State | Oregon |
---|---|
Name | Flows and clastic rocks, undifferentiated |
Geologic age | Miocene |
Lithologic constituents |
Major
Sedimentary > Clastic > Conglomerate (Bed)
Igneous > Volcanic (Volcaniclastic-lahar)
Igneous > Volcanic > Mafic-volcanic > Andesite (Flow, Volcaniclastic-volcanic breccia)
Incidental
Igneous > Volcanic > Mafic-volcanic (Pyroclastic)
Igneous > Volcanic > Felsic-volcanic > Dacite (Flow, Volcaniclastic-volcanic breccia)
Sedimentary > Clastic > Mixed-clastic (Bed)
Igneous > Volcanic > Mafic-volcanic > Basalt (Flow, Volcaniclastic-volcanic breccia)
Igneous > Volcanic > Mafic-volcanic > Basaltic-andesite (Flow, Volcaniclastic-volcanic breccia)
Igneous > Volcanic > Felsic-volcanic (Pyroclastic-air fall, Pyroclastic-ash flow)
|
References | Walker, G.W. and MacLeod, N.S., 1991, Geologic map of Oregon: U.S. Geological Survey, scale 1:500,000.Sutter, J.F., 1978, K-Ar ages of Cenozoic volcanic rocks from the Oregon Cascades west of 121o 30': Isochron/West, no. 21, p. 15-21. |
NGMDB product | |
Counties | Clackamas - Douglas - Hood River - Lane - Linn - Marion - Multnomah |