Usage:
Bond Formation of McLeansboro Group (IL*,IN*,KY*)
Subunits:
(alphabetical): Bristol Hill Coal Member (IL), Bunje Limestone Member (IL), Carthage Limestone Member (IL,IN), Coffeen Limestone Member (IL), Fairbanks Coal Member (IN), Flannigan Coal Member (IL), Hall Limestone Member (IL), LaSalle Limestone Member (IL), Little Vermilion Limestone Member (IL), Livingston Limestone Member (IL,IN), McWain Sandstone Member (IL), Millersville Limestone Member (IL), Mount Carmel Sandstone Member (IL), Reel Limestone Member (IL), Riverview Limestone Member (IN), Shoal Creek Limestone Member (IL,IN), Sorento Limestone Member (IL), St. Wendell Sandstone Member (IN), Witt Coal Member (IL).
Geologic age:
Late Pennsylvanian (Kasimovian; Stephanian A-B; Missourian)*
Type section, locality, area and/or origin of name:
Type section (composite): seven exposures (geologic sections 8A-G) in Hillsboro, Mt. Olive, New Douglas, Nokomis, and Pana quadrangles, Bond, Christian, and Montgomery Cos., central western IL. Named from Bond Co., central western IL (Kosanke and others, 1960; see also Tri-State Comm. Corr. Penn. Sys. Illinois Basin, 2001).
Reference section (subsurface): core from Peabody Coal Company drillhole 59, in NW/4 NE/4 NW/4 sec. 33, T. 11 N., R. 1 E., Pana quadrangle, Christian Co., central western IL (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 ([ ]).