Usage:
Rocky Coulee flow (informal) in basalt of Museum (informal) in Sentinel Bluffs Member of Grande Ronde Basalt of Columbia River Basalt Group (WA-local)
Informal. The rank or lithologic term should not be capitalized. [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: at mouth of Rocky Coulee, just west of Vantage, Kittitas Co., central southern WA. Well exposed in highway cut on east side of Columbia River about 1 mi south of Vantage (Mackin, 1961).
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 ([ ]).