DIGITAL GEOLOGIC QUADRANGLE MAP GEOLOGIC MAP OF …co n sitfm are gy ld h-b k shale. Only in the...
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DIGITAL GEOLOGIC QUADRANGLE MAPBARBER, ARKANSAS
DGM-AR-00050
Funded by United States Geological Surveyin cooperation with the Arkansas Geological Commission,
under the CoGeo Map Project
SYMBOLS
Ù sv
Ù ma
Ù hs
Ù sv
Ù ma
Ù hs
Ù a m
Ù al
Ù au
CORRELATION OF MAP UNITS
Paleozoic
Ù sv
Ù ma
Ù hs
Ù a m
Ù al
Savanna Formation (Pennsylvanian) – The Formation consists of dark gray shale and silty shale, with minor amounts of light-gray siltstone and gray very fine to fine sandstone. In this unit a few plant and invertebrate fossils may be found. This unit is about 1600 feet thick and was deposited in a fluvial environment.
McAlister Formation (Pennsylvanian) – The Formation consistsof gray to black shale, tan to gray, thin-bedded sandstone, with a few coal beds. Plant and invertebrate fossils may be found from several horizons in the unit, which is 500 to 2300 feet thick. The unit was deposited in a fluvial environment.
Middle Atoka Formation (Pennsylvanian) – The Formationconsists of marine tan to gray silty sandstone and grayish-black shale. Only in the Arkansas Valley and Frontal OuachitaMountain provinces is this formation split into the upper, middle, and lower members. The Atoka Formation has athickness of about 25,000 feet.
Lower Atoka (Pennsylvanian) The lower Atoka is a sequence of marine, mostly tan to gray silty sandstones and grayish-black shales. Some rare calcareous beds and siliceous shales areknown. This unit has the largest areal extent of any of thePaleozoic formations in the state.
Upper Atoka Formation (Pennsylvanian) – The Formation consists of marine tan to gray silty sandstone and grayish-black shale. Only in the Arkansas Valley and Frontal OuachitaMountain provinces is this formation split into the upper, middle,and lower members. The Atoka Formation has a thickness of about 25,000 feet.
DESCRIPTION OF MAP UNITS
McFarland, J. D., 1998, Stratigraphic Summary of Arkansas; Arkansas Geological Commission Information Circular 36, 39p
REFERENCES
Haley, B. R., 1966, Geology of the Barber quadrangle, Sebastian County and vicinity, Arkansas: Arkansas Geological Commission Information Circular 20C, 76 p.
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GEOLOGIC MAP OF THE BARBER QUADRANGLE, SEBASTIAN,LOGAN, AND FRANKLIN COUNTIES, ARKANSAS
Geology by Boyd R. Haley and Charles G. StoneDigital compilation by Walter K. Mayfield
2003Edited by William D. Hanson
Arkansas Geological Commission, State Geologist, Mac B. Woodward
Ù au
Hartshorne Formation (Pennsylvanian) – The Formation consistsof brown to gray, massive, cross-bedded, medium grained sandstone, and some coal beds in the lower part of the unit. Plant fossils occur in the unit but are not abundant. Thisformation was deposited in a fluvial environment and ranges inthickness from 10 to 300 feet.
Pennsylvanian
Revision Date: November 2011Digital Revision by: Nathan H. Taylor
Æ Abandoned mine or quarryÆR Reclaimed mine or quarryCO Coal
Contact
Strike and Dipo40
Sh Shale
( ( ( Thrust Fault
