Usage:
Fort Plain Member of Canajoharie Shale of Trenton Group (NY-local)
Fort Plain zone (informal) of Fairfield Member of Canajoharie Formation of Trenton Group (NY-local)
Recognized locally in Mohawk River Valley area, east-central NY. Rocks included in Utica Shale by some geologists. See also Utica.
Geologic age:
Late Ordovician (Mohawkian; Chatfieldian)
Type section, locality, area and/or origin of name:
Not stated by authors. Origin of name not stated. Origin of name not stated by authors. May have been named from Fort Plain, Montgomery Co., east-central NY (Ruedemann and Chadwick, 1935).
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 ([ ]).