|Name||Continental sedimentary rocks|
|Geologic age||Middle Miocene to Late Miocene|
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Clastic > Siltstone (Bed)
Sedimentary > Clastic > Conglomerate (Bed)
Igneous > Volcanic (Pyroclastic-air fall)
Igneous > Volcanic > Mafic-volcanic > Basaltic-andesite (Flow)
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.
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.
|Counties||Clackamas - Linn - Marion|