Usage:
Grouse Creek member (informal) of Grande Ronde Basalt of Columbia River Basalt Group (ID*,OR*,WA*)
Grouse Creek member (informal) of Grande Ronde Basalt of /Yakima basalt subgroup [informal] of Columbia River Basalt Group (ID*,OR*,WA*)
Informal. The rank or lithologic term should not be capitalized. [Yakima basalt subgroup considered informal and should not be capitalized. "Subgroup" not recognized as a formal stratigraphic rank term (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). Columbia River Basalt Group adopted by the ID, OR, and WA Geol. Surveys, and the USGS (rules suspended).]
Geologic age:
late Tertiary (early Miocene)*
Type section, locality, area and/or origin of name:
Named after exposures described by Ross (1978, Univ. Idaho PhD thesis) on Grouse Creek in Troy basin area of northeastern OR (see Reidel and others, 1989).
Reference locality: Grouse Creek on north side of Grande Ronde River, [btw. SE/4 sec. 31, T. 7 N., R. 43 E., Saddle Butte 7.5-min quadrangle, Asotin Co., southeastern WA, and NE/4 sec. 23, T. 6 N., R. 43 E., Troy 7.5-min quadrangle, Wallowa Co., northeastern OR] (Reidel and others, 1989).
AAPG geologic province:
Eastern Columbia basin*
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 ([ ]).