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Mineral Resources > Online Spatial Data > Geology > by state > Oregon

Mafic and intermediate vent rocks (Pliocene? and Miocene)

Basaltic and andesitic agglomerate, breccia, scoria, cinders, flows, and intrusive masses forming lava cones and small shields
StateOregon
NameMafic and intermediate vent rocks (Pliocene? and Miocene)
Geologic ageMiocene to Pliocene
Original map labelTvm?
Primary rock typebasalt
Secondary rock typeandesite
Other rock types
Lithologic constituents
Major
Igneous > Volcanic > Mafic-volcanic > Andesite (Flow)
Igneous > Volcanic > Mafic-volcanic > Basalt (Flow)
Minor
Igneous > Volcanic > Mafic-volcanic > Andesite (Pyroclastic, cinder cone)
Igneous > Volcanic > Mafic-volcanic > Basalt (Pyroclastic, cinder cone)
Igneous > Volcanic > Mafic-volcanic > Andesite (Stock or pipe)
Igneous > Volcanic > Mafic-volcanic > Basalt (Stock or pipe)
Map references
Walker, G.W. and MacLeod, N.S., 1991, Geologic map of Oregon: U.S. Geological Survey, scale 1:500,000.
Unit references
Walker, G.W. and MacLeod, N.S., 1991, Geologic map of Oregon: U.S. Geological Survey, scale 1:500,000.
Geographic coverageLake

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