![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/en/thumb/c/c8/Llewellyn.jpg/640px-Llewellyn.jpg&w=640&q=50)
Llewellyn Formation
From Wikipedia, the free encyclopedia
The Llewellyn Formation is a mapped bedrock unit in eastern Pennsylvania. It was previously known as the "coal measures" and the post-Pottsville rocks. The formation is named for the community of Llewellyn in Schuylkill County.[1]
Quick Facts Type, Unit of ...
Llewellyn Formation | |
---|---|
Stratigraphic range: Late Pennsylvanian ~308–300 Ma | |
![]() A hand sample of the bottom of the Llewellyn from St. Clair, Pennsylvania | |
Type | Sedimentary |
Unit of | none |
Sub-units | none (most economic coal beds are named) |
Overlies | Pottsville Formation |
Thickness | up to 1,500 feet (460 m)[1] |
Lithology | |
Primary | Sandstone |
Other | Shale, Conglomerate, Coal |
Location | |
Region | Appalachian Basin of eastern North America |
Extent | Anthracite fields of Pennsylvania |
Type section | |
Named for | Llewellyn, Pennsylvania |
Named by | G. Wood, 1964 |
Close