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GEOLOGIC MAP OF THE DENVER 7.5 QUADRANGLE,CLEVELAND COUNTY, OKLAHOMA

Thomas M. Stanley and Galen W. Miller2002

′

OKLAHOMA GEOLOGICAL SURVEYCharles J. Mankin, DirectorO

KL

AH

OM

A GEOLOGICAL SU

RV

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1908 CENTENNIAL 200

8

APPROXIMATE MEAN DECLINATION

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C N

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E N

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°8½

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UNCONFORMITY

HOLOCENE

LEONARDIAN

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ATE

RN

AR

YPE

RM

IANPhy

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CORRELATION OF MAP UNITS

Qadm

DESCRIPTION OF UNITS

ALLUVIUM (Holocene) Clay, silt, sand, and gravel in channels and on flood plains of modern streams. Includes terrace deposits of similar composition located directly above and adjacent to modern channels and flood plains. Thickness: 0 to about 30 ft

ALLUVIUM OF DAVE BLUE CREEK (Holocene) Clay, silt, sand, and gravel on recent flood plain of Dave Blue Creek about 5-10 ft above most recent alluvial valley. Areas periodically subject to flooding. Thickness: unknown, possibly as much as 20 ft

HENNESSEY FORMATION (Permian) Mostly a poorly exposed, moderate reddish brown (10R4/6), moderate red (5R4/6), to moderate reddish orange (10R6/6) muddy siltstone, silty shale, with minor very fine grained sandstone; locally with conspicuous light greenish gray (5GY8/1) to pale green (10G6/2) iron-reduction spots and bands. Spots average ¼ in. in diameter, found throughout unit; bands usually oriented sub-parallel to bedding and are more common in lower third of unit. Minor lenticular beds of very fine grained sandstone and siltstone-pebble conglomerate also occur, with conglomerates common in basal half, rare in upper half. Siltstone moderately to well stratified with thin to laminated trough-cross-stratification and/or ripple-marks; typically weathers to bench-and-slope topography, particularly common in basal 30 ft of formation. Locally, sandstone cross-stratified, but rarely forming channel deposits. Siltstone and sandstone exhibit platy to flaggy weathering, muddy soil. Contact with underlying Garber Formation placed at top of highest mappable fine- to medium-grained Garber sandstone bed. Thickness: only lower 80 ft of formation exposed in map area

GARBER FORMATION (Permian) Sandstone, mostly fine-grained to less commonly very fine to medium-fine-grained; appears to be very fine grained near base; moderate reddish brown (10R4/6), moderate reddish orange (10R6/6), moderate red (5R5/4), light brown (5YR5/6), and dark yellowish orange (10YR6/6); minor siltstone, shale, and siltstone-pebble conglomerate. Sandstone typically porous and friable; commonly weathers to smooth, rounded outcrops; locally with platy to flaggy to rarely slabby appearance. Locally, weathers to hard, dark-colored (grayish black [N2]) beds completely cemented with hematite, calcite, barite, and/or rarely silica. Dark-colored sandstone blocks locally form lag deposit over weathered outcrops. Large- and small-scale planar crossbeds and trough crossbeds common; many outcrops characterized by inclined beds and channelform deposits, although plane-parallel stratification also present. A fairly widespread moderate red (5R5/4) to pale red (5R6/2), 2- to 3-ft-thick conglomerate bed occurs within 15 ft of the top of the formation. The bed consists of pebble-size siltstone and shale clasts, rarely dolomite and limestone clasts set in a medium- to coarse-grained sandstone matrix. Sandstone locally color-banded (e.g., moderate reddish brown (10R4/6), grayish red purple (5RP4/2), and grayish yellow green (5GY7/2)) or with mottled appearance. Small calcareous and iron-oxide spheres occur locally on weathered surfaces. Circular iron-reduction spots very rare, except in uppermost 10 to 20 ft near contact with Hennessey Formation. Siltstone and shale very sandy, color-banded (e.g., moderate reddish brown (10R4/6) and yellowish gray (5Y7/2)), stratified to unstratified, and with uncommon iron-reduction spots as large as 2 in. in diameter. Siltstone with minor shale common near top of formation. In places, siltstone and shale contain evidence of paleosol development such as blocky weathering, fractures with surfaces marked by small slickensides, through-going curved fractures, and calcrete deposits. Thickness: about 1030 ft based on cross-section; basal 970 ft not exposed in map area

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Oklahoma Geologic Quadrangle OGQ-30Geologic Map of the Denver

7.5 Quadrangle(previously Open-File Report OF12-2002)

′

Unit contact; dashed where approximate

Outcrop, geologic observation

Petroleum well. Includes oil, gas, oil and gas, dry service (water

from Natural Resources Information System database

SYMBOLS

Barite nodules

Outcrop, bearing of paleocurrent direction

Mappable bed of conglomerate

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Current Map

Mapped Quadrangles

Major Cities

Expanding Suburbs and Communities

5 Miles

North

EXPLANATION

E E’

E’’’ E’’’’’E’’’’

E’’

D D’

D’’ D’’’ D’’’’’D’’’’

C C’ C’’ C’’’ C’’’’’C’’’’

City

B B’ B’’ B’’’ B’’’’’B’’’’

A A’ A’’ A’’’ A’’’’ A’’’’’

97°45’35°45’ 35°45’

97°07’30’’

35°07’30”97°07’30”

35°07’30”97°45’

Moore

Choctaw

DelCity

Base Map Credits

Geologic Map Credits

The base map was compiled by the U.S. Geological Survey and planimetry revised from aerial photographs taken 1957. Field checked 1958. Revised from aerial photographs taken 1969 and 1975. Universal Transverse Mercator (UTM) projection. 1927 North American Datum. 10,000-foot grid ticks based on Oklahoma coordinate system, south zone. 1,000-meter UTM grid, zone 14.

Geology by Thomas M. Stanley and Galen W. Miller, 2001-2002. Assisted by Nicole Baylor and Ivan London. Research supported by the U.S. Geological Survey, National Cooperative Geologic Mapping Program, under Assistance Award Number 01HQAG0107. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. Government. Originally published as Open-File Report OF12-2002. Map revised and published as OGQ-30. Cartography and layout prepared by G. Russell Standridge, 2002.