Advisor

Michael L. Cummings

Date of Award

1981

Document Type

Thesis

Degree Name

Master of Science (M.S.) in Geology

Department

Earth Science

Physical Description

1 online resource (143 p.)

Subjects

Bauxite -- Oregon -- Marion County

DOI

10.15760/etd.3192

Abstract

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.

Description

If you are the rightful copyright holder of this dissertation or thesis and wish to have it removed from the Open Access Collection, please submit a request to pdxscholar@pdx.edu and include clear identification of the work, preferably with URL

This thesis includes supplemental content available to download.

Persistent Identifier

http://archives.pdx.edu/ds/psu/18440

hoffman2.pdf (3600 kB)
Geologic Map of the Columbia River Basalt Group Salem Hills, Oregon

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