Usage:
No current usage.
(†Cayuse Limestone (MT*) replaced with Helena Dolomite of Belt Supergroup. See Helena.)
Geologic age:
Mesoproterozoic*
Type section, locality, area and/or origin of name:
Named from Cayuse Creek, tributary of South Fork of Flathead River in northern part of Ovando quadrangle, [in T. 20 N., R. 12 W., Pilot Peak 7.5-min quadrangle, 1994 ed., Powell Co., Flathead National Forest, central western MT], where formation is thickest (Deiss, 1943).
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 ([ ]).