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Floyd Shale

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
Primary rock type shale
Secondary rock type sandstone
Other rock types limestone; chert
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale (Bed)dark-gray shale, sideritic in part
Incidental
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Chemical > Chert (Bed)
Sedimentary > Carbonate > Limestone (Bed)beds of partly bioclastic, partly argillaceous limestone are abundant in parts of Calhoun and Cherokee Counties.
Map references
Szabo, M. W., Osborne, E. W., Copeland, C. W. Jr., Neathery; T. L., 1988, Geologic Map of Alabama, Geological Survey of Alabama Special Map 220, scale 1:250,000.
Unit references
Szabo, M. W., Osborne, E. W., Copeland, C. W. Jr., Neathery; T. L., 1988, Geologic Map of Alabama, Geological Survey of Alabama Special Map 220, scale 1:250,000.
Counties Bibb - Calhoun - Cherokee - Jefferson - Saint Clair - Tuscaloosa