Advisor

Marvin H. Beeson

Date of Award

1981

Document Type

Thesis

Degree Name

Master of Science (M.S.) in Geology

Department

Earth Science

Physical Description

1 online resource (167 p.)

Subjects

Basalt -- Oregon -- Multnomah County, Basalt -- Oregon -- Clackamas County, Stratigraphic Geology

DOI

10.15760/etd.3258

Abstract

Approximately 150 meters (500 feet) of Grande Ronde Basalt and 140 meters (450 feet) of Wanapum Basalt of the Columbia River Basalt Group are exposed in the Bull Run Watershed. In Bull Run, the Grande Ronde Basalt is divided into three mappable units: "low Mg" R2 (at least one flow), "low Mg" N2 (approximately four flows), and "high Mg" N2 (two to three flows}. The Wanapum Basalt is represented by two members: Frenchman Springs Member (six flows) and Priest Rapids Member (one flow). These units are identified by instrumental neutron activation analysis, paleomagnetism based on measurements with a fluxgate magnetometer, petrography, lithology, jointing, and stratigraphic position.

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

Persistent Identifier

http://archives.pdx.edu/ds/psu/18754

vogt1.pdf (11517 kB)
Map of the Geology of the Columbia River Basalt Group in the Bull Run Watershed, Oregon

vogt2.pdf (9404 kB)
Cross sections, Bull Run Watershed, Oregon

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