- Usage in publication:
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- Tsoyawata Bed
- Modifications:
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- Named
- AAPG geologic province:
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- Great Basin province
Summary:
Unit is named the Tsoyawata Bed of the Mazama Member (new) of the Mount Mazama Formation. Is exposed in the Lake Lahontan area of NV and CA. Occurs at Virgin Creek, Lone Mountain, and Stillwater, NV, and west of the crest of the Sierra Nevada and south to Lake Tahoe, CA. Is the lower bed of the Mazama and Consists of 5 cm of white tephra containing masses of small green hornblende laths. Overlies the Osgood Bed (new) at Osgood Swamp, CA. Age is Holocene, 7 ka. (B1565)
Source: 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 ([ ]).