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Frog Mountain Sandstone

Frog Mountain Sandstone -- light to dark-gray sandstone with thin dark-gray shale interbeds, light-gray to black dolomudstone, glauconitic limestone, and fossiliferous chert locally in lower part.
State Alabama
Name Frog Mountain Sandstone
Geologic age Devonian
Primary rock type sandstone
Secondary rock type shale
Other rock types mudstone; limestone; chert
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone (Bed)
Minor
Sedimentary > Clastic > Mudstone > Shale (Bed)thin dark-gray shale interbeds
Incidental
Sedimentary > Chemical > Chert (Bed)fossiliferous chert
Sedimentary > Clastic > Mudstone (Bed)light-gray to black dolomudstone
Sedimentary > Carbonate > Limestone (Bed)glauconitic limestone
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 Calhoun - Cherokee