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Pottsville Formation (lower part)

Pottsville Formation (lower part) - Light-gray thick-bedded to massive pebbly quartzose sandstone, containing varying amounts of interbedded dark-gray shale, siltstone, and thin discontinuos coal. The Boyles Sandstone Member is a formally named unit in the lower part of the formation. Top of unit is mapped at the Black Creek coal.
State Alabama
Name Pottsville Formation (lower part)
Geologic age Pennsylvanian
Comments Note: Printed map uses unit symbol 'Ppv1l'; digital map uses 'Ppv11(one)'; used Ppv11(one) here.
Primary rock type sandstone
Secondary rock type shale
Other rock types siltstone; coal
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone (Bed)Light-gray thick-bedded to massive pebbly quartzose sandstone
Minor
Sedimentary > Clastic > Siltstone (Bed)
Sedimentary > Clastic > Mudstone > Shale (Bed)
Incidental
Sedimentary > Coal (Bed)
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 Blount - Etowah - Franklin - Jefferson - Lawrence - Marion - Marshall - Morgan - Tuscaloosa - Walker - Winston