Usage:
Canajoharie Shale of Trenton Group (NY*-local)
Canajoharie Formation of Trenton Group (NY-local)
Recognized locally in Mohawk River Valley area. Rocks included in Utica Shale by some geologists. See also Utica.
Subunits:
(alphabetical) --all in NY: Chuctenunda Member, Fairfield Member, Fort Plain Member, Gansevoort Member, Minaville Member, Morphy Member, Sprakers Shale Member.
Geologic age:
Late Ordovician (Mohawkian; Chatfieldian)*
Type section, locality, area and/or origin of name:
Type section [composite?]: along Canajoharie Creek and along Flat Creek south of Sprakers, Montgomery Co., east-central NY (Kay, 1937).
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 ([ ]).