Usage:
Litchfield Coal Member of Tradewater Formation of Raccoon Creek Group (IL-local)
Geologic age:
Middle Pennsylvanian (Desmoinesian)
Type section, locality, area and/or origin of name:
Type locality: mine [just northeast of village of Litchfield], in SE/4 NE/4 NE/4 sec. 32, T. 9 N., R. 5 W., Mount Olive 15-min quadrangle, Montgomery Co., southwestern IL. Recognized only in vicinity of mines near Litchfield (Kosanke and others, 1960; name credited to Kay, 1915).
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 ([ ]).