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Date Permissions Signed


Date of Award

Spring 1979

Document Type

Masters Thesis

Degree Name

Master of Science (MS)



First Advisor

Brown, Edwin H.

Second Advisor

Pevear, David R.

Third Advisor

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

OCLC Number


Subject – LCSH

Geology--Washington (State)--Cascade Range; Petrology--Washington (State)--Cascade Range; Geology, Stratigraphic

Geographic Coverage

Cascade Range; Washington (State)




masters theses




Copying of this document in whole or in part is allowable only for scholarly purposes. It is understood, however, that any copying or publication of this thesis for commercial purposes, or for financial gain, shall not be allowed without the author's written permission.

1979sondergaardjonmap1reduced.pdf (3959 kB)
The Geology of the Nooksack Group-North Cascades, Washington

1979sondergaardjonmap2reduced.pdf (449 kB)
Plate 2 - Stratigraphy and Age Chart

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