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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).