Usage:
Red Gap Member of Grinnell Formation of Ravalli Group of Belt Supergroup (MT-local)
Recognized in Glacier National Park and adjacent areas, Glacier Co.
Geologic age:
Mesoproterozoic
Type section, locality, area and/or origin of name:
Origin of name not stated. Forms mass of Mount Rockwell, in Two Medicine Valley, Glacier National Park, Glacier Co., northwestern MT (Fenton and Fenton, 1931).
Type locality: mountain between Red Gap and Ptarmigan Wall, Glacier National Park. Typically developed in Lewis Range, north of Many Glaciers (Fenton and Fenton, 1937).
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 ([ ]).