No current usage.
(†Absher Limestone of Carbondale Group (IL) replaced with St. David Limestone Member of Carbondale Formation. See St. David.)
Middle Pennsylvanian (Desmoinesian)
Named from village in southeastern Williamson Co., southern IL (Weller and others, 1942).
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 ([ ]).