Usage:
Clays Ferry Formation (IN*,KY*,OH*)
Subunits:
Point Pleasant Tongue (KY*-subsurface).
Geologic age:
Late Ordovician (Mohawkian to Cincinnatian; Shermanian to Edenian)*
Type section, locality, area and/or origin of name:
Type section: south of Kentucky River in gully a few tens of feet northeast of U.S. Interstate Highway I-75 bridge over river and in roadcuts on northeast side of I-75, Ford quadrangle, Madison Co., KY (Weir and others, 1965).
AAPG geologic province:
Cincinnati arch*
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 ([ ]).