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Date Permissions Signed
Date of Award
Master of Science (MS)
Brown, Edwin H.
Babcock, R. Scott (Randall Scott)
Suczek, Christopher A., 1942-2014
Detailed mapping of the Goat Mountain dunite and the western and southern margins of the Twin Sisters dunite indicates that the structural setting of these bodies is dominated by high-angle northwest-trending fault zones. The Goat Mountain dunite overlies rocks of the Chilliwack Group and Yellow Aster Complex as a lowangle, west-dipping slab approximately 2500 feet thick. Cretaceous phyllite west of Goat Mountain overlies Chilliwack Group rocks along a similar low-angle west-dipping fault contact. These structures are both truncated by high-angle fault zones.
The timing of faulting is poorly constrained. High-angle faulting is at least post-Eocene through Holocene (?), and may have begun as early as Late Cretaceous. Thrust emplacement of the Cretaceous phyllite over rocks of the Chilliwack Group may or may not have been contemporaneous with dunite emplacement.
Western Washington University
Twin Sisters Range (Wash.)
Copying of this thesis 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.
Frasse, Frederic I., "Geology and Structure of the Western and Southern Margins of Twin Sisters Mountain, North Cascades, Washington" (1981). WWU Graduate School Collection. 639.