| State | Oregon |
|---|---|
| Name | Mixed rocks |
| Geologic age | Paleozoic to Mesozoic |
| Lithologic constituents |
Major
Metamorphic > Metaigneous > Greenstone (Greenschist)
Metamorphic > Metasedimentary (Greenschist)
Igneous > Plutonic > Gabbroic > Gabbro (Melange)
Minor
Sedimentary > Carbonate > Limestone (Bed)
Sedimentary > Chemical > Chert (Bed)
|
| Comments | Includes blueschist. Pennsylvanian and Permian fusilinids have been identified in some blocks of limestone (M.K. Nestell, personal commun., 1993) |
| 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.https://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. |
| NGMDB product | |
| Counties | Baker - Malheur |