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National Geologic Map Database

Geologic Unit: Sonyea

Usage:

Sonyea Formation (NY*,PA*,WV*,OH*,MD*)
Sonyea Group (NY,PA)


Subunits:

Middlesex Shale Member (NY*,PA*,OH*,WV*,MD*), Cashaqua Shale Member (NY*,PA*,OH*,WV*,MD*)


Geologic age:

Late Devonian*


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

Outcrops on Keshequa Creek southwest of Sonyea, Groveland Twp., Livingston Co., NY.
Reference section: outcrops on Buck Creek in Mount Morris Twp., 3 miles northwest of Sonyea.


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 ([ ]).