Usage:
Silvermine Granite of /St. Francois Mountains Intrusive Suite (MO-recognized locally in St. Francois Mountains area)
[Name St. Francois Mountains applied concurrently to two different units in same area (see ACSN, 1970; NACSN, 1983, 2005, 2021).]
Geologic age:
Precambrian
Type section, locality, area and/or origin of name:
Type area: near Silver Mine, in sec. 10, T. 33 N., R. 5 E., Madison Co., MO. Origin of name not stated by authors, but probably named from mine (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 ([ ]).