Tuscumbia Limestone and Fort Payne Chert undifferentiated

Tuscumbia Limestone -- light to dark-gray fossiliferous and oolitic partly argillaceous and cherty limestone. Apparently present only along part of the northwest limb of the Coosa synclinorium. Fort Payne Chert -- dark-gray to light-gray limestone with abundant irregular light-gray chert nodules and beds. Commonly present below the Fort Payne is greenish-gray to grayish-red phosphatic shale (Maury Formation) which is mapped with the Tuscumbia Limestone and Fort Payne Chert undifferentiated.
State Alabama
Name Tuscumbia Limestone and Fort Payne Chert undifferentiated
Geologic age Mississippian
Lithologic constituents
Major
Sedimentary > Chemical > Chert (Bed)Tuscumbia Limestone - cherty limestone; Fort Payne Chert - abundant irregular light-gray chert nodules and beds
Sedimentary > Carbonate > Limestone (Bed)Tuscumbia Limestone - light to dark-gray fossiliferous and oolitic partly argillaceous and cherty limestone; Fort Payne Chert - dark-gray to light-gray limestone
Minor
Sedimentary > Clastic > Mudstone > Shale > Phosphatic-shale (Bed)Commonly present below the Fort Payne is greenish-gray to grayish-red phosphatic shale (Maury Formation)
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 Bibb - Calhoun - Cherokee - Chilton - Etowah - Jefferson - Saint Clair - Shelby - Talladega