Usage:
Hellgate Quartzite Member of Miller Peak Formation of Missoula Group of Belt Supergroup (MT*-local)
Geologic age:
Mesoproterozoic*
Type section, locality, area and/or origin of name:
Type section: [east of campus of the Univ. of Montana-Missoula], on north side of Mount Sentinel, the south wall of Hellgate Canyon, [in W/2 sec. 26 and E/2 sec. 27, T. 13 N., R. 19 W., Southeast Missoula 7.5-min quadrangle, Missoula Co., western MT] (Clapp and Deiss, 1931).
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 ([ ]).