Tuscumbia Limestone and Fort Payne Chert undivided

Tuscumbia Limestone -- light-gray partly oolitic limestone; very coarse bioclastic crinoidal limestone common; light-gray chert nodules and concretions locally abundant. Fort Payne Chert -- very light to light-olive-gray, thin to thick-bedded fine to coarse-grained bioclastic (abundant pelmatozoans) limestone containing abundant nodules, lenses and beds of light to dark-grey chert. Upper part of formation locally consists of light-bluish-gray laminated siltstone containing vugs lined or filled with quartz and scattered throughout the formation are interbeds of medium to greenish-gray shale, shaly limestone and siltstone. Lenses of dark-gray siliceous shale occur locally at the base of the Fort Payne in Wills Valley. Commonly present below the Fort Payne is a ligh-olive-gray claystone or shale (Maury Formation) which is mapped with the Fort Payne. The Tuscumbia and Fort Payne are undifferentiated in Murphrees and Wills Valleys.
State Alabama
Name Tuscumbia Limestone and Fort Payne Chert undivided
Geologic age Mississippian
Lithologic constituents
Major
Sedimentary > Carbonate > Limestone (Bed)Tuscumbia Limestone - light-gray partly oolitic limestone; very coarse bioclastic crinoidal limestone common; Fort Payne Chert - very light to light-olive-gray, thin to thick-bedded fine to coarse-grained bioclastic (abundant pelmatozoans) limestone & shaly limestone.
Minor
Sedimentary > Clastic > Siltstone (Bed)Fort Payne Chert - Upper part of formation locally consists of light-bluish-gray laminated siltstone containing vugs lined or filled with quartz.
Sedimentary > Clastic > Mudstone > Shale (Bed)Fort Payne Chert - scattered throughout the formation are interbeds of medium to greenish-gray shale, shaly limestone; lenses of dark-gray siliceous shale occur locally at the base of the Fort Payne in Wills Valley.
Sedimentary > Clastic > Mudstone > Claystone (Bed)Commonly present below the Fort Payne is a ligh-olive-gray claystone or shale (Maury Formation) which is mapped with the Fort Payne.
Sedimentary > Chemical > Chert (Bed)Tuscumbia Limestone - light-gray chert nodules and concretions locally abundant; Fort Payne Chert - abundant nodules, lenses and beds of light to dark-grey chert.
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.

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Counties Blount - DeKalb - Etowah - Jackson - Jefferson - Marshall