Usage:
Mattoon Formation of McLeansboro Group (IL*,IN*,KY*)
Subunits:
(alphabetical) --all in IL: Bogota Limestone Member, Bonpas Coal Member, Calhoun Coal Member, Cohn Coal Member, Effingham Limestone Member, Friendsville Coal Member, Gila Limestone Member, Greenup Limestone Member, McClearys Bluff Coal Member, Merom Sandstone Member, Omega Limestone Member, Opdyke Coal Member, Reisner Limestone Member, Shelbyville Coal Member, Shumway Limestone Member, Trowbridge Coal Member, Woodbury Limestone Member.
(alphabetical) --all in IN: Cohn Coal Member, Merom Sandstone Member.
(alphabetical) --all in KY: Dixon Sandstone Member.
Geologic age:
Late Pennsylvanian (Missourian to Virgilian)*
Type section, locality, area and/or origin of name:
Type locality: outcrops in counties of deeper Illinois basin area of southeastern IL. Named from Mattoon, Coles Co., southeastern IL, which lies in general outcrop belt of formation (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 ([ ]).