| 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)[1] 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[2] |
Blackwater Falls in West Virginia. The major ledge is Connoquenessing sandstone of the Middle 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.[3] The Pottsville Formation is conspicuous at many sites along the Allegheny Front, the eastern escarpment of the Allegheny or Appalachian Plateau.
- ^ Rice, C.L., Hiett, J.K., and Koozmin, E.D., 1994, Glossary of Pennsylvanian stratigraphic names, central Appalachian basin, IN Rice, C.L., ed., Elements of Pennsylvanian stratigraphy, central Appalachian basin: Geological Society of America Special Paper, 294, p. 115-155.
- ^ Lesley, J.P., 1876, The Boyd's Hill gas well at Pittsburgh; Appendix E: Pennsylvania Geological Survey Report of Progress, 2nd series, v. L, p. 221-227.
- ^ Kempler, Steve (2007-01-19). "Geomorphology : Chapter 2 Plate T-12 : Folded Appalachians". NASA, Goddard Earth Sciences (GES), Data and Information Services Center (DISC). Archived from the original on 2007-12-06. Retrieved 2008-03-16.
The major ridge makers are the Tuscarora (T), Pocono (Po), and Pottsville (Pt) Formations.