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Data Sources
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BASEMAPS
Default Weather
Temperature
Smoke
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WEATHER
Silicic vent rocks (ORTvs;0)
Geologic Formation
in
OR
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Lithology
Dacite
Rhyolite
Geologic Age
Eocene – Pliocene (56 Ma – 2.58 Ma ago)
Geologic Unit Label
Tvs
Plugs and domal complexes of rhyolitic, rhyodacitic, and dacitic composition; includes related near-vent flows, flow breccia, and deposits of obsidian, perlite, and pumice. Locally includes resurgent domes related to caldera complexes. In southeast Oregon many domal complexes younger than 11 Ma exhibit a well-defined southeast to northwest age progression (Walker, 1974; MacLeod and others, 1976) from about 11 Ma to less than 1 Ma
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USGS
Taxonomy
Classified As
Geologic Formation
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