Usage:
No current usage.
(Rocks of †Newton Mine Volcanics (CA*) reallocated to Copper Hill Volcanics. See Copper Hill.)
Geologic age:
Jurassic*
Type section, locality, area and/or origin of name:
Named from exposures surrounding Newton Mine (6 mi west of Jackson [Sutter Creek 15-min quadrangle] Amador Co., east-central CA). [No type designated] but measured section along Mountain Spring Creek is about 752 feet thick (Heyl and Eric, 1948).
[Newton Mine is on south side of CA Highway 88, in SW/4 sec. 28, T. 6 N., R. 11 E., Lat. 38 deg. 20 min. 31 sec. N., Long. 120 deg. 53 min. 12 sec. W., Ione 7.5-min quadrangle, Amador Co., CA.]
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 ([ ]).