- Usage in publication:
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- Owyhee rhyolite
- Modifications:
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- Named
- Dominant lithology:
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- Rhyolite
- AAPG geologic province:
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- Snake River basin
Summary:
Name given to rocks formerly called Neocene rhyolite and Tertiary rhyolite. Is part of a very extensive acidic lava series beneath the Snake River downwarp in ID. Extends as scattered remnants into regions bordering the downwarp in UT, NV, MT, and WY. Occurs as a ragged fringe bordering Snake River basalt. Interbedded and underlain by continental deposits of Salt Lake formation. The lava series includes flows of basalt and andesite, trachytes, latites, and rhyolite. Geologic map; rhyolite mapped at southwest edge designated a Pliocene? rhyolite south of the Snake River, Owyhee Co., ID, T1 and 2N, Rs 3, 4, and 5E, in the Snake River basin. Term "Owyhee rhyolite" not shown on map. Has a measured thickness is more than 1,850 ft. Overlies Payette lake beds at some places. No type locality designated.
Source: GNU records (USGS DDS-6; Denver GNULEX).
- Usage in publication:
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- Owyhee Rhyoliteâ€
- Modifications:
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- Abandoned
Summary:
Abandoned in Snake River basin. [Reasons not specified]. Replaced by Idavada Volcanics.
Source: GNU records (USGS DDS-6; Denver GNULEX).
- Usage in publication:
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- Owyhee Rhyolite
- Modifications:
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- Not used
Summary:
Owyhee Basalt not present in report area. Owyhee is a local rhyolite lava flow, partly intrusive and partly extrusive, known only near its type locality.
Source: GNU records (USGS DDS-6; Denver 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 ([ ]).