Portland State University. Department of Geology
Date of Award
Master of Science (M.S.) in Geology
1 online resource (120 p.)
Stratigraphic geology -- Eocene, Stratigraphic geology -- Miocene, Fossil foraminifera -- Oregon -- Nehalem River Watershed, Geology -- Oregon -- Nehalem River Watershed
Examination of stream and roadcut exposures of the Cowlitz Formation allows the selection of measured representative sections, and collection of fossils, from an area roughly defined by the intersection of the boundaries of Clatsop, Columbia, Tillamook and Washington counties in Oregon. The study defines the features of the local environment of deposition, correlates sections to derive a composite columnar section, and develops a checklist of species for both microfossils and megafossils of the Cowlitz Formation.
Shaw, Neil B., "Biostratigraphy of the Cowlitz Formation in the upper Nehalem River Basin, northwest Oregon" (1986). Dissertations and Theses. Paper 3654.