Usage:
Altyn Formation of Belt Supergroup (MT*-recognized locally on east side of Glacier National Park area)
In the Clark Range of Alberta and British Columbia, Canada, the Altyn is a formation of Purcell Supergroup (=Belt Supergroup of U.S.).
Subunits:
(alphabetical); Carthew Member (MT), Hell Roaring Member (MT).
Geologic age:
Mesoproterozoic*
Type section, locality, area and/or origin of name:
Type locality: in cliffs of Appekunny Mountain, between 6,000 and 7,400 feet above sea, due north of Altyn, in Swift Current Valley, Glacier National Park, Glacier Co., northwestern MT (Willis, 1902).
Entire section exposed only in Waterton Lakes National Park (Alberta and British Columbia, Canada), where it is complicated by faults and folds.
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 ([ ]).