Portland State University. Department of Earth Sciences
Michael L. Cummings
Date of Publication
Master of Science (M.S.) in Geology
Bauxite -- Oregon -- Marion County
1 online resource (143 p.)
Pacific Northwest ferruginous bauxite deposits have formed in four main areas of northwestern Oregon and southwestern Washington by laterization of flows of the Columbia River Basalt Group (CRBG). The deposits, averaging 36.3% Al2O3 , 31.8% Fe2O3 , and 5.9% Sio2, generally occur near the surface of hilltops in gently rolling areas. Two very different views have been advanced regarding the setting in which the deposits have formed. The first hypothesis calls for a blanket-type laterization by erosion of much of the original deposit upon uplift and dissection of the area.
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Hoffman, Charles William, "A stratigraphic and geochemical investigation of ferruginous bauxite deposits in the Salem Hills, Marion County, Oregon" (1981). Dissertations and Theses. Paper 3201.