Usage:
Mutual Formation of Brigham Group (ID*,UT*)
Mutual Formation (ID*)
Mutual Quartzite (ID*,UT*)
Subunits:
(alphabetical): Box Canyon Member (UT), Talawag Member (UT).
Geologic age:
Neoproterozoic*
Type section, locality, area and/or origin of name:
Not designated. Named from Mutual Mine, near Big and Little Cottonwood Canyons, Salt Lake Co., UT (Granger and others, 1952).
AAPG geologic province:
Great Basin region*
Northern Rocky Mountain region*
Southern Rocky Mountain 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 ([ ]).