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National Geologic Map Database

Geologic Unit: Cohn

Usage:

Cohn Coal Member of Mattoon Formation of Mcleansboro Group (IL,IN)


Geologic age:

Late Pennsylvanian (Missourian)


Type section, locality, area and/or origin of name:

Type locality: on south side of Big Creek, in NE/4 sec. 1, T. 11 N., R. 12 W., Marshall 15-min quadrangle, Clark Co., eastern IL. Exposure is about 2.5 mi northwest of Cohn, now called Livingston (Kosanke and others, 1960; coal named by Newton and Weller (1937, Illinois Geol. Survey Rpt. Inv., no. 45, p. 18; see also Willman and others, 1975).


AAPG geologic province:

Illinois basin


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).