Usage:
Eureka Valley Tuff of Stanislaus Group (CA*,NV*)
Eureka Valley Tuff (CA)
Eureka Valley Member of Stanislaus Formation (CA,NV)
Subunits:
FORMATION STATUS (alphabetical) --all in CA*,NV*: By-Day Member, Tollhouse Flat Member.
Geologic age:
late Tertiary (late Miocene)*
Type section, locality, area and/or origin of name:
Type locality: ridge between Bald Peak and Red Mountain, Dardanelles Cone and Sonora Pass 15-min quadrangles, Tuolumne Co., CA (Slemmons, 1966).
AAPG geologic province:
Sierra Nevada province*
Great Basin 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 ([ ]).