Usage:
No current usage?
(†Hunter Valley Chert (CA) considered obsolete? Uncertain if used by the CA Geol. Survey. Not used by the USGS.)
Geologic age:
Jurassic, Middle
Jurassic, Late
Type section, locality, area and/or origin of name:
Not stated. Occurs in southern type section of †Amador Group [later abandoned] along Merced River, Tuolumne and Mariposa Cos., CA. Origin of name not stated by author, but probably named from Hunter Valley in eastern part of Coulterville 15-min quadrangle, Mariposa Co., CA (Taliaferro, 1943).
AAPG geologic province:
Sierra Nevada 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 ([ ]).