No current usage?
(†Belmont Porphyry (MT*) considered abandoned? Uncertain if used by the MT Geol. Survey. Abandoned by the USGS.)
Tertiary*
Type locality not stated. Mapped on and around Mount Belmont, 1 mi west of Marysville. Origin of name not stated by author, but probably named from Mount Belmont, Lewis and Clark Co., central western MT (Barrell, 1907).
Montana folded belt*
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 ([ ]).