- Usage in publication:
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- Bald Mountain olivine latite member (informal)
- Modifications:
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- Original reference
- Dominant lithology:
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- Latite
- AAPG geologic province:
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- Sierra Nevada province
Summary:
Pg. 1453-1464. Bald Mountain olivine latite member of Lousetown Formation. Age of Bald Mountain olivine latite relative to Big Chief basalt (new) difficult to ascertain. The two flows are presently considered close in age with Bald Mountain slightly younger. Potassium-argon age of Bald Mountain 1.2 [Ma]. Older than Hirschdale olivine basalt (new) on stratigraphical and structural evidence. At least 20 flows (or groups of flows) recognized in Truckee area, north of Lake Tahoe. Nine flows (or groups of flows) named and given informal member status in Lousetown Formation. Age is early Pleistocene.
Mapped in vicinity of Bald Mountain, northeastern CA. [Named from outcrops on Bald Mountain, east of Upper Truckee Canyon, in sec. 27, T. 17 N., R. 16 E., Placer Co., northeastern CA.]
Source: US geologic names lexicon (USGS Bull. 1350, p. 43); supplemental information from 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 ([ ]).