No current usage.
(†Alpreston Quartzite (MT*) considered same as Flathead Quartzite. See Flathead.)
Middle Cambrian
Type locality not designated. Forms crest of hill west of Elkhorn, Jefferson Co., western central MT. [This hill is also to west of Alpreston Gulch]. Origin of name not stated by author, but probably named from Alpreston Gulch near Elkhorn, Jefferson Co., MT (Weed, 1901).
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 ([ ]).