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Parkwood Formation and Floyd Shale undifferentiated

Parkwood Formation and Floyd Shale undifferentiated - Parkwood Formation -- Interbedded medium to dark-gray shale and light to medium-gray sandstone; locally contains dusky-red and grayish-green mudstone, argillaceous limestone, and clayey coal. 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 Parkwood Formation and Floyd Shale undifferentiated
Geologic age Pennsylvanian-Mississippian
Primary rock type shale
Secondary rock type sandstone
Other rock types mudstone; limestone; chert; mixed clastic/coal; clay or mud
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale (Bed)Parkwood Formation -- Interbedded medium to dark-gray shale; Floyd Shale -- Dark-gray shale, sideritic in part
Minor
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Clastic > Mudstone (Bed)
Incidental
Sedimentary > Carbonate > Limestone (Bed)Parkwood Formation -- argillaceous limestone; Floyd Shale -- beds of partly bioclastic, partly argillaceous limestone are abundant in parts of Calhoun and Cherokee Counties.
Sedimentary > Chemical > Chert (Bed)in Floyd Shale
Sedimentary > Coal (Bed)clayey coal
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 - Chilton - Coosa - Saint Clair - Shelby - Talladega - Tuscaloosa