USGS Visual Identifier
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Geologic Unit: Oswego

Oswego Sandstone (NY*,PA*,VA*,WV*)
Oswego Formation (VA)
Oswego Formation of Judy Gap Group (WV)
Oswego Sandstone of Lorraine Group (NY)

Ordovician, Late*

Geologic Province:
Appalachian basin*

Areal Extent:

Type Locality:
Type area: Oswego Co., central NY.

Unit Name History:
First used (Prosser, 1888). Named (Prosser, 1890). Abandoned (Clarke and Schuchert, 1899). Reinstated (Hartnagel, 1905). Overview in PA (Butts, 1936). Extended into WV (Woodward, 1951). Included in Lorraine Group in NY (Rickard, 1970). Overview in VA (Rader and Biggs, 1976). Included in Judy Gap Group (Chen, 1977). Overview in WV (Dean and others, 1985). Areal limits; Age modified (Ryder, 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