Usage:
Partridge shale member (informal) of Grundy Formation of Breathitt Group (KY)
Notable exposures in Big Sandy district.
Geologic age:
late Early Pennsylvanian (Bashkirian; Westphalian A; late Morrowan)
Type section, locality, area and/or origin of name:
[Notable exposures in Big Sandy district, eastern KY. Type locality not designated. Origin of name not stated by author (Chesnut, 1991).]
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 ([ ]).