Physical Sciences and Mathematics Commons^™

Quaternary Geology And Stratigraphy Of Kitsap County, Washington, Jerald D. Deeter

WWU Graduate School Collection

New radiocarbon dates and stratigraphic evidence indicate correlations between stratigraphic units on Whidbey Island and in Kitsap County. Eight new C¹⁴ dates and five previous dates, together with the stratigraphic position of units and similarities in their composition, support the concept that the Double Bluff Drift, Whidbey Formation, and possibly Possession Drift, extend south of Whidbey Island into Kitsap County.

In Kitsap County, fine-grained floodplain deposits of the Whidbey Formation, with radiocarbon dates beyond the limits of conventional laboratory methods, are located at higher elevations than adjacent floodplain deposits of the Olympia nonglacial interval. This stratigraphic relationship suggest that …

A Paleocurrent Analysis Of A Portion Of The Chuckanut Depositional Basin Near Bellingham, Washington, James Norman Hartwell

WWU Graduate School Collection

The Chuckanut Formation is an upper Cretaceous to lower Tertiary sequence of conglomerate, sandstone, siltstone, and some coal deposited by streams near Bellingham, in western Whatcom County, Washington. Paleocurrent analysis of an area in the northwestern portion of the Chuckanut Formation shows two stream directions: to the south or southeast for the lower and middle sections and to the west or northwest for the upper section of the unit. Distinct differences in the lithology of clasts in the conglomerates support this conclusion. Angular phyllitic and quartz clasts in the lower and middle sections probably were derived locally from the Barrington …

Stratigraphy And Petrology Of The Nooksack Group In The Glacier Creek-Skyline Divide Area, North Cascades, Washington, Jon Niels Sondergaard

WWU Graduate School Collection

The 6-7 kilometer thick Upper Jurassic-Lower Cretaceous Nooksack Group is divided informally into four units on the basis of lithology. The basal unit consists of tuffaceous sandstone and keratophyric tuff with minor intercalations of argillite and intermediate crystalline volcanic rocks. The lower unit is composed of interbedded black argillite and volcaniclastic sandstone. The middle unit consists of thick-bedded volcaniclastic sandstone and coarse, sedimentary breccia with minor argillite. The upper unit is comprised of interbedded black argillite and volcaniclastic sandstone.

Lithologies and sedimentary structures within these units suggest: (1) the lower and upper units represent depositional lobe deposits of a middle …

Coastal Zone Processes And Geomorphology Of Skagit County, Washington, Ralph Francis Keuler

WWU Graduate School Collection

Geomorphic mapping of 130 km of marine shoreline in Skagit County reveals repeated morphologic and sedimentologic trends along many segments of the coast. The shoreline segments within which the trends are repeated are the littoral drift cells or shore drift sectors that act as nearly closed systems with respect to longshore sediment transport. The longshore trends include changes in mean grain size of beaches, sediment sorting, foreshore morphology, back- shore width and morphology, bluff morphology, and mean beach slope. The last parameter, slope, can be used as an index or surrogate measure of simultaneous changes in the other longshore trends. …