Portland State University. Department of Geology
Paul E. Hammond
Date of Award
Master of Science (M.S.) in Geology
1 online resource (137 p.)
Volcanic ash -- Washington (State) -- Chumstick Formation, Stratigraphic geology -- Eocene
This study outlines the ash (tuff) bed stratigraphy (tephrostratigraphy) in the middle Eocene Chumstick Formation of central Washington. The tuff beds provide local marker beds enabling interpretation of the stratigraphy and structure of the formation. The chemical signature of these units provides the basis on which the units can be traced over broad areas in the basin of deposition. Correlations of tuff beds were obtained over distances of 41 km.
McClincy, Matthew John, "Tephrostratigraphy of the middle Eocene Chumstick Formation, Cascade Range, Douglas County, Washington" (1986). Dissertations and Theses. Paper 3633.