- Usage in publication:
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- Pyramid Lake Member
- Modifications:
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- Named
- AAPG geologic province:
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- Great Basin province
Summary:
Unit is named the Pyramid Lake Member of the Mount Mazama Formation. Is exposed in the Lake Lahontan area, NV and CA. Contains five tephra beds (ascending): Pelican Island, Timber Lake, Wono, Leter Ranch, Trego Hot Springs Beds. All are inferred to represent the products of a single body of magma what was becoming progressively more potassium rich and differentiated, and whose source was Mount Mazama. Beds are intercalated with the lower member of the Sehoo Formation. Age is Pleistocene, 35 to 11.5 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.
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