Reedsville Formation
The Ordovician Reedsville Formation is a mapped surficial bedrock unit in Pennsylvania, Maryland, Virginia, West Virginia, and Tennessee, that extends into the subsurface of Ohio. This rock is a slope-former adjacent to (and stratigraphically below) the prominent ridge-forming Bald Eagle sandstone unit in the Appalachian Mountains. It is often abbreviated Or on geologic maps.
| Reedsville Formation | |
|---|---|
| Stratigraphic range: Late Ordovician | |
Outcrop of Reedsville Formation on south side of U.S. Route 522, Blacklog Gap, Huntingdon County, Pennsylvania. | |
| Type | sedimentary |
| Unit of | Chickamauga Group (TN only) |
| Underlies | Bald Eagle Formation and Juniata Formation |
| Overlies | Antes Gap Shale, Trenton Limestone in TN and Utica Shale in WV |
| Lithology | |
| Primary | shale |
| Other | sandstone |
| Location | |
| Region | Appalachian Mountains |
| Extent | Maryland, Pennsylvania, Tennessee, Virginia, West Virginia |
| Type section | |
| Named for | Reedsville, Pennsylvania |
| Named by | E. O. Ulrich |
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