State | Oregon |
---|---|
Name | Ridge-capping basalt and basaltic andesite |
Geologic age | Late Miocene to Pliocene |
Lithologic constituents | Major
Igneous > Volcanic > Mafic-volcanic > Basalt (Flow)
Igneous > Volcanic > Mafic-volcanic > Basaltic-andesite (Flow)
|
Stratigraphic units | Rhododendron Formation |
References | Walker, G.W. and MacLeod, N.S., 1991, Geologic map of Oregon: U.S. Geological Survey, scale 1:500,000.Peck, D.L., Griggs, A.B., Schlicker, H.G., Well, F.G., and Dole, H.M., 1964, Geology of the central and northern parts of the Western Cascade Range in Oregon: U.S. Geolotgical Survey Professional Paper 449, 56 p.McBirney, A.R., Sutter, J.F., Naslund, H.R., Sutton, K.G., and White, C.M., 1974, Episodic volcanism in the central Oregon Cascade Range: Geology, v. 2, p. 585-589.Sutter, J.F., 1978, K-Ar ages of Cenozoic volcanic rocks from the Oregon Cascades west of 121ΓΈ30': Isochron/West, no. 21, p. 15-21. |
NGMDB product | |
Counties | Baker - Clackamas - Crook - Douglas - Harney - Hood River - Jackson - Jefferson - Klamath - Lane - Linn - Marion - Wasco - Washington - Yamhill |