 

medium-bedded, tan 

to white, fine- to 

medium-grained 

(usually below water 

level) .................

11

11

10

7

52

17
F. Section of the St. Peter sandstone and Everton 

formation on the north side of the Buffalo River 

in the SWiSEl sec. 31, T. 16 N., R. 19 W., 

Newton County, Ark. Base of section at river level.

Ft in

Carboniferous (Mississippian) rocks: 

Boone formation:

St. Joe limestone member. 

Basal sandstone member...

(The gradational contact of the 

St. Joe limestone member and 

the basal sandstone member is 

exposed at the top of this unit. 

The contact of the basal sandstone member and the underlying St. Peter sandstone is not 

exposed; it lies somewhere in the 

following covered interval.)

Covered interval 10

Ordovician rocks:

St. Peter sandstone:

Sandstone, medium-bedded, 

dusky-yellow, silty, limy, 

fine- to medium-grained; 

grains exhibit some secondary 

growth ........................ 2 0

Covered interval ................. 10 0

Sandstone, thin- to medium-bedded, 

yellowish-gray to white, slightly 

limy, fine- to medium-grained; 

grains exhibit some secondary 

growth ........................ 1 5

Dolomite, thin- to medium-bedded, 

pale-brown, silty, finely granular; 

contains scattered sand 

grains ........................ 8

Sandstone, medium-bedded, lightbrown to white, quartzitic, slightly 

dolomitic, fine-grained; contains 

some white coarse dolomite 

crystals ....................... 1 7

Dolomite, thin- to medium-bedded, 

pale-brown, silty, finely granular; 

contains scattered sand 

grains ........................ 5

Sandstone, thick-bedded, duskyyellow to light olive-gray, silty, 

dolomitic, very fine to fine-grained; 

the amount of dolomite increases 

upward in the unit; 

ostracods...................... 2 11

Covered interval .................. 9 0

Sandstone, deeply weathered and 

poorly exposed, medium-bedded, 

yellowish-gray to white, mediumto coarse-grained .............. 5 0

Sandstone, medium-bedded,

yellowish-gray to white, slightly

limy; grains exhibit secondary

growth; slightly irregular basal

surface ........................ 5 8

38 8

Ft. in.

Ordovician rocks Continued 

Everton formation: 

Jasper member:

Dolomite, medium-bedded, 

brownish-gray, mediumcrystalline; contains scattered 

sand grains ............. 1 1

Sandstone, medium-bedded, 

white, limy, fine- to 

medium-grained ....... 8

Dolomite, medium-bedded, 

brownish-gray, finely to 

medium-crystalline; contains scattered sand 

grains ................. 4 4

Dolomite, medium-bedded, 

brownish-gray, slightly 

silty, medium-crystalline; 

contains scattered sand 

grains ................. 4 7

Sandstone, medium-bedded, 

yellowish-gray to white, 

slightly limy, fine- to 

medium-grained........ 1 4

Dolomite, thin-bedded, 

light brownish-gray, silty, 

finely crystalline; contains 

coarse calcite crystals 

and thin stringers of yellowishgray dolomitic fine- to 

medium-grained 

sandstone.............. 2 3

Covered interval ......... 1 0

Sandstone, medium-bedded, 

brownish-gray, dolomitic, 

fine- to 

medium-grained ....... 2 4

.Sandstone, medium-bedded, 

yellowish-gray, limy, 

fine- to mediumgrained ............... 2 3

Limestone, medium-bedded, 

light olive-gray, oolitic, 

dense to finely crystalline; 

ostracods ............. 2 6

Limestone, medium-bedded, 

light olive-gray, very 

sandy, finely 

crystalline ............ 4

Limestone, medium-bedded, 

light olive-gray, oolitic, 

dense to finely crystalline; ostracods ......... 1 4

Limestone, medium-bedded, 

light olive-gray, sandy, 

finely crystalline ....... 9

Limestone, medium-bedded, ' 

yellowish-gray, sandy, 

finely crystalline ....... 1 1

Sandstone, medium-bedded, 

yellowish-gray, limy, 

fine- to medium-grained; 

ostracods ............. 3 4

Limestone, medium-bedded, 

light olive-gray, oolitic, 

finely to mediumcrystalline ............ 5

18
Ft in Ft in

Ordovician rocks -Continued

Everton formation Continued 

Jasper member Continued

Sandstone, thin-bedded, 

yellowish-gray, limy, 

fine- to medium-grained; 

grades into overlying 

unit ..................... . 2

Limestone, thin- to mediumbedded, light brownishgray, slightly oolitic, 

dense to finely crystalline.... 2

Limestone, thick-bedded, 

light brownish-gray, slightly 

oolitic, finely 

crystalline ................ 4

Limestone, thick-bedded, 

light brownish-gray, oolitic, 

finely crystalline; 

ostracods ................. 2

Limestone, thick-bedded, 

alternately sandy and 

nonsandy, light brownishgray, oolitic, finely crystalline; ostracods ............. 5

Limestone, thin-bedded, light 

brownish-gray, sandy, finely 

crystalline ............... .

Limestone, thin-bedded, light 

olive-gray, oolitic, finely 

crystalline; contains mediumsized calcite crystals and 

pyrite altered to limonite; 

ostracods .................

Limestone, thin- to mediumbedded, light olive-gray, 

oolitic, finely crystalline; 

contains some thin stringers 

of sandy limestone.......... 4

Sandstone, thin- to mediumbedded, pale-brown to white, 

limy, medium-grained; grains 

exhibit secondary 

growth..................... 3

Limestone, medium-bedded, 

light brownish-gray, oolitic, 

finely to mediumcrystalline ............... .

Sandstone, medium-bedded, 

white, limy, fine- to 

medium-grained ......... .

Limestone, medium-bedded, 

light brownish-gray, oolitic, 

finely to mediumcrystalline ............... .

Sandstone, medium-bedded, 

yellowish-gray to white, 

limy, mediumgrained .................... 2

Limestone, medium-bedded, 

brownish-gray, oolitic, finely 

to medium-crystalline; 

ostracods ..................

Limestone, medium-bedded, 

brownish-gray, finely to 

medium-crystalline; contains limestone granules.... 1

Sandstone, thick-bedded,

yellowish-gray, limy, medium - 

grained ................... 3

11

Ordovician rocks Continued

Everton formation Continued 

Jasper member Continued

Limestone, thin- to mediumbedded, light olive-gray, 

finely to medium-crystalline; 

contains limestone granules; 

ostracods .............

Limestone, thin-bedded, 

light olive-gray, sandy, 

finely to mediumcrystalline ........... .

Sandstone, thick-bedded, 

yellowish-gray, limy, 

medium-grained; grains 

exhibit secondary 

growth ................

Limestone, fine- to mediumbedded, light brownishgray, finely crystalline; 

contains scattered sand 

grains ............... .

Sandstone, medium-bedded, 

yellowish-gray, limy, 

fine- to mediumgrained............... .

(Base of Jasper member)

Sandstone, medium-bedded, 

yellowish-gray, dolomitic, 

fine- to mediumgrained............... .

Sandstone, medium-bedded, 

light olive-gray to 

yellowish-gray, dolomitic, 

medium-grained...... .

Dolomite, medium-bedded, 

light brownish-gray, 

sandy, finely 

crystalline ........... .

Sandstone, medium-bedded, 

light brownish-gray, 

dolomitic, mediumgrained .............. .

Sandstone, medium-bedded, 

yellowish-gray, limy, 

medium-grained ........

Sandstone, medium-bedded, 

light brownish-gray, very 

dolomitic, fine- to mediumgrained ................

Sandstone, medium-bedded, 

yellowish-gray, slightly 

limy, medium-grained; 

grains exhibit secondary 

growth ................

Dolomite, medium-bedded, 

brownish-gray, very 

sandy, finely 

crystalline ........... .

Dolomite, medium-bedded, 

brownish-gray, sandy, 

finely crystalline...... .

Dolomite, medium-bedded, 

brownish-gray, finely 

crystalline ............

Dolomite, medium-bedded, 

brownish-gray, sandy, 

finely crystalline ..... .

11

10

19
Ft in_ 

Ordovieian rocks Continued

Everton formation Continued

Dolomite, medium-bedded, 

brownish-gray, sandy, finely 

crystalline; contains thin 

stringers of yellowish-gray 

fine- to medium-grained 

slightly dolomitic 

sandstone.................. 5 0

Dolomite, medium-bedded, 

brownish-gray, sandy, 

finely to mediumcrystalline................. 5 4

Dolomite, medium-bedded, 

brownish-gray, dense to 

finely crystalline; contains 

scattered sand grains ....... 5 0

Sandstone, medium-bedded, 

yellowish-gray to brownishgray, dolomitic, fine- to 

medium-grained; 

ostracods.................. 2 0

Dolomite, medium-bedded, 

brownish-gray, sandy, finely 

to medium-.crystalline ...... 3 0

Dolomite, medium-bedded, 

brownish-gray, finely to 

medium-crystalline; contains some thin stringers of 

sandy dolomite............. 5 4

Dolomite, thin- to mediumbedded, brownish-gray, 

limy, finely to coarsely 

crystalline; contains many 

white coarse calcite and 

dolomite crystals ........... 2 0

Dolomite, medium-bedded, 

brownish-gray, finely 

crystalline; contains white 

coarse calcite crystals...... 2 6

Dolomite, medium-bedded, 

brownish-gray, finely 

crystalline; contains scattered sand grains.......... 2 2

Sandstone, medium-bedded, 

light brownish-gray, 

dolomitic, fine- to mediumgrained .................... 1 0

Dolomite, medium-bedded, 

brownish-gray, finely 

crystalline; contains scattered 

sand grains ................ 1 0

Dolomite, medium-bedded, 

brownish-gray, finely crystalline; contains scattered 

sand grains ................ 2 9

Sandstone, medium-bedded, 

light brownish-gray, dolomitic, medium-grained ...... 1 10

Dolomite, medium-bedded, 

light brownish-gray, sandy, 

finely crystalline ........... 1 9

Dolomite, thin- to medium - 

bedded, light brownishgray, sandy, finely crystalline; 

sand content increases upward 

in unit (few scattered sand 

grains at base, very sandy at 

top)........................ 3 4

Ft jin, 

Ordovician rocks Continued

Everton formation Continued

Sandstone, medium-bedded, 

yellowish-gray, limy, 

medium-grained; contains 

stringers of light brownishgray dolomitic mediumgrained sandstone .......... 2 3

Sandstone, medium-bedded, 

yellowish-gray to light 

brownish-gray, slightly 

limy, fine- to mediumgrained; contains stringers 

of light brownish-gray dolomitic fine- to mediumgrained sandstone........... 4 0

Dolomite, very thin bedded, 

brownish-gray, slightly 

sandy, finely crystalline .... 1

Sandstone, medium-bedded, 

yellowish-gray, -limy, fineto medium-grained; contains stringers of light - 

brownish-gray dolomitic 

fine- to medium-grained 

sandstone .................. 11

Newton sandstone member:

Sandstone, medium-bedded, 

yellowish-gray, slightly 

limy, fine- to mediumgrained .................. 4 9

Sandstone, medium- to thickbedded, yellowish-gray, 

slightly limy, fine- to mediumgrained ................... 3 8

Sandstone, massive, yellowishgray, limy, fine- to medium - 

grained; lime content increases 

downward; grains exhibit much 

secondary growth ........... 5 0

(Base of Newton sandstone member)

Limestone, medium-bedded, light 

olive-gray, sandy, finely 

crystalline ................ 10

Limestone, thin-bedded, olivegray, slightly dolomitic, 

dense to finely crystalline.... 4

Limestone, thin-bedded, olivegray, sandy, slightly dolomitic, 

finely crystalline............ 7

Limestone, medium-bedded, 

light olive-gray, very sandy, 

finely crystalline ........... 6

Sandstone, medium-bedded, light 

olive-gray, very limy, 

medium-grained............ 7

Limestone, medium-bedded, 

medium-gray, finely crystalline; contains white coarse 

calcite crystals ............. 2 2

Sandstone, medium-bedded, 

yellowish-gray, slightly 

limy to dolomitic, fine- to 

medium-grained; grains 

exhibit secondary 

growth .................... 2 5

Base of section at river level. 

178

20
G. Section of the St. Peter sandstone and Everton 

formation on the north side of the Buffalo River 

in the NE±NW± sec. 34, T. 16 N,, R. 19 W., 

Newton County, Ark. Base of section at river 

level.

Ft in_

Ordovician rocks: 

Plattin limestone. 

St. Peter sandstone:

Sandstone, poorly exposed, mediumbedded, light-brown, silty, limy, 

slightly dolomitic, finegrained ........................ 4 0

Covered interval ................ i 13 0

Sandstone, badly weathered, thinto medium-bedded, yellowishgray, very fine to finegrained ....................... 2 7

Sandstone, medium-bedded, 

yellowish-gray, very fine to 

fine-grained with scattered 

coarse grains; grains exhibit 

secondary growth............... 4 7

Sandstone, medium-bedded, 

crossbedded, yellowish-gray to 

brownish-gray, fine-grained; 

grains exhibit secondary 

growth ........................ 3 10

Sandstone, thin-bedded, yellowish- 

.gray, fine- to mediumgrained ........................ 1 4

Everton formation: 

Jasper member:

Dolomite, thin- to medium - 

bedded,brownish-gray, 

sandy, medium-crystalline; 

contains thin stringers of 

dolomitic sandstone......... 4 1

Covered interval ............. 1 7

Dolojnite, thin-bedded, 

brownish-gray, sandy, 

finely crystalline............ 4

Dolomite, thin-bedded, darkgray, mediumcrystalline ................ 3

Dolomite, medium-bedded, 

brownish-gray, sandy, 

finely crystalline ........... 3 10

Dolomite, medium-bedded, 

brownish-gray, mediumcrystalline; contains scattered sand grains in lower 

half of unit...........'...... 7

Dolomite, medium-bedded, 

light-brown, sandy, finely 

crystalline ................. 1 0

Sandstone, medium-bedded, 

light-brown to light olivegray, dolomitic, mediumgrained ................... 9

Dolomite, medium-bedded, 

light brownish-gray, mediumcrystalline; slightly silty in 

lower part ................ 2 7

Ordovician rocks Continued H IS. 

Everton formation Continued 

Jasper member Continued

Sandstone, medium-bedded, 

yellowish-gray, slightly 

dolomitic, fine- to mediumgrained; grains exhibit 

secondary growth .......... 4 4

Dolomite, thin-bedded, 

grayish yellow green, silty, 

 finely crystalline; contains 

scattered sand grains and 

some white coarse calcite 

crystals ................... 1 10

Dolomite, medium-bedded, 

brownish-gray, slightly 

silty, finely crystalline...... 2 8

Dolomite, thin-bedded, 

brownish-gray, mediumcrystalline; contains scattered sand grains .......... 4

Sandstone, medium-bedded, 

light brownish-gray, dolomitic, 

medium-grained ........... 2 4

Sandstone, medium-bedded, 

yellowish-gray, very limy, 

medium-grained; 

ostracods ................. 2 3

Covered interval ............. 3 0

Limestone, medium-bedded, 

light olive-gray, oolitic, dense 

to finely crystalline; many 

ostracods ................. 2 0

Limestone, medium-bedded, 

light olive-gray, finely 

crystalline; contains 

limestone granules; 

ostracods .................. 1 0

Limestone, medium-bedded, 

light olive-gray, sandy, 

finely crystalline; contains 

limestone granules; 

ostracods .................. 2 11

Limestone, medium-bedded, 

light olive-gray, oolitic, 

dense to finely crystalline; 

ostracods ................. 5

Dolomite, medium-bedded, 

light brownish-gray, mediumcrystalline; contains white 

coarse calcite crystals ..... 1 1

Dolomite, thin-bedded, light 

brownish-gray, sandy, 

medium-crystalline; contains white coarse calcite 

crystals .................. 4

Limestone, medium-bedded, 

yellowish-gray to light olivegray, oolitic, finely crystalline ; ostracods ............. 3 2

Dolomite, medium-bedded, 

brownish-gray, slightly limy, 

finely to mediumcrystalline ................ 6

Sandstone, medium-bedded, 

yellowish-gray, limy, fineto medium-grained; grains 

exhibit secondary 

growth .................... 3 6

21
Ft in_ 

Ordovician rocks Continued

Everton formation Continued 

Jasper member Continued

Limestone, medium-bedded, 

light olive-gray, oolitic 

and oolitoid, finely crystalline; ostracods in lower 

4 inches ................... 2 2

Sandstone, medium-bedded, 

yellowish-gray, limy, fineto medium-grained; grains 

exhibit secondary growth..... 2 1

Covered interval ............. 5

Limestone, thin- to mediumbedded, light olive-gray, 

oolitic, finely crystalline... . 8

Covered interval ............. 5

Sandstone, thin- to mediumbedded, yellowish-gray, 

medium-grained; grains 

exhibit secondary 

growth..................... 2 4

(Base of Jasper member)

Sandstone, thfn-bedded, yellowishgray, dolomitic, mediumgrained .................... 4

Dolomite, medium-bedded, 

light brownish-gray, finely 

to medium-crystalline; contains medium-sized calcite 

crystals and scattered sand 

grains ..................... 1 8

Sandstone, thin-bedded,

yellowish-gray to light brownishgray, very dolomitic, fine- to 

medium -grained; 

ostracods .................. 3 8

Sandstone, medium-bedded, 

light brownish-gray, very 

dolomitic, fine- to 

medium-grained ............ 4 11

Dolomite, medium-bedded, 

light brownish-gray, sandy, 

very finely granular; contains 

.white coarse calcite 

crystals ................... 2 10

Dolomite, medium-bedded, 

light brownish-gray, slightly 

limy, sandy, finely 

crystalline ................ 4 11

Dolomite, thin- to mediumbedded, brownish-gray, 

finely crystalline; cryptozoon(?) 

structures ................ I 2

Sandstone, medium-bedded, 

light brownish-gray, very 

dolomitic, fine- to coarsegrained; slightly limy in 

upper half ................. 2 7

Sandstone, thin- to mediumbedded, yellowish-gray, 

slightly limy, medium-grained; 

grains exhibit secondary 

growth .................... 11

Dolomite, thin-bedded, brownishgray, dense ................ 2

Sandstone, thin-bedded,

yellowish-gray, slightly limy, 

medium-grained ........... 3

Fi in_ 

Ordovician rocks Continued

Everton formation Continued

Dolomite, mediumbedded, light-gray to 

brownish-gray, sandy, 

finely granular .............. 2 7

Dolomite, medium-bedded, 

 brownish-gray, sandy, finely 

granular; contains thin 

nonsandy dolomite 

stringers ............. 1 0

Sandstone, thin-bedded, 

light brownish-gray, limy, 

medium-grained ............ 4

Dolomite, medium- to thickbedded, brownish-gray, 

sandy, finely 

crystalline ................ 2 11

Dolomite, thin-bedded,

brownish-gray, sandy, finely 

crystalline; contains mediumsized calcite crystals; 

ostracods .................. 4

Dolomite, medium-bedded, 

brownish-gray, dense to 

very finely granular; contains scattered sand grains 

and white coarse calcite 

crystals .................. 2 6

Sandstone, medium- to thickbedded, brownish-gray, 

dolomitic, fine- to mediumgrained; contains white coarse 

calcite crystals ............ 2 7

Dolomite, thin-bedded,

brownish-gray, sandy, dense 

to very finely granular; contains thin stringers of 

nonsandy dolomite .......... 1 0

Dolomite, medium- to thickbedded, brownish-gray, very 

sandy; contains white coarse 

calcite crystals ............ 4 8

Sandstone, medium-bedded, 

yellowish-gray, limy, fineto medium-grained ......... 8

Sandstone, medium-bedded, 

light brownish-gray, 

dolomitic, fine- to mediumgrained .................... 10

Sandstone, medium-bedded, 

yellowish-gray, limy, fineto medium-grained ......... 6

Dolomite, medium-bedded, 

brownish-gray, finely 

crystalline................. 6

.Sandstone, medium-bedded, 

light brownish-gray, dolomitic, 

fine- to mediumgrained .................._ 6

Sandstone, medium-bedded, 

yellowish-gray, limy, fineto medium-grained ......... 6

Sandstone, mediumbedded, light brownishgray, dolonritic, fineto mediumgrained .................... 1 0

22
Ft in_ 

Ordovician rocks Continued

Everton formation Continued

Dolomite, thin-bedded, darkgray, sandy, siliceous, 

dense...................... 4

Dolomite, medium-bedded, 

brownish-gray, very sandy, 

finely to mediumcrystalline ................. 1 8

Dolomite, medium-bedded, 

brownish-gray, finely to 

medium-crystalline; contains 

scattered sand grains....... 1 0

Sandstone, thin-bedded, 

yellowish-gray, slightly 

limy, medium-grained; 

grains exhibit secondary 

growth .................... 5

Sandstone, thin- to mediumbedded, light brownishgray, dolomitic, fine- to 

medium-grained............ 10

Covered interval ............. 1 0

Sandstone, medium-bedded, 

yellowish-gray, slightly 

limy, fine- to medium - 

grained; grains exhibit secondary growth................. 2 7

Dolomite, medium-bedded, 

light brownish-gray, sandy, 

finely crystalline; contains 

thin stringers of limy 

sandstone.................. 2 0

Sandstone, medium-bedded, 

yellowish-gray, limy, fineto medium-grained. ........... 1 6

Dolomite, medium-grained, 

brownish-gray, sandy, 

finely crystalline; contains 

stringers of nonsandy dolomite and dolomitic 

sandstone ................ . 2 6

Dolomite, medium-bedded, 

light brownish-gray, finely 

to medium crystalline ...... 1 4

Dolomite, medium-bedded, 

light brownish-gray, finely 

to medium crystalline; 

contains white fine to coarse 

calcite crystals ............ 4 11

Dolomite, thin-bedded, light 

olive-gray to brownish-gray, 

finely to mediumcrystalline................. 1 5

Dolomite, medium-bedded, 

light olive-gray to brownishgray, dense to finely crystalline; contains scattered 

sand grains ................ 2 3

Dolomite, medium-bedded, 

light olive-gray to light 

brownish-gray with streaks 

and spots of dark-gray, 

very finely granular; contains scattered sand 

grains .................... 1 0

Dolomite, medium-bedded, 

light brownish-gray, sandy, 

very finely granular ........ 1 0

Ft i 

Ordovician rocks Continued

Everton formation Continued

Dolomite, mediumbedded, light brownishgray, finely crystalline; 

contains scattered sand 

grains ................. 1 0

Dolomite, medium-bedded, 

light brownish-gray, 

finely crystalline....... 1 0

Dolomite, medium-bedded, 

brownish-gray to darkgray, very finely granular; contains scattered 

sand grains increasing 

in abundance 

downward ............. 2 10

Sandstone, medium-bedded, 

yellowish-gray, dolomitic, medium-grained; 

grains exhibit secondary 

growth ................ 1 0

Dolomite, medium-bedded, 

light olive-gray to light 

brownish-gray, slightly 

limy, finely crystalline; 

contains white coarse 

calcite crystals; scattered 

sand grains in the upper 

4 inches ............... 2 9

Sandstone, medium-bedded, 

yellowish-gray, dolomitic, 

slightly limy, fine- to 

coarse-grained ........ 3 3

Dolomite, medium-bedded, 

brownish-gray, slightly 

limy, finely 

crystalline ............. 10

Sandstone, medium-bedded, 

yellowish-gray, dolomitic, 

slightly limy, fine- to 

coarse-grained ......... 2 11

Sandstone, medium-bedded, 

yellowish-gray to light 

olive-gray, dolomitic, 

slightly limy, mediumgrained ............... 2 10

Dolomite, medium-bedded, 

light brownish-gray, 

slightly limy, mediumcrystalline; contains scattered sand grains....... 1 2

Sandstone, medium-bedded, 

yellowish-gray, dolomitic, 

slightly limy, fine- to 

coarse-grained; contains 

white coarse calcite 

crystals .............. 1 3

Newton sandstone member:

Sandstone, medium-bedded, 

yellowish-gray, slightly 

limy, fine- to coarsegrained ............... 5 0

Sandstone, thin- to mediumbedded, yellowish-gray, 

limy, fine- to coarsegrained ................ 5 0

(Base of Newton sandstone member)

23
Ft in_ 

Ordovician rocks Continued

Everton formation Continued 

Limestone, mediumbedded, medium-gray,

sandy, very finely

granular .................. 1 4

Limestone, medium-bedded,

medium-gray, oolitic, very

finely granular; contains

scattered sand grains........ 2 1

Limestone, medium-bedded,

medium-gray, oolitic,

very finely granular......... 1 6

Sandstone, medium-bedded,

yellowish-gray, very limy, -

fine- to coarse-grained ..... 1 10 

Dolomite, medium-bedded,

yellowish-gray to light

olive-gray, very limy,

finely to mediumcrystalline ................ 2 6

Limestone, medium-bedded,

light-gray, very dolomitic,

slightly sandy, finely to

medium-crystalline; loosely

coiled cephalopods or

gastropods, small ostracods,

and pelecypods(?) .......... 10

Limestone, medium-bedded,

light-gray, very dolomitic,

finely to medium -

crystalline ................ 1 3

Limestone, medium-bedded,

light-gray to light olive -

gray, slightly dolomitic,

finely crystalline ........... 1 3

Sandstone, thin-bedded,

yellowish-gray, limy, fineto medium-grained ......... 2

Limestone, medium-bedded,

light-gray to light olive -

gray, slightly dolomitic,

finely crystalline ........... 1 5

Limestone, medium-bedded,

yellowish-gray, very sandy,

finely crystalline ........... 10

Limestone, thin-bedded,

light olive-gray, oolitoid,

slightly dolomitic, finely

to medium-crystalline ....... 1 5

Sandstone, medium-bedded,

yellowish-gray to light

olive-gray, limy, fineto coarse grained............ 6

Limestone, medium-bedded,

yellowish-gray to light

olive-gray, sandy, finely

crystalline ................ 1 1

Limestone, medium-bedded,

light olive-gray, slightly

dolomitic, very finely

granular to finely

crystalline; we 11-developed

cryptozoon

structures ................ 3 10

Sandstone, medium-bedded,

yellowish-gray, limy,

fine- to mediumgrained ................... 1 4

Ft in_ 

Ordovician rocks Continued

Everton formation Continued

Dolomite, medium-bedded, 

yellowish-gray to light 

brownish-gray, sandy, 

slightly limy, mediumcrystalline ............. 6

Dolomite, medium-bedded, 

yellowish-gray to light 

brownish-gray, slightly 

limy, mediumcrystalline............. 10

Limestone, medium-bedded, 

light-gray, sandy, very 

finely granular......... 1 3

Limestone, medium-bedded, 

yellowish-gray, very sandy, 

very finely granular .... 4 4

Dolomite, medium-bedded, 

brownish-gray, sandy, 

slightly limy, finely 

crystalline; contains 

thin stringers of slightly 

limy, dolomitic 

sandstone .................. 11

Dolomite, thick-bedded, medium 

light gray to light brownishgray, finely to mediumcrystalline; contains scattered 

sand grains ............ 1 5

Dolomite, thick-bedded, 

light brownish-gray, sandy, 

finely crystalline........ 1 0

Dolomite, platy to thinbedded, light olive-gray, 

limy, finely to medium-crystalline; sandy at base; welldeveloped cryptozoon 

structures ............. 3 1

Dolomite, medium-bedded, 

yellowish-gray, very 

sandy, finely to mediumcrystalline ............ 10

Dolomite, medium-bedded, 

yellowish-gray to brownishgray, finely to mediumcrystalline; contains thin 

stringers of sandy 

dolomite .............. 4 1

Sandstone, medium-bedded, 

yellowish-gray, dolomitic, 

fine- to medium-grained; 

contains thin stringers of 

brownish-gray dolomite; 

grains exhibit secondary 

quartz growth........... 3 7

Dolomite, very thin to thinbedded, brownish-gray, 

medium-crystalline..... 1 10

Dolomite, medium-bedded, 

light brownish-gray, slightly 

limy, medium-crystalline; 

contains stringers of sandy 

dolomite .............. 3 9

Dolomite, medium-bedded, 

medium light gray to 

brownish-gray, mediumcrystalline; contains scattered sand grains........ 4 4

24
Ordovician rocks Continued

Everton formation Continued

Dolomite, medium-bedded, 

brownish-gray to olivegray, medium - 

crystalline................. 3

Dolomite, medium-bedded, 

brownish-gray to olive - 

gray, very sandy, mediumcrystalline ................. 1

Dolomite, medium-bedded, 

light brownish-gray to 

brownish-gray, sandy, 

medium-crystalline; contains very sandy dolomite 

stringers in a darker, sandy 

dolomite; sand grains at the 

more sandy beds exhibit 

secondary growth .........

Dolomite, medium-bedded, 

medium-gray to brownishgray, medium-crystalline; 

contains thin, sandy dolomite stringers..............

Dolomite, medium-bedded, 

medium-gray to brownishgray, medium - 

crystalline ................. 3

Sandstone, medium-bedded, 

yellowish-gray, dolomitic, 

fine- to medium-grained. 

The dolomite cement increases 

downward and the unit becomes 

sandy dolomite at the 

base ...................... 1

Dolomite, medium-bedded, 

brownish-gray, mediumcrystalline ................. 2

Dolomite, medium-bedded, 

light brownish-gray, slightly 

limy, medium-crystalline; 

contains scattered sand 

grains .................... 5

Dolomite, medium-bedded, 

light brownish-gray, mediumcrystalline; contains thin 

sandstone stringers and scattered sand grains ........... 5

Dolomite, medium-bedded, light 

brownish-gray, finely to 

medium-crystalline; contains 

thin sandstone stringers and 

scattered sand grains ........ 5

Dolomite, medium-bedded, 

light brownish-gray, finely 

to medium-crystalline; contains scattered sand grains... 4

Dolomite, thin- to mediumbedded, brownish-gray, finely 

to medium-crystalline; contains 

scattered sand grains ....... 3

Dolomite, thin- to mediumbedded, brownish-gray, finely 

to medium-crystalline; contains 

scattered sand grains and thin 

sandstone stringers......... 1

Ft in_ - Ft in 

Ordovician rocks Continued

Everton formation Continued

Dolomite, thin- to mediumbedded, light brownishgray to light olive-gray,

5 finely to medium-crystalline; 

contains thin siliceous sandstone stringers that weather 

out in wavy bands....... 5 0

1 6 Dolomite, medium-bedded,

light olive-gray to brownishgray, medium-crystalline; 

to coarsely crystalline ...... 3 4

Dolomite, thin- to mediumbedded, light brownish-gray to 

to light olive-gray, finely 

to medium-crystalline; contains scattered sand grains

2 10 and thin stringers of sandy

dolomite ................... 5 7

Dolomite, medium-bedded, 

light brownish-gray, finely 

to medium-crystalline; con6 tains thin sandy dolomite 

stringers and scattered 

sand grains................ 5 0

Dolomite, medium- to

5 thick-bedded, light brownishgray, finely to mediumcrystalline; contains thin 

sandy dolomite stringers 

and scattered sand 

grains ..................... 4 10

Sandstone, thin-bedded, white

) to medium light gray,

quartzitic, fine- to medium - 

grained; grains exhibit much

5 secondary growth........... 8

Dolomite, medium- to thickbedded, light olive-gray, 

finely to medium crystalline; 

contains sandy dolomite

) stringers less than 3 inches 

thick and scattered sand 

grains..................... 5 2

Base of section at river level

281 9

H. Section of the St. Peter sandstone and Everton 

formation on the north side of the Buffalo River 

in the SW|SWi sec. 26, T. 16 N. , R. 19 W. , 

Newton County, Ark. Base of section 15 feet 

above river level.

Carboniferous (Mississippian ) rocks: 

Boone formation:

St. Joe limestone member.

Covered interval 1 to top of hill. Contains 

float blocks of chert from the Boone formation and limestone from the St. Joe 

limestone member.

25
Ft in. 

Ordovician rocks:

St. Peter sandstone:

Sandstone, thick-bedded to 

massive, white, fine- to mediumgrained; grains exhibit much 

secondary growth ............... 4 3

Sandstone, medium- to thickbedded, yellowish-gray, fineto medium-grained; grains 

exhibit secondary 

growth.......................... 3 11

Covered interval.................. 58 0

Sandstone, medium- to thickbedded, yellowish-gray to 

white, fine- to medium-grained; 

grains exhibit secondary 

growth ....................... 6 9

72 IT

Everton formation: 

Jasper member:

Dolomite, thin- to mediumbedded, medium-gray to 

brownish-gray, slightly 

silty, finely to mediumcrystalline................. 2 0

Sandstone, thin- to mediumbedded, brownish-gray, very 

dolomitic, fine- to medium - 

grained ................... 1 0

Sandstone, thin- to mediumbedded, yellowish-gray, 

slightly limy, fine- to mediumgrained; grains exhibit 

secondary growth ........... 10

Dolomite, medium- to

thick-bedded, brownish-gray,

very sandy, finely

crystalline................. 3 3

Dolomite, medium-bedded, 

brownish-gray, sandy, finely 

crystalline................. 1 6

Sandstone, medium-bedded, 

yellowish-gray, dolomitic, 

slightly limy, fine- to 

medium-grained............ 6

Dolomite, medium-bedded, 

-brownish-gray, mediumcrystalline ................. 1 7

Sandstone, medium- to thickbedded, yellowish-gray, limy, 

fine- to medium-grained; 

grains exhibit secondary 

growth..................... 2 8

Dolomite (weathers back and 

could not be adequately 

sampled), medium-bedded, 

greenish-gray, silty, finely 

crystalline ................. 1 0

Dolomite, medium-bedded, 

brownish-gray, slightly 

silty, finely to mediumcrystalline ................. 2 3

Dolomite, thin- to mediumbedded, brownish-gray, 

medium-crystalline......... 1 6

Ft in, 

Ordovician rocks Continued

Everton formation Continued 

Jasper member Continued

Dolomite, thin- to mediumbedded, light brownish-gray, 

very finely granular; contains scattered sand grains 

in the lower part ........... 2 0

Sandstone, medium- to thick - 

bedded, yellowish-gray to 

white, limy, dolomitic, fineto medium-grained ......... 1 11

Dolomite, medium-bedded, 

dark-gray to brownish-gray, 

finely to medium-crystalline; 

contains scattered sand 

grains .................... 10

Limestone, thick-bedded, olivegray, sandy, dense to finely 

crystalline; ostracods ....... 1 2

Sandstone, medium-bedded, 

greenish-gray and yellowishgray, limy, fine- to mediumgrained; contains sandy limestone 

concretions 1 to 2 inches in 

diameter .................. 1 1

Limestone, very thin to thinbedded, yellowish-gray to 

olive-gray, sandy, finely 

crystalline................. 1 0

Limestone, very thin to thinbedded, olive-gray, oolitic, 

dense to very finely 

granular................... 2 3

Dolomite, badly weathered, 

very thin to thin-bedded, 

pale-olive to grayish-olive, 

limy, silty, finely 

crystalline................. 1 6

Dolomite, medium-bedded, 

brownish-gray, finely to 

medium-crystalline ........ 3 6

Dolomite, medium-bedded, 

light olive-gray to light 

brownish-gray, slightly 

limy, mediumcrystalline ................. 1 9

Dolomite, medium-bedded, 

light olive ^gray to light 

brownish-gray, slightly limy, 

medium-crystalline ;contains 

scattered sand grains........ 2 0

Dolomite, medium-bedded, 

grayish-orange pink to paleolive, medium-crystalline; 

contains scattered sand 

grains ..................... 2 0

Limestone, medium-bedded, 

olive-gray, oolitic, dense 

to finely crystalline ........ 6

Dolomite, thick-bedded, lightgray to light brownish-gray, 

slightly limy, mediumcrystalline ................. 2 0

Sandstone, medium-bedded, 

yellowish-gray to white, limy, 

very fine to medium-grained; 

grains exhibit secondary 

growth..................... 2 3

26
Ft in_ 

Ordovician rocks Continued

Everton formation Continued 

Jasper member Continued

Sandstone, medium-bedded, 

light brownish-gray, very 

dolomitic, fine- to mediumgrained ................... 6

Limestone, medium-bedded, 

medium-gray to light olive - 

gray, sandy, finely 

crystalline ................ 6

Limestone, medium-bedded, 

medium-gray to light olive - 

gray, oolitic, dense to finely 

crystalline; ostracods....... 1 8

Sandstone, thick-bedded, 

yellowish-gray to white, very 

limy, fine- to mediumgrained .................... 2 9

Limestone, medium-bedded, medium-gray to olive-gray, oolitic, 

dense to finely crystalline.... 1 3

Sandstone, medium- to thickbedded, yellowish-gray to 

white, limy, fine- to mediumgrained .................... 1 7

Sandstone, medium- to 

thick-bedded, yellowish-gray 

to brownish-gray, dolomitic, 

limy, fine- to mediumgrained .................... 1 6

Dolomite, thick-bedded, 

medium-gray to light olive - 

gray, limy, finely to 

medium-crystalline; sandy 

in the upper few 

inches..................... 1 1

Limestone, thin-bedded, olivegray, oolitic, finely 

crystalline ................ 3

Sandstone, medium-bedded, 

yellowish-gray, limy, fine- to 

medium-grained............ 6

(Base of Jasper member)

Sandstone, medium-bedded, 

yellowish-gray, dolomitic, 

fine- to mediumgrained ................... 6

Sandstone, medium-bedded, 

brownish-gray to white, 

dolomitic, fine- to mediumgrained; grains exhibit secondary growth ................. 1 3

Dolomite, medium-bedded, 

dark brownish-gray, sandy, 

finely crystalline; 

ostracods .................. 1 0

Dolomite, very thin to mediumbedded, dark brownish-gray, 

dense to finely crystalline ... 2 3

Dolomite, medium- to 

thick-bedded, brownishgray, very sandy, finely 

crystalline ................ 3 0

Sandstone, medium- to 

thick-bedded, white, dolomitic, slightly limy, fineto medium-grained ......... 1 2

Ft in_ 

Ordovician rocks Continued

Everton formation Continued

Dolomite, thin-bedded, 

brownish-gray, sandy, 

finely crystalline........... 3

Sandstone, medium- to

thick-bedded, light brownishgray, dolomitic, fine- to 

medium-grained ........... 1 7

Dolomite, medium-bedded, 

light brownish-gray, very 

sandy, finely crystalline..... 1 0

Dolomite, medium-bedded, 

medium-gray to brownishgray, sandy, very finely 

granular................. . 6 2

Dolomite, medium-bedded, 

dark brownish-gray, finely 

crystalline ................ 1 0 

Sandstone, thin-bedded, white, 

limy, dolomitic, fine- to 

medium-grained ........... 4

Dolomite, medium-bedded, 

brownish-gray, very sandy, 

dense to finely 

crystalline ................. 3 0

Dolomite, thin- to medium - 

bedded, medium-gray to 

brownish-gray, dense ....... 1 4

Sandstone, medium-bedded, 

yellowish-gray, dolomitic, 

quartzitic, fine- to mediumgrained; grains exhibit 

secondary growth........... 6

Dolomite, thick-bedded, brownishgray, sandy, dense to very 

finely granular ............ 2 4

Dolomite, very thin to thinbedded, brownish-gray, dense 

to very finely granular...... 5

Sandstone, very thin to thinbedded, white, limy, dolomitic, fine- to mediumgrained .................... 3

Dolomite, very thin to thinbedded, brownish-gray, sandy, 

very finely granular........ 4

Dolomite, medium-bedded, 

brownish-gray, sandy, very 

finely granular............. 4 0

Dolomite, medium- to thickbedded, brownish-gray, 

sandy, very finely granular; 

contains thin stringers of 

nonsandy dense dolomite .... 5 3

Dolomite, medium-bedded, 

brownish-gray, sandy, very 

finely granular ........... . 3 7

Sandstone, medium-bedded, 

white, fine- to mediumgrained; grains exhibit 

secondary growth........... 8

Dolomite, medium-bedded, 

brownish-gray to mediumgray, dense to finely 

crystalline; contains 

scattered sand 

grains ..................... 1 10

27
	Ft in B in 

Ordovician rocks Continued Ordovician rocks Continued

Everton formation Continued Everton formation Continued

Sandstone, medium-bedded, Sandstone, medium-bedded, 

light brownish-gray, brownish-gray, limy, dolodolomitic, limy, fine- to mitic, fine- to mediummedium-grained ............ 10 grained...............;.... 2 6

Dolomite, medium-bedded, Dolomite, thick-bedded,

brownish-gray to medium- medium-gray, finely

gray, dense to finely crystal- crystalline ................ 1 6

line; contains scattered sand Sandstone, medium-bedded,

grains ..................... 2 0 light brownish-gray, doloSandstone, thin-bedded, white, mitic, fine- to mediumlimy, fine- to medium-grained; grained .................... 3 4

grains exhibit secondary Dolomite, medium-bedded,

growth .................... 4 brownish-gray, finely

Dolomite, medium-bedded, crystalline ................ 8

brownish-gray, sandy, finely Sandstone, medium-bedded,

crystalline; contains thin light brownish-gray,

stringers of nonsandy very dolomitic, fine- to medium -

finely granular dolomite..... 4 11 .grained ................... 1 0

Dolomite, medium-bedded, Sandstone, medium-bedded,

light brownish-gray, very light brownish-gray, very

sandy, very finely dolomitic, fine-to "mediumgranular................... 1 2 grained; contains thin

Sandstone, medium-bedded, stringers of dolomite........ 4 0

yellowish-gray, limy, dolo- Dolomite, medium-bedded,

mitic, fine- to medium- light brownish-gray,

grained .................... 1 7 slightly limy, finely to

Dolomite, medium-bedded, medium-crystalline; conlight brownish-gray, very tains pinkish-brown finely 

sandy, very finely crystalline calcite.......... 1 0

granular .................. 2 0 Dolomite, medium-bedded,

Sandstone, medium-bedded, brownish-gray, sandy, finely 

brownish-gray to yellowish- to medium-crystalline; congray, dolomitic, fine- to tains thin dolomitic and limy 

medium-grained ............ 1 0 sandstone stringera......... 1 6

Sandstone, medium-bedded, Newton sandstone member:

yellowish-gray, limy, fine- Sandstone, thin- to mediumto medium-grained.......... 6 bedded, yellowish-gray,

Sandstone, medium-bedded, very slightly limy, very

brownish-gray to yellowish- fine to medium-grained;

gray, dolomitic, fine- to grains exhibit secondary

medium-grained............ 7 growth .................... 4 2

Dolomite, thin- to medium- Sandstone, thin- to mediumbedded, light brownish-gray, bedded, yellowish-gray to 

sandy, dense to finely white, limy, fine- to 

crystalline ................. 8 medium-grained; more limy

Dolomite, thin- to medium- at the base................. 4 9

bedded, light brownish- (Base of Newton sandstone member)

gray, dense to finely crystal- Limestone, medium-bedded,

line; contains scattered sand light olive-gray, sandy,

grains..................... 1 4 finely crystalline ........... 2 2

Dolomite, thin-bedded, light Limestone, medium-bedded,

brownish-gray, dense to olive-gray, oolitic, dense

finely crystalline ........... 4 to finely crystalline......... 2 1

Dolomite, medium-bedded, Limestone, medium-bedded,

brownish-gray to medium- light olive-gray, sandy,

gray, medium- finely crystalline............ 8

crystalline.................. 5 0 Sandstone, medium-bedded,

Dolomite, thin- to medium- yellowish-gray to light olivebedded, brownish-gray to gray, limy, fine- to mediummedium-gray, finely to grained ................... 3 0

medium-crystalline; con- Dolomite, medium-bedded,

tains scattered sand brownish-gray, sandy, finely

grains ..................... 4 4 to medium-crystalline ...... 6

Dolomite, medium-bedded, Limestone, medium-bedded,

light brownish-gray to olive- medium-gray, dense to

gray, slightly silty, finely to finely crystalline; contains

medium-crystalline; contains scattered sand

scattered sand grains....... 4 1 grains .................... 11

	28
Ft in_ 

Ordovician rocks Continued

Everton formation Continued

Sandstone, thin-bedded, 

yellowish-gray, limy, 

fine- to mediumgrained ................... 3

Limestone, medium-bedded, 

medium-gray, finely 

crystalline; contains scattered 

sand grains................ 1 9

Limestone, medium-bedded, 

medium-gray to olive-gray, 

finely crystalline; contains 

scattered sand grains ...... 1 0

Sandstone, medium-bedded, 

yellowish-gray, very limy, 

fine- to medium-grained..... 9

Limestone, medium-bedded, 

medium-gray to olive-gray, 

finely crystalline; contains 

scattered sand grains ...... 1 2

Sandstone, medium-bedded 

yellowish-gray, very limy, 

fine- to mediumgrained .................... 11

Limestone, thin- to mediumbedded, olive-gray, oolitoid, 

finely to medium 

crystalline................. 1 0

Limestone, thin-bedded, olive - 

gray, sandy, finely to 

medium crystalline ........ 4

Sandstone, thin- to mediumbedded, white, limy, fine- to 

medium-grained ......... . 6

Limestone, thin- to mediumbedded, olive-gray, oolitoid, 

finely crystalline; 

ostracods ................. 1 9

Sandstone, thin- to mediumbedded, light-gray, limy, 

fine- to mediumgrained ................... 5

Limestone, medium- to thickbedded, oolitoid, dense to 

finely crystalline; cryptozoon 

structures.................. 2 7

Sandstone, medium-bedded, 

yellowish-gray to white, 

limy, fine- to mediumgrained ................... 1 10

Limestone, medium-bedded, 

olive-gray, sandy, slightly 

oolitoid, finely 

crystalline................. 9

Sandstone, medium- to thickbedded, yellowish-gray, very 

limy, fine- to mediumgrained ................... 1 4

Limestone, medium-bedded, 

olive-gray, sandy, dense to 

finely crystalline........... 8

Sandstone, medium- to thickbedded, yellowish-gray, very 

limy, fine- to mediumgrained ................... 2 2

Sandstone, thick-bedded, 

light brownish-gray, very 

dolomitic, fine- to mediumgrained; contains thin stringers 

of dolomite............... . 1 10

Ft in_ 

Ordovician rocks Continued

Everton formation Continued

Dolomite, medium-bedded

brownish-gray, dense ....... 9

Dolomite, medium-bedded, 

brownish-gray, sandy, finely 

crystalline ................ 2 0

Chert, medium-bedded, 

brownish-gray, oolitic, dense 

(porous where weathered .... 5

Sandstone, medium-bedded, 

yellowish-gray, limy, fineto medium-grained ......... 5

Limestone, medium-bedded, 

olive-gray, dense to finely 

crystalline; cryptozoon 

structures ............... . 1 11

Dolomite, medium-bedded, 

light brownish-gray, limy, 

sandy, finely crystalline .... 10

Limestone, medium- to thickbedded, medium-gray, 

dense to finely crystalline; 

cryptozoon structures....... 1 5

Dolomite, medium- to 

thick-bedded, brownishgray, sandy, silty, limy, 

finely crystalline ........... 2 0

Dolomite, thin-bedded, 

yellowish-gray to light 

brownish-gray, mediumcrystalline ................ 3

Sandstone, medium-bedded, 

yellowish-gray, very 

dolomitic, fine- to mediumgrained ................. . 3 0

Limestone, medium- to 

thick-bedded, mediumgray to olive-gray, oolitoid, 

dense to finely crystalline; 

cryptozoon structures ....... 3 0

Limestone, medium-bedded, 

olive-gray, oolitic, dense to 

finely crystalline ......... . 1 6

Sandstone, medium-bedded, 

yellowish-gray, limy, fine- to 

medium-grained............ 6

Limestone, medium-bedded, 

light olive-gray, sandy, 

finely crystalline........... 1 6

Limestone, very thin to 

medium-bedded, mediumgray, dense ............... 1 1

Limestone, thin- to mediumbedded, yellowish-gray, 

very sandy, finely 

crystalline................. 10

Limestone, thin- to mediumbedded, light olive-gray, 

doiomitic (especially in the 

lower 6 inches), finely 

crystalline ................ 2 9

Sandstone, thin- to mediumbedded, light-gray to 

yellowish-gray, dolomitic, 

limy, fine- to mediumgrained .................. . 1 0

Limestone, thin- to mediumbedded, olive-gray, oolitoid, 

slightly dolomitic, dense to 

finely crystalline............ 1 7

29
Ft in 

Ordovician rocks Continued 

Everton formation Continued

Sandstone, thin- to medium - 

bedded, light-gray to white, 

very limy, fine- to 

medium-grained............ 1 11

Limestone, thin-bedded, 

light olive-gray, very sandy, 

finely crystalline ........... 3

Sandstone, thin- to mediumbedded, light-gray, very 

limy, fine- to mediumgrained .................... 8

Limestone, thin-bedded, light 

olive-gray, very sandy, 

finely crystalline ............ 4

Limestone, medium-bedded, 

olive-gray, dense to finely 

crystalline; cryptozoon 

structures.................. 2 11

Limestone, thin-bedded, 

light-gray, very sandy, 

finely crystalline; contains 

limestone granules.......... 2

Limestone, thin-bedded, 

olive-gray, dense to finely 

crystalline ................. 3

Limestone, thin- to mediumbedded, olive-gray, dense 

to finely crystalline; contains streaks of sandy 

dolomitic limestone......... 4 6

Limestone, thin- to mediumbedded, light olive-gray, 

oolitic, dense to finely 

crystalline; contains thin 

sand stringers; cryptozoon 

structures in the upper 

18 inches .................. 5 2

Limestone, platy to medium - 

bedded, light olive-gray, 

dense to finely crystalline; 

contains scattered sand 

grains and sandy limestone 

stringers .................. 4 9

Limestone, thin- to mediumbedded, olive-gray, oolitoid, 

dense to finely 

crystalline ................ 4 4

Limestone, platy to thinbedded, olive-gray, oolitoid, 

slightly dolomitic, dense to 

finely crystalline ........... 4 2

Sandstone, thin-bedded, lightgray, slightly limy, quartzitic; grains exhibit secondary 

growth .................... 7

Limestone, thickbedded, olive-gray 

to medium-gray, 

oolitoid, dolomitic, 

dense to mediumcrystalline ................. 1 5

Sandstone, thinbedded, light brownishgray to white, slightly 

dolomitic, quartzitic, 

fine- to mediumgrained; grains exhibit 

much secondary 

growth .................... 8

Ft in_ 

Ordovician rocks Continued

Everton formation Continued

Dolomite, medium-bedded, 

light brownish-gray, limy, 

fine- to medium-crystalline; 

contains scattered sand 

grains; cryptozoon 

structures.................. 3 9

Limestone, light olive-gray, 

slightly dolomitic, dense to 

finely crystalline; cryptozoon 

structures................. 8

Dolomite, platy to very thin 

bedded, light brownishgray, finely to mediumcrystalline ................. 2 11

Dolomite, very thin to mediumbedded, medium light gray, 

finely to medium-crystalline; 

contains scattered sand 

grains ..................... 3 7

Dolomite, medium- to thickbedded, finely to mediumcrystalline; contains scattered 

sand grains................. 1 8

Sandstone, medium-bedded, 

medium light gray, very dolomitic, fine- to mediumgrained .................... 6

Dolomite, medium- to thickbedded, medium-gray, finely 

to medium-crystalline; contains scattered sand 

grains ..................... 2 6

Dolomite, medium- to thickbedded, light brownish-gray, 

very sandy, finely crystalline; 

contains thin stringers of 

dolomitic sandstone ........ 1 5

Dolomite, platy to thin-bedded, 

medium-gray, finely to mediumcrystalline; contains scattered 

sand grains................. 2 10

Sandstone, thin-bedded, lightgray to white, dolomitic, 

quartzitic, fine- to mediumgrained; grains exhibit much 

secondary growth........... 5

Dolomite, platy to thin-bedded, 

medium-gray, finely to 

medium-crystalline; contains 

scattered sand grains ...... 8

Dolomite, thin- to mediumbedded, light olive-gray, 

medium-crystalline; contains 

scattered sand grains ...... 4 1

Dolomite, thin-bedded, lightgray, very sandy, finely 

crystalline................. 3

Sandstone, thin-bedded, 

yellowish-gray, quartzitic, 

slightly dolomitic, fine- to 

medium-grained; grains 

exhibit secondary growth; 

ostracods( ?) fragments ...... 1 2

Dolomite, thin- to mediumbedded, light brownishgray, finely to mediumcrystalline; contains scattered 

sand grains................ 4 3

30
Ft in_ 

Ordovician rocks Continued

Everton formation Continued

Dolomite, very thin to medium - 

bedded, medium light gray, 

finely to medium-crystalline; 

cryptozoon( ?) structures..... 1 2

Dolomite, medium-bedded, 

light brownish-gray, finely 

to medium-crystalline; contains scattered sand 

grains .................... 1 8

Sandstone, medium-bedded, 

light-gray, dolomitic, fineto medium-grained; grains 

exhibit secondary 

growth ................... 6

Sandstone, thin- to mediumbedded, light-gray, slightly 

dolomitic, fine- to mediumgrained; grains exhibit 

secondary growth........... 1 0

Dolomite, thin- to mediumbedded, medium light gray, 

finely to medium-crystalline; 

contains scattered sand 

grains .................... 6

Dolomite, thin- to mediumbedded, medium light gray, 

finely to mediumcrystalline.................. 2 8

Dolomite, thin- to mediumbedded, medium light gray, 

finely to medium-crystalline; 

contains scattered sand 

grains ..................... 6

Dolomite, thin- to mediumbedded, light brownish-gray, 

finely to medium-crystalline; 

contains scattered sand 

grains ..................... 4 6

Chert, thin-bedded, white, 

dense (tripolitic in part) ..... 3

Dolomite, thin-bedded, light 

brownish-gray, finely to 

medium-crystalline; contains scattered sand 

grains ..................... 3

Sandstone, thin- to mediumbedded, white to light-gray, 

quartzitic, slightly dolomitic, fine- to mediumgrained; grains exhibit 

secondary growth........... 1 6

Dolomite, thin- to mediumbedded, light brownishgray, finely to mediumcrystalline; contains scattered 

sand grains ................ 3 9

Sandstone, thin-bedded, light - 

gray to light brownish-gray, 

dolomitic, fine- to mediumgrained; grains exhibit secondary growth................. 1 1

Dolomite, thin- to mediumbedded, brownish-gray, finely 

crystalline................. 3 10

Dolomite, very thin to mediumbedded, light brownishgray, finely to mediumcrystalline ................ 1 0

Ft in_ 

Ordovician rocks Continued

Everton formation Continued

Dolomite, very thin to 

medium-bedded, light 

brownish-gray, sandy, 

finely to mediumcrystalline................. 2 6

Dolomite, very thin to mediumbedded, light brownish-gray, 

finely to mediumcrystalline................. 6

Dolomite, very thin to mediumbedded, light brownish-gray, 

finely to medium-crystalline; 

contains scattered sand 

grains .................... 6

Dolomite, thin- to mediumbedded, light brownish-gray, 

finely to mediumcrystalline................. 1 9

Chert, medium-bedded,

yellowish-gray, dense....... 6

Dolomite, thin- to mediumbedded, light brownish-gray, 

finely to mediumcrystalline................. 1 9

Dolomite, medium-bedded, 

light brownish-gray, finely 

to medium-crystalline; contains beds and stringers of 

light brownish-gray oolitic 

chert ..................... 4 1

Dolomite, thin-bedded, light 

 brownish-gray, finely to

medium-crystalline; contains

yellowish-gray oolitic dense

chert in the upper 1 inch and

lower 6 inches.............. 3 7

Dolomite, thin- to mediumbedded, light brownish-gray, 

medium-crystalline; contains 

yellowish-gray dense and white 

tripolitic chert lenses ....... 2 0

Dolomite, thin- to medium-bedded, 

bedded, brownish-gray, finely 

finely to mediumcrystalline................. 1 11

Dolomite, medium- to thickbedded, brownish-gray, 

finely to mediumcrystalline................. 4 4

Sandstone, medium-bedded, 

light brownish-gray, slightly 

dolomitic, quartzitic, fineto medium-grained; grains 

exhibit secondary 

growth .................... 1 6

Dolomite, medium-bedded, 

medium-gray, finely to 

medium-crystalline......... 2 10

Covered interval .............. 2 0

Sandstone, medium-bedded, 

light brownish-gray to 

white, dolomitic, quartzitic, 

fine- to medium-grained; 

grains exhibit secondary 

growth ..................... 6 6

Dolomite, medium-bedded, 

brownish-gray, finely to 

medium-crystalline ......... 3 7

31
Ft in_ 

Ordovician rocks Continued

Everton formation Continued

Dolomite, medium-bedded, 

brownish-gray, finely to 

medium-crystalline......... 3 3

Dolomite, medium-bedded, 

brownish-gray, sandy, finely 

to medium-crystalline ...... 6

Sandstone, thin-bedded, light 

brownish-gray, quartzitic, 

fine- to mediumgrained. ................... 3

Dolomite, mediumbedded, brownish-gray, 

finely to medium-crystalline; 

contains scattered sand 

grains..................... 2 2

Dolomite, mediumbedded, brownish-gray, 

sandy, finely to mediumcrystalline ................. 8

Dolomite, mediumbedded, brownish-gray, finely 

to medium-crystalline; contains scattered sand 

grains ..................... 8

Dolomite, thick-bedded, 

brownish-gray, finely to 

medium-crystalline; contains scattered sand 

grains..................... 6

Dolomite, thick-bedded, 

brownish-gray, finely to 

medium-crystalline .......... 3 9

Dolomite, thin- to mediumbedded, medium-gray to 

light brownish-gray, finely 

crystalline ................ 2 6

Base of section 15 feet above river level.

350 10

I. Section of the lower part of the St. Peter sandstone 

and the upper part of the Everton formation in the 

NEiSWisec. 26, T. 16 N. ,R. , 19 W. , Newton County, 

Ark. The bottom of the section is at the base of 

a small waterfall at an approximate altitude of 

1,000 feet.

Covered interval to top of hill . Represents 

most of the St. Peter sandstone'interval 

and probably the Plattin limestone.

Crdovician rocks:

St. Peter sandstone (lower part only): 

Sandstone, thin- to mediumbedded, yellowish-gray, fineto medium-grained ...........

Ft in

6 0

Everton formation (upper part only): 

Jasper member:

Dolomite, medium-bedded, brownishgray to olive-gray, silty (?), finely 

to medium-crystalline; contains 

scattered sand grains; upper 1 foot 

is slightly more sandy and 

silty ...................... 5 3

Ft _in 

Ordovician rocks Continued

Everton formation Continued 

Jasper member Continued

Dolomite, medium-bedded, 

brownish-gray to darkgray, medium-crystalline; 

contains scattered sand 

grains .................... 5 0

Sandstbne, medium-bedded, 

yellowish-gray to light 

brownish-gray, dolomitic, 

slightly silty and limy, fineto medium-grained ......... 1 1

Dolomite, thin-bedded, 

medium-gray to brownishgray, mediumcrystalline ................ 2 10

Sandstone, thin-bedded, 

yellowish-gray, limy, fineto medium-grained.......... 2 7

Covered interval ............. 1 8

Dolomite, thin- to mediumbedded, light olive-gray 

to light brownish-gray, 

finely to medium-crystalline; 

contains scattered sand 

grains ..................... 2 6

Dolomite, thin- to mediumbedded, light brownish-gray, 

very finely granular; contains scattered sand 

grains..................... 1 2

Sandstone, thin-bedded, 

yellowish-gray to light 

brownish-gray, dolomitic, 

slightly limy, fine- to mediumgrained ................... 8

Sandstone, thick-bedded, 

yellowish-gray, limy, fineto medium-grained; contains coarse white calcite « 

crystals ................... 1 10

Covered interval ............. 1 0

Dolomite, medium- to 

thick-bedded, mediumgray to brownish-gray, 

finely to medium-crystalline; 

contains scattered sand 

graina..................... 1 11

Dolomite, mediumbedded, light-gray to light 

brownish-gray, limy, sandy, 

medium-crystalline ........ 1 0

Sandstone, medium-bedded, 

light-gray to yellowish-gray, 

limy, dolomitic, fine- to 

medium-grained ........... 1 2

Dolomite, very thin bedded, 

yellowish-gray, limy, 

medium-crystalline ........ 2

Sandstone, medium-bedded, 

yellowish-gray to lightgray, very limy, fine- to 

medium-grained ............ 2 4

Limestone, thin-bedded, 

light olive-gray, oolitic, 

dense...................... 11

Dolomite, thin-bedded, lightgray to light brownish-gray, 

limy, medium-crystalline ... 3

32
Ft in 

Ordovician rocks Continued

Everton formation (upper part only) Con. 

Jasper formation Continued

Dolomite, thin-bedded, 

medium-gray to brownishgray, finely crystalline; 

contains some white coarse 

calcite crystals ............ 1 2

Covered interval.............. 7

Dolomite, medium- to 

thick-bedded, medium-gray 

to brownish-gray, finely 

crystalline................. 5 11

Limestone, thin-bedded, 

light olive-gray, dense to 

finely crystalline; contains scattered sand 

grains; ostracods .......... 1 3

Limestone, thick-bedded, 

light olive-gray, oolitic, 

dense to finely crystalline; 

ostracods.................. 1 9

Dolomite, medium-bedded, 

medium-gray, very limy, 

finely to medium-crystalline; 

contains scattered sand 

grains..................... 10

Dolomite, thin- to mediumbedded, light-gray to light 

brownish-gray, limy, finely 

to medium-crystalline; contains scattered sand 

grains..................... 1 6

Limestone, medium-bedded, 

light olive-gray, oolitoid, 

dense to finely 

crystalline ................ 1 0

Dolomite, thin- to mediumbedded, light brownishgray, finely to mediumcrystalline; contains 

scattered sand grains ....... 1 1

Dolomite, medium-bedded, 

very light gray to yellowishgray, very limy, finely to 

medium-crystalline ........ 1 7

Sandstone, medium-bedded, 

light-gray to light brownishgray, limy, dolomitic, fineto medium-grained ......... 2 7

Limestone, thin- to mediumbedded, light olive-gray, 

dense to finely crystalline; 

many ostracods. This bed 

pinches out in a short 

distance .................. 1 0

Limestone, thin- to mediumbedded, light olive-gray, 

dense to finely crystalline; 

many ostracods ............. 1 1

Sandstone, thin- to mediumbedded, very light gray to 

white, very limy, fine- to 

medium-grained ............ 2 8

Limestone, thin- to mediumbedded, medium-gray to 

olive-gray, oolitic, dense 

to finely crystalline ........ 1 7

Ft in

 Con.

Ordovician rocks Continued

Everton formation (upper part only) 

Jasper formation Continued

Sandstone, thin- to mediumbedded, yellowish-gray, limy, 

fine -grained ............... 3 0

Limestone, discontinuous, 

thin-bedded, olive-gray, 

oolitic, dense to finely 

crystalline; contains scattered sand grains. .......... 4

Sandstone, thin-bedded, 

yellowish-gray to white, 

limy, fine-grained; lower half 

of unit is quartzitic.......... 1 0

(Base of Jasper member)

Dolomite, medium-bedded,

light brownish-gray to mediumgray, very sandy, dense 

to finely crystalline; 

ostracods ................. 1 11

Dolomite, thin- to mediumbedded, medium-gray to 

brownish-gray, dense to finely 

crystalline; contains scattered 

sand grains................ 1 0

Dolomite, thin- to mediumbedded, brownish-gray, 

sandy, dense to finely 

crystalline; ostracods ....... 8

Dolomite, thin- to medium - 

bedded, brownish-gray, 

dense to finely crystalline; 

contains scattered sand 

grains ..................... 10

Dolomite, thin- to mediumbedded, medium-gray, dense 

to finely crystalline; contains scattered, sand grains 

and sandy dolomite 

stringers .................. 1 5

Sandstone, thin- to mediumbedded, yellowish-gray to 

white (stained brown in spots), 

fine- to medium-grained; 

grains exhibit much secondary 

growth ..................... 8

Bottom of section at base of small waterfall.

J. Section of the St. Peter sandstone and Everton 

formation on the east side of the Buffalo River 

about i mile downstream from Mount Hersey 

in the SE|SWl sec. 25, T. 16 N. , R. 19 W., 

Newton County, Ark. Base of section 65 feet 

above river level.

Ordovician rocks:

Plattin limestone:

Cohered interval. (The contact 

between the Plattin limestone 

and the St. Peter sandstone 

is present in this interval.)

Ft in

21

33
Ft in. Ft in.

Ordovician rocks Continued 

St. Peter sandstone:

Sandstone, medium- to 

thick-bedded, light-gray and 

brownish-gray, medium- to 

coarse-grained; grains exhibit 

secondary growth .............. 5

Sandstone, medium- to thickbedded, white and gray banded, 

slightly limy, medium- and 

coarse-grained; grains exhibit 

secondary growth ............... 5

Sandstone, medium-bedded, lightgray to white, limy, mediumgrained; grains exhibit secondary 

growth; irregular basal surfacebasal beds appear to fill hollows 

in underlying limestone.........

Everton formation: 

Jasper member:

Limestone, medium-bedded, 

light-gray, oolitic, dense 

to finely crystalline; contains scattered sand 

grains ................... .

Sandstone, thin-bedded, white, 

very limy, medium-grained 

grained....................

Limestone, thin- to mediumbedded, light-gray and light 

pinkish-gray, oolitic, dense 

to finely crystalline; contains 

scattered sand grains ..... .

Sandstone, medium-bedded, 

white, very limy, mediumto fine-grained; basal part 

contains small flat limestone 

pebbles .................. .

Limestone, light-gray, oolitic, 

dense to finely crystalline; 

contains scattered sand 

grains......................

Limestone, light-gray to 

white, sandy, dense to finely 

crystalline.................

Sandstone, light-gray to white, 

very limy, fine- to mediumgrained .................. .

Covered interval ............ .

Limestone, medium-bedded, 

light-gray, dense to finely 

crystalline; contains small 

flat, greenish-gray silty 

and sandy limestone pebbles; 

pelecypod fragments and 

gastropods................ .

Limestone, medium - 

bedded, light-gray, 

and light olive-gray, 

oolitic, dense to finely 

crystalline; upper 2 inches 

sandy and contains small 

flat oolitic limestone 

pebbles.................. .

Covered interval ............ .

10

5

Ordovician rocks Continued

Everton formation Continued 

Jasper member Continued

Limestone, medium-bedded, 

light olive-gray, oolitic, 

dense to finely crystalline; 

contains scattered sand grains 

and greenish silty patches; 

pelecypod fragments, ostracods, 

and gastropods ............. 2

Limestone, platy to thinbedded, light olive-gray and 

light-gray, dense to finely 

crystalline; contains silty 

partings between the beds; 

sandy in the lower 

2 inches ................... 1

Sandstone, medium-bedded, 

very light gray to white, 

limy, fine-grained.......... 1

Limestone, medium-bedded, 

light olive-gray and lightgray, oolitic, dense; contains scattered sand grains, 

greenish silty patches, and 

limonite; upper 3 inches is 

sandy, contains 

ostracods ..........'...... . 1

Limestone, medium-bedded, 

light brownish-gray and 

light olive-gray, oolitic, 

finely crystalline; upper part 

contains scattered sand grains; 

lower part is sandy, contains 

ostracods ................. 1

Sandstone, thin- to mediumbedded, very light gray to 

white, medium-grained; containa scattered coarse grains; 

grains exhibit secondary 

growth ................... .

Limestone, medium-bedded, 

light-gray to very light gray, 

sandy, oolitic, dense to finely 

crystalline; ostracods in upper 

1 foot 2 inches; lower 7 inches 

contains only scattered sand 

grains .................... 1

Sandstone, medium-bedded, 

very light gray to white, very 

limy, fine- to mediumgrained .................. . 1

Limestone, thin-bedded, 

light-gray and light brownishgray, sandy; grades downward 

into a limy sandstone....... 1

Limestone, medium-bedded, light 

bluish-gray, slightly oolitic, dense 

to finely granular; contains scat-. 

tered sand grains .......... 2

Sandstone, medium-bedded, 

yellowish-gray, limy, fineto medium-grained........ .

Limestone, medium-bedded, 

medium light gray to very 

light gray, oolitic, dense 

to medium-crystalline; contains greenish-gray silt partings 

and limonite; ostracods...... 2

34
Ft in_

Ordovician rocks Continued 

Everton formation Continued 

Jasper member Continued

Limestone, medium- to thickbedded, light brownishgray to very light gray, 

oolitic, dense to finely 

crystalline; contains finely 

to medium-crystalline calcite; 

ostracods .................. 3 4

Limestone, medium-bedded, 

medium-gray to light-gray, 

light olive-gray, oolitoid, 

dense to finely crystalline; 

contains scattered sand 

grains; ostracods............ 3 0

Limestone, medium-bedded, 

light-gray to very light 

gray, finely crystalline; 

contains scattered sand 

grains and stringers 

of sandy limestone; 

ostracods ................. 4 0

Limestone, medium-bedded, 

light-gray and light brownish - 

gray, oolitic, dense to finely 

crystalline; contains scattered 

sand grains................. 2 5

Sandstone, thin-bedded, lightgray, medium-grained; grains 

exhibit secondary growth..... 2 3

Limestone, medium-bedded, 

light brownish-gray and 

olive-gray, oolitic, finely 

to medium-crystalline; contains scattered sand grains; 

ostracods .................. 2 0

Sandstone, medium-bedded, 

yellowish-gray, limy, fineto medium-grained; lime 

cement increases 

upward .................... 2 9

Limestone, medium-bedded, 

very light gray to yellowishgray, oolitoid, finely to 

medium -crystalline; 

ostracods .................. 11

Sandstone, thick-bedded, 

yellowish-gray, very limy, 

fine- to medium-grained .... 3 3 

(Base of Jasper member)

Dolomite, medium-bedded, 

gray, dense to finely 

crystalline; Very sandy in 

upper 1 inch and lower 

3 inches. (This bed pinches 

out 150 feet to the west.) .... I 5

Sandstone, thin- to mediumbedded, light-gray, slightly 

limy, quartzitic, mediumgrained; grains exhibit secondary growth................. 1 9

Sandstone, medium-bedded, 

light-gray and grayish-brown, 

dolomitic, fine- to mediumgrained; contains stringers 

of gray dense dolomita ...... 5 4

Sandstone, medium-bedded, 

light brownish-gray, fine- to 

medium-grained ........... 6

Ft in_ 

Crdovician rocks -Continued

Everton formation -Continued

Sandstone, mediumbedded, light brownishgray, dolomitic, 

fine- to mediumgrained.................... 1 10

Dolomite, medium-bedded, 

brownish-gray, finely to 

medium-crystalline; contains scattered sand 

grains...................... 7

Sandstone, medium-bedded, 

light-gray to brownish - 

gray, dolomitic, mediumgrained .................... 3 2

Dolomite, medium-bedded, 

light-gray and grayish-brown, 

sandy, finely crystalline; sand 

content increases 

downward .................. 1 10

Sandstone, medium-bedded, 

gray-brown, dolomitic, fineto medium-grained ......... 1 11

Dolomite, medium-bedded, 

gray-brown, sandy, dense to 

finely crystalline............ 6

Dolomite, medium-bedded, graybrown, dense to finely 

crystalline; contains white 

calcite crystals ............. 11

Sandstone, medium-bedded, 

very light gray to white, 

limy, medium-grained....... 10

Dolomite, medium-bedded, 

dark brownish-gray, finely 

to medium-crystalline; contains scattered sand 

grains..................... 1' 1

Sandstone, medium-bedded, 

very light gray, fine- to 

medium-grained; secondary 

growth .................... 7

Sandstone, medium-bedded, 

brownish-gray, dolomitic, 

medium-grained ............ 2 7

Dolomite, medium-bedded, 

brownish-gray, dense to 

finely crystalline; contains 

coarse calcite crystals...... 11

Dolomite, medium-bedded, 

light brownish-gray, 

sandy, finely crystalline; contains stringers 

of very light gray to 

white limy sandstone 

and brownish-gray 

dense dolomite ............ 5 2

Dolomite, medium-bedded, 

light brownish-gray, 

limy, finely to mediumcrystalline ................ 1 6

Dolomite, medium-bedded, 

brownish-gray, sandy, 

dense to finely crystalline; 

contains stringers of 

dense dolomite and 

medium-grained 

sandstone ................. 4 3

35
Ft in_ 

Crdovician rocks Continued

Everton formation Continued

Dolomite, medium-bedded, 

light brownish-gray to 

brownish-gray, sandy, 

dense to finely crystalline; contains stringers 

of nonsandy dolomite with 

coarsely crystalline 

calcite .................... 5 0

Dolomite, thin- to mediumbedded, light brownish - 

gray to pale-brown, very 

sandy, dense to finely 

crystalline ................. 2 6

Dolomite, thin- to mediumbedded, brownish-black, 

finely to medium-crystalline; 

contains scattered sand 

grains ..................... 1 1

Sandstone, thin-bedded, 

light-gray to yellowishgray, limy, fine- to 

medium-grained; grains 

exhibit secondary 

growth..................... 6

Dolomite, thin- to medium - 

bedded, light brownishgray to pale-brown, very 

sandy, dense to finely 

crystalline................. 1 0

Dolomite, thin- to medium - 

bedded, light olive-gray, 

sandy, finely crystalline; 

contains stringers of nonsandy 

dolomite................... 2 11

Sandstone, thin-bedded, white, 

limy, fine- to mediumgrained; grains exhibit 

secondary growth ........... 3

Dolomite, thin- to mediumbedded, medium-gray to 

brownish-gray, sandy, finely 

crystalline; sand content 

decreases downward ........ 1 11

Sandstone, medium-bedded, 

yellowish-gray to white, 

dolomitic, .medium-grained; 

grains exhibit secondary 

growth..................... 2 0

Sandstone, medium-bedded, 

light brownish-gray, dolomitic, medium-grained ..... 3 5

Dolomite, thin-bedded, light-gray, 

dense to finely crystalline; contains coarse calcite crystals.. 5

Dolomite, thin-bedded, lightgray, sandy, dense to finely 

crystalline; sand content decreases downward .......... 1 4

Dolomite, medium-bedded, 

light-gray to gray, very 

finely granular to finely 

crystalline; contains mediumcrystalline calcite .......... 5 7

Dolomite, medium-bedded, 

light-gray and light olive - 

gray, very finely granular 

to finely crystalline; contains 

coarsely crystalline calcite.... 4 10

Ft in_ 

Crdovician rocks Continued

Everton formation Continued

Dolomite, medium-bedded, 

light brownish-gray, finely 

crystalline; contains coarse 

calcite crystals ............ 3 3

Dolomite, medium-bedded,

very dark gray, dense ...... 1 0

Dolomite, medium-bedded, 

dark-gray to gray, sandy, 

finely crystalline dolomite; 

contains scattered sand 

grains and thin sandy dolomite stringers ............. 6

Sandstone, medium-bedded, 

light brownish-gray, dolomitic, medium-grained...... 1 3

Sandstone, medium-bedded, 

very light gray, limy, fineto medium-grained; grains 

exhibit secondary 

growth..................... 2 0

Dolomite, medium-bedded, 

brownish-gray, finely crystalline; contains coarse calcite 

crystals ................... 8

Sandstone, medium -bedded, 

light-gray, dolomitic, 

medium-grained; grains 

exhibit secondary 

growth .................... 1 0

Sandstone, medium-bedded, 

light-gray to very light 

gray, limy, fine- to mediumgrained; grains exhibit secondary growth................. 2 0

Sandstone, medium-bedded, 

light-gray to very light gray, 

dolomitic, fine- to mediumgrained.................... 3 0

Sandstone, medium-bedded, 

very light gray to light-gray, 

dolomitic, slightly limy, fineto medium-grained ......... 4 6

Newton sandstone member:

Sandstone, medium-bedded, very 

light gray to white, limy, 

slightly dolomitic; fine- to 

medium-grained; grains 

exhibit secondary 

growth..................... 3 11

Sandstone, medium-bedded, 

very light gray to white, 

slightly limy, fine- to 

medium-grained; grains 

exhibit secondary 

growth..................... 4 9

(Base of Newton sandstone member)

Dolomite, medium-bedded, 

light brownish-gray, very 

sandy, finely granular to 

finely crystalline ........... 2 6

Dolomite, medium-bedded, 

light-gray and light brownishgray, very sandy, finely to 

medium crystalline.......... 2 3

Dolomite, medium-bedded, 

brownish-gray, finely 

granular to finely 

crystalline................. 6

36
Ft in

Ordovician rocks Continued

Everton formation Continued

Sandstone, medium - 

bedded, light-gray to 

white, medium-grained; 

contains calcite 

crystals................... 2

Dolomite, medium-bedded, 

medium light gray, sandy, 

finely to medium-crystalline; 

contains calcite 

crystals................... 3

Dolomite, medium-bedded, 

medium light gray, limy, 

finely to medium - 

crystalline ................. 1

Dolomite, medium-bedded, 

light-gray to brownishgray, sandy, limy, finely 

to medium-crystalline ....... 5

Dolomite, medium-bedded, 

light-gray, slightly limy, 

finely to medium-crystalline; 

contains sandy dolomite beds 

as much as 1 foot 

thick...................... 5

Dolomite, medium- to thickbedded, light-gray to gray, 

finely to medium-crystalline; 

contains sandy dolomite beds 

as much as 1 foot 

thick ...................... 5

Dolomite, medium-bedded, 

light-gray to light olive - 

gray, limy, finely to 

medium-crystalline; contains a sandy dolomite bed 

1 foot thick slightly above 

the middle ................. 4

Dolomite, medium-bedded, 

light brownish-gray to gray, 

sandy, finely to mediumcrystalline; nonsandy in 

upper 1 foot................ 4

Dolomite, medium-bedded, 

light-gray to light brownishgray, sandy, finely to 

medium-crystalline......... 5

Dolomite, thin- to mediumbedded, light-gray and 

light brownish-gray, sandy, 

finely to medium-crystalline; 

nonsandy in lower 

1 foot...................... 4

Dolomite, medium-bedded, 

light-gray and light brownishgray, very sandy in part, 

finely to mediumcrystalline ................. 5

Sandstone, medium- to 

thick-bedded, lightgray to light brownishgray, dolomitic, slightly 

limy, mediumgrained ................... 2

Dolomite, thin-bedded, light 

brownish-gray, finely to 

medium-crystalline.........

Ft 

Crdovician rocks Continued

Everton formation Continued

Sandstone, medium- to 

thick-bedded, lightgray to light brownishgray, dolomitic, slightly 

limy, medium-grained ...... 2

Dolomite, very thin to mediumbedded, light-gray to brownishgray, sandy, finely to mediumcrystalline; sand content 

increases upward ......... 3

Dolomite, thin- to mediumbedded, light-gray, finely 

to medium-crystalline; contains scattered sand 

grains .................... 5

Dolomite, medium-bedded, 

light-gray, finely to 

medium-crystalline; contains 

scattered sand 

grains .................... 15

Sandstone, very thin bedded, 

light-gray to light olive - 

gray, dolomitic, fine- to 

medium-grained .......... .

Dolomite, medium-bedded, 

light-gray to light olive-gray, 

finely to medium-crystalline; 

contains scattered sand grains, 

wavy bedding; cryptozoon(?) 

structures ................. 4

Dolomite, medium-bedded, 

light brownish-gray, finely 

to medium-crystalline; contains a silty bed 18 inches 

from top .................. 4

Dolomite, very thin to mediumbedded, brownish-gray, finely 

to medium-crystalline....... 2

Sandstone, very thin to mediumbedded, brownish-gray, dolomitic, medium-grained ..... 1

Dolomite, very thin to

medium-bedded, brownishgray, finely to mediumcrystalline; contains 

scattered sand 

grains ..................... 1

Dolomite, mediumbedded, light olive-gray, 

finely to medium - 

crystalline................. 2

Dolomite, medium-bedded, 

light olive-gray, very sandy, 

finely to mediumcrystalline. ................ 1

Dolomite, thin-bedded, 

brownish-gray, finely to 

medium-crystalline; sandy 

in lower 6 inches ........... 2

Dolomite, medium-bedded, 

light olive-gray, finely to 

medium-crystalline......... 3

Dolomite, medium-bedded, 

light olive-gray, finely 

to medium-crystalline. ..................... 1

10

10

37
Ordovician rocks Continued

Everton formation Continued

Dolomite, medium-bedded, 

very light gray, very sandy, 

finely to mediumcrystalline.................. 1

Dolomite, medium-bedded, 

light olive-gray, finely to 

medium-crystalline ......... 2

Dolomite, medium-bedded, 

medium-gray to light-gray, 

finely to mediumcrystalline................. 1

Dolomite, medium-bedded, 

medium-gray to light-gray, 

sandy, finely to mediumcrystalline ................ 1

Dolomite, medium-bedded, 

medium-gray to light-gray, 

finely to mediumcrystalline ................. 3

Sandstone, medium-bedded, 

light-gray to white, dolomitic, fine- to mediumgrained; .upper 3 inches is 

sandy dolomite ........... . 3

Dolomite, medium-bedded, 

light-gray, finely to mediumcrystalline; contains scattered sand .grains ........... 1

Dolomite, medium-bedded, 

light-gray to light olivegray, finely to medium - 

crystalline; contains scattered 

sand grains................. 2

Sandstone, medium-bedded, 

very light gray to white, 

dolomitic, mediumgrained .................... 1

Dolomite, medium-bedded, 

light-gray to light olive - 

gray, finely to mediumcrystalline; contains scattered sand grains .......... 2

Sandstone, medium-bedded, 

light-gray to white, dolomitic, quartzitic, fine- to 

medium-grained; contains 

thin dolomite stringers ...... 2

.Dolomite, medium-bedded, 

light olive-gray, finely to 

medium-crystalline; c'ontains scattered sand 

grains ..................... 1

Sandstone, medium-bedded, 

light-gray to white, dolomitic, 

quartzitic, fine- to mediumgrained .................... 2

Dolomite, medium-bedded, 

brownish-gray to light 

brownish-gray, sandy, finely 

to medium-crystalline; sand 

content increases 

upward .................... 5

Sandstone, medium-bedded, 

brownish-gray to white, 

dolomitic, fine- to mediumgrained ................... 1

Ft in Ft in

Ordovician rocks Continued

Everton formation Continued

Dolomite, medium-bedded, 

light brownish-gray to 

brownish-gray, finely 

crystalline................. 1

Dolomite, medium-bedded,

light brownish-gray to grayishbrown, sandy, finely crystalline; becomes increasingly 

sandy downward ............ 3

Sandstone, very thin bedded, 

very light gray to white, 

limy, fine- to mediumgrained ....................

Dolomite, medium-bedded,

light brownish-gray to grayishbrown, finely crystalline; contains scattered sand 

grains ..................... 1

Dolomite, medium-bedded, 

light brownish-gray to dark 

brownish-gray, finely 

crystalline; contains a 2-inch 

dolomitic sandstone stringer 

near the top................ 5

Dolomite, medium-bedded, 

light-gray to white, sandy, 

finely to medium-crystalline; 

sand content increases 

downward .................. 1

Sandstone, medium-bedded, 

light-gray to white, quartzitic, 

fine- to mediumgrained. ...................

Dolomite, medium-bedded, 

light brownish-gray, finely 

to medium-crystalline; contains scattered 

sand ...................... 4

Dolomite, medium-bedded, 

brownish-gray to light olivegray, finely to mediumcrystalline ................. 5

Dolomite, medium-bedded, 

medium-gray, finely to 

medium crystalline ......... 5

Dolomite, medium-bedded, 

brownish-gray to light 

brownish-gray, finely to 

medium-crystalline; lower 

4 inches sandy to very 

sandy...................... 5

Sandstone, medium-bedded, 

very light gray to white, 

fine- to medium-grained; 

lower 2 inches is 

dolomitic .................. 5

Dolomite, medium- to 

thick-bedded, medium 

dark gray to brownishgray, finely granular, 

finely to medium - 

crystalline................. 4

Sandstone, thin- to 

medium-bedded, white, 

dolomitic, mediumgrained .................... 2

38
Ft in 

Ordovician rocks Continued

Everton formation Continued

Dolomite, very thin to thinbedded, light olive -gray to 

light-gray, finely granular 

to finely crystalline......... 2 7

Dolomite, medium-bedded, 

dark-gray to brownish - 

gray, finely granular to 

finely crystalline ........... 4 1

Dolomite, medium-bedded, 

medium dark gray to 

brownish-gray, very finely 

granular to finely 

crystallina................. 5 0

Dolomite, m edium - 

bedded, medium -gray 

to brownish-gray, sandy, 

finely to m edium - 

crystalline ................. 1 8

Dolomite, medium-bedded, 

medium-gray to brownishgray, finely to mediumcrystalline ................. 3 8

Covered interval.............. 6 6

Dolomite, platy, light-gray to 

light brownish-gray, finely 

granular to finely 

crystalline ................ 1 5

Sandstone, platy to thinbedded, white, dolomitic, 

medium-grained ........... 6

Dolomite, platy to mediumbedded, light-gray to light 

brownish-gray, sandy, finely 

granular to finely 

crystalline................. 1 3

Dolomite, medium- to thickbedded, medium- to darkgray, very finely granular 

to finely crystalline; 6-inch 

sandy dolomite bed near middle 

of unit..................... 4 1

Dolomite, medium- to 

thick-bedded, brownishgray, finely 'to mediumcrystalline. .................. 5 0

Ft in 

Ordovician rocks Continued

Everton formation Continued

Dolomite, thin- to mediumbedded, medium-gray to 

light olive-gray, sandy, 

finely granular to finely 

crystalline ................. 4 0

Sandstone, medium-bedded, 

light-gray to yellowishgray, dolomitic, fine- to 

medium-grained ........... 8

Dolomite, thin- to mediumbedded, light-gray and light 

brownish-gray, very finely 

granular to finely 

crystalline................. 3 2

Dolomite, medium- to thickbedded, light-gray to brownishgray, very finely granular 

to finely crystalline; sandy 

in lower 18 inches.......... 4 0

Dolomite, medium-bedded,

light-gray and light brownish- " 

gray, finely to mediumcrystalline; sandy in lower 

18 inches .................. 5 0

Sandstone, medium-bedded, 

white, quartzitic, fine- to 

medium-grained; dolomitic 

in the upper 4 inches........ 10

Dolomite, medium-bedded, 

light-gray (orange-mottled), 

sandy, dense to finely crystalline; sand content decreases 

upward ..................... 4 7

Dolomite, medium- to thickbedded, orange-gray mottled 

light-gray and light olive-gray, 

very finely granular to finely 

crystalline ................. 3 2

Dolomite, medium- to thickbedded, light-gray to light olive - 

gray, dense to finely 

crystalline................. 5 0

Base of section 65 feet above river level. ______

398 0

LITERATURE CITED

Adams, G. I., and Ulrich, E. O., 1905, U. S. Geol.

Survey Geol. Atlas, Fayetteville folio (no. 119). 

Croneis, Carey, 1930, Geology of the Arkansas

Paleozoic area: Arkansas Geol. Survey, Bull. 3,

p. 26-28. 

Giles, Albert, W., 1930, St. Peter and older Ordovician

sandstones of northern Arkansas: Arkansas Geol.

Survey, Bull. 4, p. 5, 10. 

Lantz, R. J., 1950, Geological formations penetrated

by the Arkansas-Louisiana Gas Company No. 1

Barton well on the Cecil anticline, Franklin County,

Arkansas: Arkansas Res. and Devel. Comm.,

Div. Geology, Bull. 18. 

McKnight, E. T., 1935, Zinc and lead deposits of

northern Arkansas: U. S. Geol. Survey Bull. 853.

Maher, J. C., and Lantz, R. J., 1952, Described

.sections and correlation of Paleozoic rocks at Gilbert,

Carver, and Marshall, Ark.: U. S. Geol. Survey

Circ.160. 

________ 1953, Geology of the Gilbert area,

Searcy County, Ark.: U. S. Geol. Survey

OM 132. 

Owen, D. Dv 1847, Preliminary report of the

geological survey of Wisconsin and Iowa: 30th Cong.,

1st sess., Sen. Ex. Doc. 2. 

Purdue, A. H., and Miser, H. D., 1916, U. S. Geol.

Survey Geol. Atlas, Eureka Springs-Harrison

folio (no. 202). 

Ulrich, E. O., 1911, Revision of the Paleozoic systems:

Geol. Soc. AmericaBulL, v. 22, p. 281-680.

39

IHT.-tW. SEC., WASH., D.C. U61S(J