Geologic Unit: Reedsville
Reedsville Formation (PA,VA,WV)
Reedsville Shale (PA*,TN*,VA*,WV*,OH*)
Reedsville Shale of Chickamauga Group (TN)
Exposures at Reedsville, Mifflin Co., central PA (Ulrich, 1912).
Unit Name History:
Named (Ulrich, 1911). Overview in PA (Butts, 1936). Revised (Kay, 1944). Extended into TN (Rodgers, 1953). Revised to Reedsville Formation (Conlin, 1962). Included in Chickamauga Group (Harris, 1965). Extended into WV (Patchen, 1967). Isotopic dating (Lapham, 1971). Overview (Dean and others, 1985). Overview (Faill and others, 1989). Revised; Age modified; Extended into OH subsurface (Ryder, 1992).
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Asterisks (*) indicate usage by the U.S. Geological Survey. Other usages by state geological surveys.
"No current usage" implies that a name has been abandoned or that it has fallen into disuse. Former usage and, if known, replacement name given in parentheses ().
Slashes (/) indicate unit name usage violates the 1983 North American Stratigraphic Code. This violation may be explained within brackets ([ ]).
U.S. Department of the Interior, U.S. Geological Survey, Reston, VA, USA
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Last modified: 15-Jan-2013