No current usage.
(Rocks of †/Flathead Shale (MT,WY), or †/Flathead Formation (MT,WY), reallocated to Gros Ventre Formation. See Gros Ventre.)
[Preoccupied. Name previously applied to Flathead Quartzite by Peale (1893) in same area.]
Middle Cambrian
Named from exposures in Flathead Pass, northeastern corner Threeforks [Three Forks] quadrangle, MT (Peale, 1893).
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 ([ ]).