Pottsville Formation

Predominantly gray sandstone and conglomerate; also contains thin beds of shale, claystone, limestone, and coal; includes Olean and Sharon conglomerates of northwestern Pennsylvania; thin marine limestones present in Beaver, Lawrence, and Mercer Counties; minable coals and commercially valuable high-alumina clays present locally.
State Pennsylvania
Name Pottsville Formation
Geologic age Pennsylvanian
Lithologic constituents
Major
Sedimentary > Clastic > Sandstone (Bed)Predominantly gray sandstone and conglomerate
Sedimentary > Clastic > Conglomerate (Bed)Predominantly gray sandstone and conglomerate, includes Olean and Sharon conglomerates of northwestern Pennsylvania
Incidental
Sedimentary > Clastic > Mudstone > Claystone (Bed)commercially valuable high-alumina clays present locally.
Sedimentary > Clastic > Mudstone > Shale (Bed)
Sedimentary > Carbonate > Limestone (Bed)thin marine limestones present in Beaver, Lawrence, and Mercer Counties;
Sedimentary > Coal (Bed)minable coals present locally
Comments Digital map differences from 1980 printed map: name changed from group to formation.
References

Berg, T.M., Edmunds, W.E., Geyer, A.R., and others, compilers, 1980, Geologic map of Pennsylvania: Pennsylvania Geological Survey, 4th ser., Map 1, 2nd ed., 3 sheets, scale 1:250,000.

Pennsylvania Bureau of Topographic and Geologic Survey, Department of Conservation and Natural Resources, Miles, C.E., and Whitfield, T.G., compilers, 2001, Bedrock Geology of Pennsylvania, edition: 1.0, digital map, scale 1:250,000.

NGMDB product
Counties Armstrong - Beaver - Bedford - Blair - Bradford - Butler - Cambria - Cameron - Centre - Clarion - Clearfield - Clinton - Crawford - Elk - Fayette - Forest - Fulton - Huntingdon - Indiana - Jefferson - Lawrence - Lycoming - McKean - Mercer - Potter - Somerset - Sullivan - Tioga - Venango - Warren - Westmoreland - Wyoming