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 published by U.S. Geological Survey authors.
"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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).