Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 1 of 1
Full-Text Articles in Earth Sciences
Geology Of The Park Butte-Loomis Mountain Area, Washington (Eastern Margin Of The Twin Sisters Dunite), David L. (David Lewis) Blackwell
Geology Of The Park Butte-Loomis Mountain Area, Washington (Eastern Margin Of The Twin Sisters Dunite), David L. (David Lewis) Blackwell
WWU Graduate School Collection
Mappable units in the Park Butte-Loomis Mountain area of northwestern Washington are distinguished on the basis of age, lithologic association, structural position, and metamorphic recrystallization. There are four volcanic/volcaniclastic units: the Chilliwack Group, the Cultus Formation, the Elbow Lake-Haystack Mountain unit, and the Nooksack Group: and at least three allocthonous crystalline units: ultramafic rock (including the Twin Sisters and Goat Mountain dunite bodies), the Yellow Aster Complex, and the Vedder Complex. All units occur as tectonic fragments (fault bounded blocks) which are juxtaposed along anastomosing, horizontal to low angle, west dipping faults.
The upper Paleozoic Chilliwack Group is represented by …