Usage:
Lemhi Group (ID*)
Lemhi Quartzite (MT)
Subunits:
(alphabetical): Apple Creek Formation (ID*), Big Creek Formation (ID*), Gunsight Formation (ID*), Inyo Creek Formation (ID*), West Fork Formation (ID*).
Geologic age:
Mesoproterozoic*
Type section, locality, area and/or origin of name:
Not designated. Exposed only in T. 14 N., R. 24 E., and in adjoining parts of Lemhi Range, Lemhi Co., ID. Named from the Lemhi Range, Custer and Lemhi Cos., ID (Ross, 1947).
AAPG geologic province:
Northern 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 ([ ]).