State | Oregon |
---|---|
Name | Youngest basalt and basaltic andesite |
Geologic age | Holocene |
Lithologic constituents |
Major
Igneous > Volcanic > Mafic-volcanic > Basaltic-andesite (Flow)
Minor
Igneous > Volcanic > Mafic-volcanic > Basalt (Flow)
Incidental
Igneous > Volcanic > Felsic-volcanic > Rhyolite (Pyroclastic-air fall)Mazama ash
|
Comments | Unit also occurs in eastern Oregon. |
References | Walker, G.W. and MacLeod, N.S., 1991, Geologic map of Oregon: U.S. Geological Survey, scale 1:500,000.Walker, G.W. and Repenning, C.A., 1966, Geologic map of the west half of the Jordan Valley quadrangle, Malheur County, Oregon: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-457, scale 1:250,000.https://pubs.er.usgs.gov/publication/i457 Ferns, M.L., Evans, J.G., and Cummings, M.L., 1993a, Geologic map of the Mahogany Mountain 30 x 60 minute quadrangle, Malheur County, Oregon: Oregon Department of Geology and Mineral Industries Geological Map Series GMS-78, scale 1:100,000.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 Hart, W.K. and Mertzman, S.A., 1983, Late Cenozoic volcanic stratigraphy of the Jordan Valley area, southeastern Oregon: Oregon Geology, v. 45, no. 1, p. 15-19.Ferns, M.L., 1992, Preliminary geologic map of the Bogus Bench quadrangle, Malheur County, Oregon: Oregon Department of Geology and Mineral Industries Open-File Map O-92-02, scale 1:24,000.Ferns, M.L. and Macleod, N.S., 1992, Preliminary geologic map of the Cow Lakes quadrangle, Malheur County, Oregon: Oregon Department of Geology and Mineral Industries Open-File Map O-92-06, scale 1:24,000.Ferns, M.L.1992, Preliminary geologic map of the Downey Canyon quadrangle, Malheur County, Oregon: Oregon Department of Geology and Mineral Industries Open-File Map O-92-07, scale 1:24,000. |
NGMDB product | |
Counties | Clackamas - Crook - Deschutes - Douglas - Hood River - Jefferson - Klamath - Lake - Lane - Linn - Malheur - Wasco |