Advisor

Marvin H. Beeson

Date of Award

1978

Document Type

Thesis

Degree Name

Master of Science (M.S.) in Geology

Department

Earth Science

Physical Description

1 online resource (149 p.)

Subjects

Basalt -- Oregon, Geology -- Oregon, Stratigraphic geology

DOI

10.15760/etd.5395

Abstract

The Clackamas River drainage within the western Cascade Range is approximately aligned with a northwest trending lineation defined by the Portland Hills and the Brothers Fault zone. This area is occupied by an extensive Columbia River Basalt sequence that is deeply incised by the Clackamas River and its tributaries. Two major basalt units of the Yakima Basalt Subgroup, including the Grande Ronde Basalt and the Frenchman Springs Member of the Wanapurn Basalt, are distinguishable in a 515 meter to 550 meter accumulation. Of particular interest is the presence of five trending right-lateral strike-slip faults is consistent with a stress model of north-south compression and east-west extension.

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

Persistent Identifier

http://archives.pdx.edu/ds/psu/19681

geologicmap.pdf (24186 kB)
Geologic Map

cross sections.pdf (18103 kB)
Cross Sections

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