Chickamauga Limestone

Medium to dark-gray thick to thin-bedded partly argillaceous, locally fossiliferous limestone. Restricted to the western part of the Valley and Ridge province and Murphrees Valley and Wills Valley anticlines. Locally includes a thin interval of Attalla Chert Conglomerate Member at base. Attalla Chert Conglomerate - conglomerate of pebbles, cobbles, and boulders of chert and rare dolomite and quartzite in a sand-sized matrix; thin beds of gray-green or dusky-red shale common at base.
State Alabama
Name Chickamauga Limestone
Geologic age Ordovician
Lithologic constituents
Major
Sedimentary > Carbonate > Limestone (Bed)Medium to dark-gray thick to thin-bedded partly argillaceous, locally fossiliferous limestone.
Minor
Sedimentary > Chemical > ChertAttalla Chert - conglomerate of pebbles, cobbles, and boulders of chert and rare dolomite and quartzite in a sand-sized chert and quartz matrix.
Sedimentary > Clastic > Conglomerate (Bed)Attalla Chert - conglomerate of pebbles, cobbles, and boulders of chert and rare dolomite and quartzite in a sand-sized chert and quartz matrix.
Incidental
Sedimentary > Carbonate > DolostoneAttalla Chert - conglomerate of pebbles, cobbles, and boulders of chert and rare dolomite and quartzite in a sand-sized chert and quartz matrix.
Sedimentary > Clastic > Mudstone > Shalethin beds of gray-green or dusky-red shale common at base.
Metamorphic > Metasedimentary > Metaclastic > QuartziteAttalla Chert - conglomerate of pebbles, cobbles, and boulders of chert and rare dolomite and quartzite in a sand-sized chert and quartz matrix.
References

Szabo, M.W., Osborne, E.W., Copeland, C.W. Jr., and Neathery, T.L., 1988, Geologic Map of Alabama, Geological Survey of Alabama Special Map 220, scale 1:250,000.

NGMDB product
Counties Blount - DeKalb - Etowah - Jefferson - Saint Clair