- Usage in publication:
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- Mazama Member
- Modifications:
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- Named
- AAPG geologic province:
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- Great Basin province
Summary:
Unit is named the Mazama Member of the Mount Mazama Formation. Is exposed in the Lake Lahontan area of Nevada and California. Comprises at least three tephra beds, two of which are named the Tsoyawata Bed (new) and Mazama Bed, formed during the eruptions that led to the collapse of Mount Mazama at about 7 ka. Age is Holocene. [The unit here named the Mazama Bed is described in the literature as the informally named Mazama ash, and is widely distributed throughout the western United States and Canada.]
Source: US geologic names lexicon (USGS Bull. 1565, p. 194-195); 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 ([ ]).