Usage:
Boreal Ridge basalt (informal) (CA-recognized locally in Donner Pass area)
Informal. The rank or lithologic term should not be capitalized.
Geologic age:
late Tertiary (Pliocene)
Type section, locality, area and/or origin of name:
Notable exposures capping Boreal Ridge, 1 mile north of Beacon Peak, in southeastern part of Donner Pass 15-min quadrangle, [Nevada Co.], eastern CA. Sample collected 3,500 ft S. 56 deg. W. from NE/4 sec. 24, T. 17 N., R. 14 E., at 7,590 ft elevation (Dalrymple, 1964).
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 ([ ]).