No current usage.
(†Owyhee Rhyolite (ID,OR) replaced with Idavada Volcanics. See Idavada.)
Tertiary
Miocene
Pliocene
Not designated (Kirkham, 1931).
Snake River 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 ([ ]).