Continental sedimentary rocks (upper and middle Miocene) (ORTcss;0)

State	Oregon
Name	Continental sedimentary rocks (upper and middle Miocene)
Geologic age	Middle Miocene to Late Miocene
Original map label	Tcss
Primary rock type	siltstone
Secondary rock type	sandstone
Other rock types	conglomerate; tuff; mafic volcanic rock
Lithologic constituents	Major Sedimentary > Clastic > Sandstone (Bed) Sedimentary > Clastic > Siltstone (Bed) Minor Sedimentary > Clastic > Conglomerate (Bed) Incidental Igneous > Volcanic > Mafic-volcanic > Basaltic-andesite (Flow) Igneous > Volcanic (Pyroclastic, air fall)
Map references	Walker, G.W. and MacLeod, N.S., 1991, Geologic map of Oregon: U.S. Geological Survey, scale 1:500,000.
Unit 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. [http://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.
Geographic coverage	Clackamas - Linn - Marion