First Advisor

Robert O. Van Atta

Date of Publication

1989

Document Type

Thesis

Degree Name

Master of Science (M.S.) in Geology

Department

Geology

Language

English

Subjects

Cowlitz Formation (Or. and Wash.), Stratigraphic geology -- Eocene, Geology -- Oregon -- Columbia County, Geology -- Oregon -- Washington County

DOI

10.15760/etd.5789

Physical Description

1 online resource (183p.)

Abstract

The Upper Eocene Cowlitz Formation is exposed in surface outcrops southwest of the town of Vernonia, in Columbia County, Oregon. The Cowlitz Formation also occurs in the subsurface of the Mist gas field where its Clark and Wilson (C and W) sandstone member (informal) acts as a natural gas reservoir, and its upper Cowlitz mudstone member (informal) acts as a cap rock. Surface exposures and continuous core were studied in order to determine Cowlitz Formation stratigraphy, and its depositional environment. Fresh core samples were also studied petrographically, and with a scanning electron microscope, in order to determine the effects of diagenesis in the gas producing C and W sandstone member.

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Comments

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This thesis includes supplemental content.

Persistent Identifier

http://archives.pdx.edu/ds/psu/21800

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