Usage:
Wilbur Creek Member of Saddle Mountains Basalt of Columbia River Basalt Group (ID*,WA*)
Wilbur Creek Member of Saddle Mountains Basalt of /Yakima basalt subgroup [informal] of Columbia River Basalt Group (ID*,WA*)
[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 (middle Miocene)*
Type section, locality, area and/or origin of name:
Type locality: series of roadcuts along Wilbur Creek, in sec. 9 and SW/4 SW/4 sec. 4, T. 14 N., R. 44 E., about 7 km west of Pullman, Ewartsville quadrangle, Whitman Co., southeastern WA, [approx. Lat. 46 deg. 43 min. 30 sec. N., Long. 117 deg. 17 min. 20 sec. W.] (Swanson and others, 1979).
Reference locality (Camp, 1976): in roadcuts in the Cloverland Grade section, from 506 to 540 m (1,660 to 1,770 ft) elevation, in NW/4 SW/4 sec. 25 and NE/4 SE/4 sec. 26, T. 10 N., R. 45 E., Asotin quadrangle, Asotin Co., southeastern WA, [approx. Lat. 46 deg. 18 min. 51 sec. N., Long. 117 deg. 07 min. 23 sec. W.] (Swanson and others, 1979, citing Camp, 1976).
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 ([ ]).