The National Geologic Map Database is migrating to a new infrastructure. We apologize for any service disruptions during this process.
|
|---|
- Usage in publication:
-
- Boreal Ridge basalt
- Modifications:
-
- Geochronologic dating
- Dominant lithology:
-
- Basalt
- AAPG geologic province:
-
- Sierra Nevada province
Summary:
Pg. 4 (table 1), 36. Boreal Ridge basalt. Two flows of hypersthene basalt capping Boreal Ridge, 1 mile north of Beacon Peak, in southeastern part of Donner Pass quadrangle, [Nevada County], eastern California. Age of the Boreal Ridge basalt is Pliocene, based on a radiometric (K-Ar) age on plagioclase of 7.4 +/-0.2 Ma. Report on potassium-argon dating research pertinent to some problems of Cenozoic history of Sierra Nevada.
Sample collected 3,500 feet S. 56 deg. W. from NE/4 sec. 24, T. 17 N., R. 14 E., Donner Pass 15-min quadrangle, at 7,590 ft elevation, [Nevada Co.], eastern CA.
Source: US geologic names lexicon (USGS Bull. 1350, p. 84); GNU records (USGS DDS-6; Menlo GNULEX).
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 ([ ]).