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National Geologic Map Database

Geologic Unit: West River

Usage:

West River Shale Member of Genesee Formation (NY*,WV*,OH*,PA*,MD*)
West River Shale of Genesee Group (NY)


Subunits:

Penn Yan Shale Member or Penn Yan Tongue (NY), Milo Tongue (NY).


Geologic age:

Late Devonian*


Type section, locality, area and/or origin of name:

Type area: Canadaigua Lake, western NY. Named from exposures in West River valley, Yates Co., NY.
Reference section: exposures in Seneca Point Gully on west side of Canandaigua Lake, 9 mi north of Naples, Ontario Co., NY.


AAPG geologic province:

Appalachian basin*


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).