Sponsor
Portland State University. Department of Earth Science
First Advisor
Paul E. Hammond
Date of Publication
6-10-1973
Document Type
Thesis
Degree Name
Master of Science (M.S.) in Geology
Department
Earth Science
Language
English
Subjects
Geological surveys -- Washington (State) -- Kittitas County, Petrology -- Washington (State) -- Kittitas County, Geology, Petrology
DOI
10.15760/etd.2184
Physical Description
1 online resource. Digitized manuscript.
Abstract
The southwestern part of the Kachess Lake quadrangle lies between Lakes Cle Elum and Kachess, on the east flank of the central Cascade Range of Washington. The region lies between the North and South Cascade petrologic provinces, and includes rocks typical of each. Pre-Tertiary Easton Schist (called the Shuksan Suite farther north), and the Late Cretaceous-Paleocene Swauk Formation occur widely in the North Cascades, while the Tertiary Silver Pass Volcanics and Teanaway Basalt are typical of South Cascade volcanic sequences. Diabasic dikes of the Teanaway dike swarm occur throughout the vicinity.
The area is bounded on the west by a major fault, the Kachess, and bot.h folding and faulting have occurred in the area proper. Folding is represented by southeast plunging Thorp Mountain anticline; to the north, and Domerie Creek syncline to the south. Several faults have been recognized, the most important being northwest-southeast trending Thomas Mountain fault, which diagonally bisects t.he folds and complicates stratigraphic relationships.
The region has been geologically active during most of its history. Eugeosynclinal rocks were metamorphosed to blueschists and greenschists during a late Paleozoic-early Mesozoic orogeny, and folding, faulting, and unconformable relationships involving Tertiary strata indicate continued diastrophism during the Cenozoic.
Rights
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Persistent Identifier
http://archives.pdx.edu/ds/psu/14560
Recommended Citation
Lofgren, David Carl, "The Bedrock Geology of the Southwest Part of the Kachess Lake Quadrangle, Washington" (1973). Dissertations and Theses. Paper 2187.
https://doi.org/10.15760/etd.2184
Bedrock geologic map and geologic cross-sections of the southwest part of the Kachess Lake quadrangle