Usage:
Mount Shields Formation of Missoula Group of Belt Supergroup (ID*,MT*)
Mount Shields Formation of Belt Supergroup (MT)
Originally called Shields.
Geologic age:
Mesoproterozoic*
Type section, locality, area and/or origin of name:
Type section: along ridge between Mount Shields and Blacktail Mountain, Flathead Co., MT. Named from Mount Shields Mountain (Childers, 1963).
Reference section: along crest of ridge parallel to and northwest of Camp Creek, in secs. 22, 28, and 33, T. 20 N., R. 12 W., Lewis and Clark Range, Powell Co., MT (McGill and Sommers, 1967).
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 ([ ]).