Usage:
No current usage.
(†Colbert cyclothem (informal) (IL) considered obsolete.)
Geologic age:
Pennsylvanian, Early
Type section, locality, area and/or origin of name:
Type section: 0.5 mi west of Colbert School, in SE/4 SW/4 sec. 23, T. 10 S., R. 7 E., Saline Co., southern IL (Wanless, 1956).
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 ([ ]).