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Date Permissions Signed
5-25-2018
Date of Award
Spring 1979
Document Type
Masters Thesis
Degree Name
Master of Science (MS)
Department
Geology
First Advisor
Brown, Edwin H.
Second Advisor
Pevear, David R.
Third Advisor
Suczek, Christopher A., 1942-2014
Abstract
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
Type
Text
Keywords
Stratigraphy, Nooksack Group
Publisher
Western Washington University
OCLC Number
1088439468
Subject – LCSH
Geology--Washington (State)--Cascade Range; Petrology--Washington (State)--Cascade Range; Geology, Stratigraphic
Geographic Coverage
Cascade Range; Washington (State)
Format
application/pdf
Genre/Form
masters theses
Language
English
Rights
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.
Recommended Citation
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.
https://cedar.wwu.edu/wwuet/849
The Geology of the Nooksack Group-North Cascades, Washington
1979sondergaardjonmap2reduced.pdf (449 kB)
Plate 2 - Stratigraphy and Age Chart