Usage:
Bachelor Formation (AR,MO*)
Bachelor Sandstone (IL)
Geologic age:
Early Mississippian (Kinderhookian)
Type section, locality, area and/or origin of name:
Type locality: in stream bed, in SE/4 NW/4 SW/4 sec. 9, T. 48 N., R. 8 W., Callaway Co., MO. Named from exposures to east, west, and south of Bachelor (Mehl, 1960; see also MO Geol. Survey lexicon, Thompson, 2001).
AAPG geologic province:
Illinois basin
Ozark uplift
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 ([ ]).