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National Geologic Map Database

Geologic Unit: Colbert

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 ([ ]).