Usage:
Perth Limestone Member of Staunton Formation of Raccoon Creek Group (IN*)
Geologic age:
Middle Pennsylvanian (Desmoinesian)*
Type section, locality, area and/or origin of name:
Type locality: abandoned strip mine of G. & F. Corp., in SW/4 NE/4 sec. 3, T. 13 N., R. 7 W., Clay Co., southwestern IN, 0.5 mi northwest of town of Perth (Hutchinson, 1960).
AAPG geologic province:
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 ([ ]).