Usage:
No current usage.
(†Clark Mountain Rhyolite of †Middlebrook Group (MO-recognized locally in St. Francois Mountains area) considered abandoned.)
Geologic age:
Precambrian
Type section, locality, area and/or origin of name:
Type area: exposures on Clark Mountain, about 4 mi northeast of Piedmont, in sec. 13, T. 29 N., R. 3 E., and in secs. 17 and 18, T. 29 N., R. 4 E., Wayne Co., MO. Origin of name not stated by authors, but probably named from Clark Mountain (Tolman and Robertson, 1969).
AAPG geologic province:
Midcontinent region
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 ([ ]).