Usage:
No current usage.
(†Sturgis Formation (KY) replaced with McLeansboro Group. See McLeansboro.)
Geologic age:
Middle to Late Pennsylvanian
Type section, locality, area and/or origin of name:
Type area and composite section (subsurface): Peabody Coal Company coreholes P-47 and P-49, about 5 mi northeast of Sturgis, Sturgis 7.5-min quadrangle, Union Co., western KY, and Cities Service Oil Company stratigraphic test hole 1801 at Camp Breckinridge, about 3 mi northeast of hole P-49, Bordley 7.5-min quadrangle, Union Co., western KY (Kehn, 1973).
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 ([ ]).