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Data Sources
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BASEMAPS
Default Weather
Temperature
Smoke
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WEATHER
Porphyritic basalt (ORTpb;0)
Geologic Formation
in
OR
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Lithology
Dacite
Dacite
Basalt
Geologic Age
Late Eocene (37.8 Ma – 33.9 Ma ago)
Geologic Unit Label
Tpb
Subaerial lava flows and breccia of porphyritic basalt, minor basaltic andesite, and rare dacite. Includes basalt of Cascade Head (Wells and others, 1983), Yachats Basalt (Snavely and others, 1976c) and Goble Volcanic Series (Warren and others, 1945). Also includes camptonitic extrusive rocks (tuff breccia, lapilli tuff, and minor pillow flows) interbedded in Nestucca Formation
—
USGS
Taxonomy
Classified As
Geologic Formation
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