Usage:
Grangeville Member of Saddle Mountains Basalt of Columbia River Basalt Group (ID-local)
[Columbia River Basalt Group adopted by the ID, OR, and WA Geol. Surveys, and the USGS (rules suspended).]
Geologic age:
late Tertiary (late Miocene)
Type section, locality, area and/or origin of name:
Type locality: Grangeville, near South Fork of Clearwater River, [Grangeville East 7.5-min quadrangle], Idaho Co., ID (Camp, 1981).
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 ([ ]).