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(OHATCHEE)SCALE 1:24,000

CONTOUR INTERVAL 20 FEETNATIONAL GEODETIC VERTICAL DATUM OF 1929

1/ 21 0 1 MILE

1 KILOMETER1 0

Berry H. (Nick) Tew, Jr.State Geologist

GEOLOGIC MAP AND CROSS SECTIONS OF THE STEELE 7.5-MINUTE QUADRANGLE, ST. CLAIR AND ETOWAH COUNTIES, ALABAMA

byW. Edward Osborne, G. Daniel Irvin, and William A. Thomas

2018

Base topographic map U.S. Geological Survey 1956. Photorevised 1972

Produced in cooperation with the U.S. GeologicalSurvey, National Cooperative Geologic Mapping Program

Polyconic projection. 1927 North American datum10,000-foot grid based on Alabama (East)rectangular coordinate system

Map rotated 0.45 degrees clockwise for display

QUADRANGLE LOCATION

UTM Grid and 2011 Magnetic NorthDeclination at Center of Sheet

GEOLOGICAL SURVEY OF ALABAMA QUADRANGLE SERIES MAP 69 PLATE

Digital database by G. Daniel Irvin

3o39’

GNMN

65 MILS2 MILS

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SYMBOLS FOR CROSS SECTIONS A-A', B-B', C-C', AND D-D'Stratigraphic contact

Fault showing relative movement

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DESCRIPTION OF MAP UNITS

Alluvium and low terrace deposits (Quaternary)—Unconsolidated deposits of sand, silt, clay, and gravel.

Pottsville Formation (Lower Pennsylvanian)—Light- to medium-gray, fine- to medium-grained and locally coarse-grained quartzose sandstone containing intervals of quartz-, shale-, and siderite-pebble conglomerate; intervals between sandstone units include shale and lenticular- and wavy-bedded sandstone and mudstone; carbonaceous shale and thin coal seams are locally present.

Parkwood Formation and Floyd Shale undifferentiated (Upper Mississippian and Lower Pennsylvanian)—Parkwood Formation: Medium- to dark-gray shale and mudstone containing interbedded units of light- to medium-gray sandstone; wavy- and lenticular-bedded sandstone and mudstone are common; interbeds of limestone and maroon and green shale are present in the middle part. Floyd Shale: Medium- to dark-gray shale containing interbeds of medium-gray, argillaceous, fossiliferous limestone; maroon, grayish-green, and black shale also present.

Bangor Limestone (Upper Mississippian)—Light- to medium-gray, crossbedded, bioclastic and lesser oolitic limestone in medium to massive beds; medium-gray, thin- to massive-bedded, fossiliferous, argillaceous limestone in the upper part; nodules, stringers, and interbeds of chert most common in lower and upper parts of the formation.

Hartselle Sandstone (Upper Mississippian)—Very light to light-gray, very fine to locally medium-grained, quartzose sandstone; locally contains interbeds and intervals of shale weathered light-olive-gray to grayish-tan.

Pride Mountain Formation and Monteagle Limestone undifferentiated (Upper Mississippian)—Pride Mountain Formation: Medium- to dark-gray fissile shale containing siderite nodules; contains grayish-orange to medium-gray, thin- to lenticular- and wavy-bedded, fine- to medium-grained sandstone in upper part. Monteagle Limestone: Interbedded medium-bluish-gray to dark-gray oolitic limestone and light-gray bioclastic limestone in medium to massive beds; bioclastic limestone locally contains nodules and stringers of dark-gray chert.

Tuscumbia Limestone, Fort Payne Chert, and Maury Formation undifferentiated (Lower and Middle Mississippian)—Tuscumbia Limestone: Light- to dark-gray, medium- to thick-bedded, bioclastic limestone locally containing chert nodules. Fort Payne Chert: Thin-bedded, partly fossiliferous, light- to dark-gray chert that commonly weathers grayish orange. Maury Formation: light-olive-gray and blue-greenish-gray claystone locally containing phosphatic concretions.

Chattanooga Shale (Upper Devonian)—Dark-gray to black, fissile, carbonaceous shale and mudstone; thin beds of medium- to dark-gray, fine- to medium-grained, partly pebbly sandstone are present at the base.

Red Mountain Formation (Lower and Upper Silurian)—Thinly interbedded gray and brown, fine-grained, partly ferruginous sandstone and tan to brown micaceous and sandy shale; contains calcareous and fossiliferous ironstone ore beds in the middle part.

Sequatchie Formation and Chickamauga Limestone (Middle and Upper Ordovician)—Sequatchie Formation: Variegated greenish-gray and maroon calcareous shale and thin-bedded, light-gray, argillaceous and fossiliferous limestone. Chickamauga Limestone: Light- to dark-gray, thin- to medium- to thick-bedded, argillaceous, fossiliferous, and locally fenestral limestone; medium-greenish-gray, thin- to thick-bedded, poorly sorted sandstone containing rounded to angular chert pebbles and variably colored chert-pebble conglomerate locally at base (Attalla Chert Conglomerate Member).

Sequatchie Formation, Colvin Mountain Sandstone, Greensport Formation, and Chickamauga Limestone undifferentiated (Middle and Upper Ordovician)— Sequatchie Formation: Light-greenish-gray and reddish-gray, finely crystalline mottled argillaceous dolomite and dolomitic mudstone. Greensport Formation: Grayish-red and grayish-green argillaceous dolomite, limestone, shale, mudstone, and siltstone. Chickamauga Limestone: Light- to medium-gray, thin- to medium-bedded fossiliferous limestone; light-gray, medium- to coarse-crystalline dolomite, light- to medium-gray limestone containing scattered chert clasts, and mottled grayish-red and olive-green fenestral mudstone locally present in lower part; chert-pebble conglomerate commonly at base (Attalla Chert Conglomerate Member).

Sequatchie Formation, Colvin Mountain Sandstone, Greensport Formation, and Chickamauga Limestone undifferentiated (Middle and Upper Ordovician)— Sequatchie Formation: Light-greenish-gray and reddish-gray, finely crystalline mottled argillaceous dolomite and dolomitic mudstone. Colvin Mountain Sandstone: Very light-gray, fine- to coarse-grained quartzose sandstone. Greensport Formation: Grayish-red and grayish-green argillaceous dolomite, limestone, shale, mudstone, and siltstone. Chickamauga Limestone: Light- to medium-gray, thin- to medium-bedded fossiliferous limestone; light-gray, medium- to coarse-crystalline dolomite, light- to medium-gray limestone containing scattered chert clasts, and mottled grayish-red and olive-green fenestral mudstone locally present in lower part; chert-pebble conglomerate commonly at base (Attalla Chert Conglomerate Member).

Attalla Chert Conglomerate Member of Chickamauga Limestone (Middle Ordovician)—Medium-greenish-gray, thin- to thick-bedded, poorly sorted sandstone containing rounded to angular chert pebbles and variably colored chert-pebble conglomerate.

Knox Group undifferentiated (Upper Cambrian and Lower Ordovician)—Light- to medium-gray, fine-crystalline, medium to massive-bedded dolomite containing irregular nodules and stringers of light- to medium-gray, dense chert; weathers to dominantly light-colored residual chert in an orange-brown to dark-reddish-brown clay matrix; residual chert commonly preserves the texture of the original carbonate rocks.

Conasauga Formation (Middle and Upper Cambrian)—Gadsden mushwad: Dark-gray to dark-greenish-gray shale commonly containing lenticular- to thin-bedded, medium- to dark-gray micritic limestone that is bioturbated, ribbon banded, and stylonodular in part. Dunaway Mountain thrust sheet: Light- to dark-gray, thin- to thick-bedded micritic limestone containing nodules and thin beds of light- to dark-bluish gray chert and medium- to dark-gray, thin- to medium-bedded mottled dolomite containing minor chert; light-gray, medium- to coarse crystalline dolomite in the uppermost part. Rome thrust sheet: Olive-green and medium- to dark-gray fissile shale containing lenticular to thin beds of medium-gray limestone that is partly stylonodular, bioturbated, and bioclastic.

SYMBOLS FOR GEOLOGIC MAPContact, located very approximately

Contact, concealed beneath mapped units

Thrust fault, located very approximately, sawteeth on upper plate

Thrust fault, concealed beneath mapped units

Trace of syncline axis, located approximately, arrow showing direction of plunge

Trace of anticline axis, located approximately, arrow showing direction of plunge

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Vertical bedding

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LegendSteeleGeologyPolygons

<all other values>

Unit

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