- Usage in publication:
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- Weiser Basalt
- Modifications:
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- Named
- AAPG geologic province:
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- Snake River basin
Summary:
Unit is named the Weiser Basalt of the Columbia River Basalt Group. Includes post-Grande Ronde basalt flows in the Weiser embayment. Is characterized by pumice breccia, scoria, volcaniclastic debris, and ash. Four informal members are defined on the basis of combined outcrop characteristics and unconformable relations with the underlying Imnaha and Grande Ronde flows. From oldest to youngest these members are the basalts of Cambridge, Sugarloaf, Star Butte, and the geographically isolated basalt of Black Canyon. Age is middle and late Miocene . (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 ([ ]).