Usage:
No current usage.
(Rocks of †McCormick Group (IL*) reallocated to Raccoon Creek Group. See Raccoon Creek.)
Subunits:
(alphabetical; of Kosanke and others, 1960) --all in IL: Abbott Formation, Caseyville Formation, Tradewater Formation.
Geologic age:
Pennsylvanian, Middle*
Type section, locality, area and/or origin of name:
Vicinity of McCormick, northwestern part of Pope Co., 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 ([ ]).