First Advisor

Marvin H. Beeson

Date of Publication


Document Type


Degree Name

Master of Science (M.S.) in Geology


Earth Science




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



Physical Description

1 online resource (167 p.)


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.


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This thesis includes supplemental content

Persistent Identifier

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