Usage:
McLeansboro Group (IL*,IN*,KY*)
McLeansboro Formation (IL*,IN*)
Geologic age:
Middle to Late Pennsylvanian (Desmoinesian to Virgilian)*
Type section, locality, area and/or origin of name:
Type locality: in SE/4 SW/4 SW/4 NE/4 sec. 25, T. 4 S., R. 5 E., McLeansboro quadrangle, Hamilton Co., southern IL. Named from McLeansboro, Hamilton Co., southern IL (US geologic names lexicons, USGS Bull. 896, 1200; see also Kosanke and others, 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 ([ ]).