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National Geologic Map Database

Geologic Unit: Herrin

Usage:

Herrin Coal Member of Carbondale Formation (IL*)
Herrin coal bed (informal) of Carbondale Formation (KY*)
Herrin Coal Member of Dugger Formation of Carbondale Group (IN*)
Also called No. 6 coal (informal).

For informal usage, the rank or lithologic term should not be capitalized.


Geologic age:

Middle Pennsylvanian (Desmoinesian)*


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

In mines in vicinity of Herrin, Williamson Co., southern IL (Worthen, 1870; Kosanke and others, 1960).


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