Usage:
No current usage.
(Rocks of †Gateway Formation (MT-local) reallocated to Mount Shields Formation of Missoula Group of Belt Supergroup. See Mount Shields.)
Geologic age:
Mesoproterozoic
Type section, locality, area and/or origin of name:
Notable exposures just south of Canadian border, on heights east of Gateway and overlooking Tobacco Plains, [Lincoln Co., Kootenai National Forest], northwestern MT (Daly, 1913).
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 ([ ]).