Mixed rocks (Mesozoic and Paleozoic) (ORmr;0)

State	Oregon
Name	Mixed rocks (Mesozoic and Paleozoic)
Geologic age	Paleozoic to Mesozoic
Original map label	mr
Comments	Includes blueschist. Pennsylvanian and Permian fusilinids have been identified in some blocks of limestone (M.K. Nestell, personal commun., 1993)
Primary rock type	serpentinite
Secondary rock type	gabbro
Other rock types	chert
Lithologic constituents	Minor Sedimentary > Carbonate > Limestone (Bed) Sedimentary > Chemical > Chert (Bed)
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. Walker, G.W., 1977, Geologic map of Oregon east of the 121st meridian: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-902, scale 1:500,000. [http://pubs.er.usgs.gov/publication/i902] Wolff, E.N., 1965, The geology of the northern half of the Caviness quadrangle, Oregon: Eugene, University of Oregon, Ph.D. dissertation, 214 p. Swisher, C.C., Ach, J.A., and Hart, W.K., 1990, Laser fusion 40Ar/39Ar dating of the type Steens Mountain Basalt, southeastern Oregon, and the age of the Steens aeromagnetic polarity transition [abs.]: EOS, Transactions of American Geophysical Union, v. 17, no. 43, p. 1,296. Prostka, H.J., 1968, Geologic map of the Ironside 15' quad, Oregon: Oregon Department of Geology and Mineral Industries, scale 1:62,500.
Geographic coverage	Baker - Malheur