State | Oregon |
---|---|
Name | Continental sedimentary rocks |
Geologic age | Middle Miocene to Late Miocene |
Lithologic constituents |
Major
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Clastic > Siltstone (Bed)
Minor
Sedimentary > Clastic > Conglomerate (Bed)
Incidental
Igneous > Volcanic (Pyroclastic-air fall)
Igneous > Volcanic > Mafic-volcanic > Basaltic-andesite (Flow)
|
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.Vokes, H.E., Snavely, P.D., Jr., and Myers, D.A., 1951, Geology of the southern and southwestern border areas of the Willamette valley, Oregon: U.S. Geological Survey Oil and Gas Investigations Map OM-110, scale 1:62,500.https://pubs.er.usgs.gov/publication/om110 McDougall, K., 1980, Paleoecological evaluation of late Eocene biostratigraphic zonations of the Pacific Coast of North America: Society of economic Paleontologists and Mineralogists, Paleontological Monograph, no. 2, 46 p.Lux, D.R., 1982, K-Ar and 40Ar/39Ar ages of mid-Tertiary volcanic rocks from the Western Cascade Range, Oregon: Isochron/West, no. 33, p. 27-32. |
NGMDB product | |
Counties | Clackamas - Linn - Marion |