No current usage?
(†Graves Creek Formation (KY) considered abandoned? Uncertain if used by the KY Geol. Survey. Not used by the USGS.)
Pleistocene
On Graves Creek, Webster Co., western KY (Glenn, 1912).
Illinois 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 ([ ]).