Usage:
/St. Francois Mountains Intrusive Suite (MO-recognized locally in St. Francois Mountains area)
[Name St. Francois Mountains applied concurrently to two different units of same area (see ACSN, 1970; NACSN, 1983, 2005, 2021).]
Subunits:
Hypabyssal units (alphabetical) --all in MO: Brown Mountain Rhyolite Porphyry, Buford Granite Porphyry, Carver Creek Granite Porphyry, Munger Granite Porphyry.
Plutonic units (alphabetical) --all in MO: Breadtray Granite, Butler Hill Granite, Graniteville Granite, Knoblick Granite, Silvermine Granite, Slabtown Granite, Stono Granite.
Geologic age:
Mesoproterozoic
Type section, locality, area and/or origin of name:
Not designated, though is presumably in St. Francois Mountains in southeast MO. Origin of name not stated by author, but probably named from St. Francois Mountains (Kisvarsanyi, 1976).
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 ([ ]).