Marvin H. Beeson

Date of Award


Document Type


Degree Name

Master of Science (M.S.) in Geology


Earth Science

Physical Description

1 online resource (72 p.)


Geochemistry -- Oregon -- Mount Hood




The Miocene Rhododendron and Dalles Formations in the Mount Hood area are accumulations of chiefly pyroclastic andesitic material, largely confined to the Dalles-Mount Hood syncline. These very similar units are geographically separated by overlying andesites including the present Mount Hood cone, and past workers (Hodge 1938, Wise 1969) have suspected that they may share a common source. Prior to this study, few geochemical data were available for the Rhododendron and the Dalles Formations, compared to the well studied Columbia River basalts underlying them and the overlying Pliocene andesites. This geochemical study was designed to investigate certain aspects of the Rhododendron and Dalles Formations such as their possible common source, how they differ chemically from other andesites in the area, and how they fit into the chemical evolution of the Cascade Mountains.


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This thesis includes supplemental content available to download.

Persistent Identifier

figure1part1.pdf (3681 kB)
Sample locations in the Mt. Hood area

figure1part2.pdf (2299 kB)
Sample locations in The Dalles area