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National Geologic Map Database

Geologic Unit: Mutual

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:

Late Proterozoic*


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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).