Mafic and intermediate vent rocks

Basaltic and andesitic agglomerate, breccia, scoria, cinders, flows, and intrusive masses forming lava cones and small shields
State Oregon
Name Mafic and intermediate vent rocks
Geologic age Miocene to Pliocene
Lithologic constituents
Major
Igneous > Volcanic > Mafic-volcanic > Basalt (Flow, Stock or pipe, Pyroclastic-cinder cone)
Igneous > Volcanic > Mafic-volcanic > Andesite (Flow, Stock or pipe, Pyroclastic-cinder cone)
References

Walker, G.W. and MacLeod, N.S., 1991, Geologic map of Oregon: U.S. Geological Survey, scale 1:500,000.

NGMDB product
Counties Lake