Usage:
No current usage.
(†Hole-in-the-Wall Member of †Boulder Pass Formation (MT) replaced with Spokane Formation of the †Piegan Group [†Piegan later abandoned]. See Spokane.)
Geologic age:
Mesoproterozoic*
Type section, locality, area and/or origin of name:
Not designated. Origin of name not stated by authors, but probably named from Hole-in-the-Wall Falls in Glacier National Park, Flathead Co., northwestern MT (Fenton and Fenton, 1931).
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 ([ ]).