Usage:
/Summit-Frazer Trondhjemitic Gneiss (WA)
Geologic age:
pre-Mississippian
Type section, locality, area and/or origin of name:
Type area: roadcuts along the Loup Loup Pass Highway (WA Highway 20), T. 33 and 34 N., R. 23 and 24 E., western part of the Okanogan Range, Okanogan Co., WA. Named from Summit and Frazer Creeks (Menzer, 1983).
AAPG geologic province:
Northern Cascade Range-Okanagan 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 ([ ]).