Floyd Shale

Dark-gray shale, sideritic in part; thin beds of sandstone, limestone and chert are locally present; beds of partly bioclastic, partly argillaceous limestone are abundant in parts of Calhoun and Cherokee Counties.
State Alabama
Name Floyd Shale
Geologic age Mississippian
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale (Bed)dark-gray shale, sideritic in part
Incidental
Sedimentary > Carbonate > Limestone (Bed)beds of partly bioclastic, partly argillaceous limestone are abundant in parts of Calhoun and Cherokee Counties.
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Chemical > Chert (Bed)
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 Bibb - Calhoun - Cherokee - Etowah - Jefferson - Saint Clair - Shelby - Tuscaloosa