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)[1]
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,[2] West Virginia
Type section
Named for
Reedsville, Pennsylvania
Named by
E. O. Ulrich[3]
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.
^Harris, L.D., 1965, Geologic map of the Wheeler quadrangle, Claiborne County, Tennessee, and Lee County, Virginia: U.S. Geological Survey Geologic Quadrangle Map, GQ-435, 1 sheet, scale 1:24,000 http://ngmdb.usgs.gov/Prodesc/proddesc_903.htm
^Paleozoic Sedimentary Successions of the Virginia Valley & Ridge and Plateau
^Ulrich, E.O., 1911, Revision of the Paleozoic systems: Geological Society of America Bulletin, v. 22, p. 281-680.
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