Portland State University PDXScholar Dissertations and Theses Dissertations and Theses 1981 A stratigraphic and geochemical investigation of ferruginous bauxite deposits in the Salem Hills, Marion County, Oregon Charles William Hoffman Portland State University Follow this and additional works at: https://pdxscholar.library.pdx.edu/open_access_etds Part of the Geochemistry Commons, and the Stratigraphy Commons Let us know how access to this document benefits ou.y Recommended Citation 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. https://doi.org/10.15760/etd.3192 This Thesis is brought to you for free and open access. It has been accepted for inclusion in Dissertations and Theses by an authorized administrator of PDXScholar. Please contact us if we can make this document more accessible:
[email protected]. AN ABSTRACT OF THE THESIS OF Charles William Hof frnan for the Master of Science in Geology presented June 10, 1981. Title: A Stratigraphic and Geochemical Investigation of Ferruginous Bauxite Deposits in the Salem Hills, Marion County, Oregon. APPROVED BY MEMBERS OF THE THESIS COMMITTEE: Pacific Northwest ferruginous bauxite deposits have formed in four main areas of northwestern Oregon and south western Washington by laterization of flows of the Columbia River Basalt Group (CRBG). The deposits, averaging 36.3% Al o , 31.8% Fe o , and 5.9% Sio , generally occur near 2 3 2 3 2 the surface of hilltops in gently rolling areas. Two very different views have been advanced regarding the setting in which the deposits have formed.