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Geologic Unit: Colbert
Map showing publication footprint
  • Usage in publication:
    • Colbert cyclothem
  • Modifications:
    • Original reference
  • AAPG geologic province:
    • Illinois basin
Publication:

Wanless, H.R., 1956, Classification of the Pennsylvanian rocks of Illinois as of 1956, [with Correlation chart compiled by Raymond Siever]: Illinois Geological Survey Circular, no. 217, 14 p.


Summary:

Pg. 5, pl. 1. Colbert cyclothem. Substituted for former cyclothem name, Davis, because latter name is preempted. Underlies Dekoven cyclothem; overlies Stonefort cyclothem. Includes Davis coal bed which name is retained.
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.

Source: US geologic names lexicon (USGS Bull. 1200, p. 877).


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 ([ ]).

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