Usage:
Spar Mountain Sandstone Member of Ste. Genevieve Limestone (IL)
Geologic age:
Middle Mississippian (Visean; early Chesterian)
Type section, locality, area and/or origin of name:
Named from exposures on south slope of Spar Mountain, about 4 mi northwest of town of Cave in Rock, in secs. 3 and 4, T. 12 S., R. 9 E., Hardin Co., IL (Tippie, 1945).
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 ([ ]).