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Date of Award
Master of Science (MS)
Brown, Edwin H.
Pevear, David R.
Suczek, Christopher A., 1942-2014
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 fan, and (2) the middle unit represents channel deposits of a middle fan.
The dominant pyroclastic texture of the volcanic rocks, the apparent magmatic arc provenance of the volcaniclastic sandstones and comparison of the Nooksack Group with other ancient and modern deposits suggests that the Nooksack Group represents a marginal or fore arc basin related to an arc terrane
Stratigraphy, Nooksack Group
Western Washington University
Subject – LCSH
Geology--Washington (State)--Cascade Range; Petrology--Washington (State)--Cascade Range; Geology, Stratigraphic
Cascade Range; Washington (State)
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Sondergaard, Jon Niels, "Stratigraphy and Petrology of the Nooksack Group in the Glacier Creek-Skyline Divide Area, North Cascades, Washington" (1979). WWU Graduate School Collection. 849.