![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/f/f2/Pottsville_Formation_Worlds_End.jpg/640px-Pottsville_Formation_Worlds_End.jpg&w=640&q=50)
Pottsville Formation
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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.
Quick Facts Type, Sub-units ...
Pottsville Formation | |
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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] |
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![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/5/5f/Blackwater_Falls.jpg/640px-Blackwater_Falls.jpg)
Blackwater Falls in West Virginia. The major ledge is Connoquenessing sandstone of the Middle Pottsville Formation.