No current usage.
(†Earlham Limestone (IA,KS,MO) is same as Bethany Falls Limestone Member of Swope Limestone of Bronson Group. See Bethany Falls.)
Pennsylvanian
Quarried at Earlham, Madison Co., western IA, hence the name (Bain, 1897).
Iowa shelf
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 ([ ]).