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- Usage in publication:
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- Petrified Spring Tuff*
- Modifications:
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- Named
- Dominant lithology:
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- Rhyodacite
- Tuff
- AAPG geologic province:
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- Great Basin province
Summary:
Named as upper formation of three in Benton Spring Group. Type locality designated as exposures 4 km south of Petrified Spring, NW/4 sec.31 T9N R35E, south Gabbs Valley Range, Mineral Co, NV. Is multiple-flow simple cooling unit of rhyodacite and quartz latite tuff. Is as much as 75 m thick. Overlies Singatse Tuff (new) (Benton Spring Group) or unnamed ash-flow cooling units; underlies Blue Sphinx Tuff (new). Is Oligocene age based on K-Ar age range of 28 to 24 ma.
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 ([ ]).