USGS Visual Identifier
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Geologic Unit: Ridgeley

Ridgeley Member of Old Port Formation (PA*)
Ridgeley Member of Oriskany Sandstone (MD*,VA,WV)
Ridgeley Sandstone of Oriskany Group (MD*,NJ,PA*,VA*,WV*)
Ridgeley Sandstone Member of Old Port Formation (PA*)
Ridgeley Sandstone Member of Oriskany Formation (MD,PA)

Devonian, Early*

Geologic Province:
Appalachian basin*

Areal Extent:

Type Locality:
Named from town of Ridgeley, Mineral Co., northeast WV (Swartz and others, 1913).

Unit Name History:
Named Ridgely sandstone member of Oriskany formation (Swartz and others, 1913). [Ridgeley spelling adopted to conform to U.S. Postal Guide.]
[GNU records (USGS DDS-6) indicate that C. Butts adopted Ridgeley sandstone of Oriskany group for use in his Bellefonte and Hollidaysburg, PA, folios in 1916. This would extend the unit from WV, through MD, to central PA.]
Extended into VA (Swartz, 1929).
Overview in VA (Cooper, 1944).
WV usage (Woodward, 1948).
Described in MD (Cloos, 1951).
Member of Oriskany in PA (Gray and others, 1960).
Assigned to Old Port Formation (Conlin and Hoskins, 1962).
Member of Oriskany Sandstone in MD (Yochelson and Kriz, 1974).
Mapped in Oriskany Group in PA (de Witt, 1974).
Member of Old Port in PA (Taylor, 1977; Wood, 1980).
Extended into NJ; Overview (Monteverde, 1992).

Note: If you need more information, please contact Nancy Stamm (
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
Database project personnel
Last modified: 15-Jan-2013