Pottsville Formation
The Pennsylvanian Pottsville Formation is a mapped bedrock unit in Pennsylvania, western Maryland, West Virginia, Ohio, and Alabama. It is a major ridge-former in the Ridge-and-Valley Appalachians of the eastern United States. The Pottsville Formation is conspicuous at many sites along the Allegheny Front, the eastern escarpment of the Allegheny or Appalachian Plateau.
| Pottsville Formation | |
|---|---|
| Stratigraphic range: Pennsylvanian | |
Typical Pottsville Formation at Worlds End State Park, Sullivan County, Pennsylvania | |
| Type | sedimentary |
| Sub-units | see Stratigraphy section |
| Underlies | Brookville Coal of Allegheny Formation (OH, PA) Llewellyn Formation |
| Overlies | Coldwater Shale, Cuyahoga Formation, Logan Formation, Mauch Chunk Formation, Maxville Limestone, and Parkwood Formation |
| Lithology | |
| Primary | sandstone, conglomerate |
| Other | limestone, shale, coal |
| Location | |
| Region | Appalachian Mountains |
| Extent | Alabama, Maryland, Mississippi, Ohio, Pennsylvania, and West Virginia |
| Type section | |
| Named for | Pottsville, Pennsylvania |
| Named by | J. P. Lesley, 1876 |
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