Usage:
Gentry Coal Bed of Drury Member of Caseyville Formation of Raccoon Creek Group (IL-local)
Geologic age:
Pennsylvanian, Early
Morrowan
Type section, locality, area and/or origin of name:
In sec. 26, T. 11 S., R. 10 E., southwestern Hardin Co., southeastern 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 ([ ]).