Usage:
Utica Shale (IN*,MI*,NY*,OH*,PA*)
Subunits:
Flat Creek Member (NY) and Indian Castle Member (NY).
Geologic age:
Late Ordovician (Mohawkian; Chatfieldian)*; locally Cincinnatian (Edenian)
Type section, locality, area and/or origin of name:
Type area: well exposed in the Starch Factory Creek to the east of Utica. Named from City of Utica, Oneida Co., NY (Ruedemann, 1912).
AAPG geologic province:
Appalachian basin*
Cincinnati arch*
Michigan 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 ([ ]).