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Geologic Unit: Calhoun
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Map showing publication footprint
  • Usage in publication:
    • Calhoun limestone
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Limestone
  • AAPG geologic province:
    • Illinois basin
Publication:

Weller, J.M., Henbest, L.G., and Dunbar, C.O., 1942, Stratigraphy of the fusuline-bearing beds of Illinois, IN Dunbar, C.O., and Henbest, L.G., Pennsylvanian Fusulinidae of Illinois: Illinois Geological Survey Bulletin, no. 67, p. 9-34., [1943]


Summary:

Pg. 27. Calhoun limestone. Lenticular bed with maximum thickness of about 3 feet which overlies persistent coal in Richland and Lawrence Counties, southeastern Illinois. Light-gray, more or less argillaceous, and locally grades laterally into calcareous sandy shale. Provisionally correlated with Omega limestone.
Named from Calhoun, Richland Co., southeastern IL.

Source: US geologic names lexicon (USGS Bull. 1200, p. 580).


Map showing publication footprint
  • Usage in publication:
    • Calhoun limestone
  • Modifications:
    • Not used
  • AAPG geologic province:
    • Illinois basin
Publication:

Kosanke, R.M., Simon, J.A., Wanless, H.R., and Willman, H.B., 1960, Classification of the Pennsylvanian strata of Illinois: Illinois Geological Survey Report of Investigations, no. 214, 84 p.


Summary:

Pg. 41. Calhoun limestone. Replaced with Bonpas limestone member of Mattoon formation (both new) of McLeansboro group. Name Calhoun restricted to underlying coal.

Source: US geologic names lexicon (USGS Bull. 1200, p. 580).


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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