U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database

Geologic Unit: Clays Ferry

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 usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).