Usage:
/St. Francois Mountains Volcanic Supergroup (MO-recognized locally in St. Francois Mountains area)
[Name St. Francois Mountains applied concurrently to two different units in same area; a [supergroup] name combines a geographic name with the term ["supergroup,"] and no lithic designation is included (see ACSN, 1970; NACSN, 1983, 2005, 2021).]
Subunits:
(alphabetical) --all in MO: /Butler Hill Group, /Taum Sauk Group.
Geologic age:
Precambrian
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 ([ ]).