Portland State University. College of Liberal Arts and Sciences
Date of Award
Master of Science (M.S.) in Earth Science
1 online resource (79 p.)
Sediments (Geology) -- Analysis
The author has sampled the recent bottom sediments in Tillamook Bay, Oregon. Sediment distribution is assessed in relation to sediment source areas and related to sedimentary environments. Particular attention was directed to the precision with which granulometric data can be stated. It was found that variance is quite high for granulometric parameters of the bay sediments.
Sediment distribution using different measures are displayed on charts of the bay. Size distributions of sediments at any given location are examined for geologic significance. Plotting of size distribution on graph paper using probability ordinate is shown to increase the ease of geologic interpretation.
Total heavy minerals were X-rayed and provenance determinations from this and other data show a marine sediment source for a small area of the bay near the mouth and terrestrial source for the remainder of the bay.
Avolio, Gennaro William, "Granulometric analysis of recent sediments of Tillamook Bay, Oregon" (1973). Dissertations and Theses. Paper 1928.