Usage:
Umbrella Butte Formation of Windermere Group (ID*)
Umbrella Butte Formation of Windermere Supergroup (ID*)
Windermere Group is preferred usage of the USGS.
Geologic age:
Neoproterozoic and Cambrian(?)*
Type section, locality, area and/or origin of name:
Type section: Umbrella Butte in Gospel Peaks roof pendant, [in SW/4 sec. 15, T. 26 N., R. 4 E., Lat. 45 deg. 35 min. 11 sec. N., Long. 115 deg. 57 min. 10 sec. W.], Hanover Mountain 7.5-min quadrangle, Idaho Co., Nez Perce National Forest, west-central ID (Lund, 2004, fig. A6, loc. 3).
Named for exposures at Umbrella Butte (Lund, 2004).
AAPG geologic province:
Idaho Mountains province*
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 ([ ]).