Physical Sciences and Mathematics Commons^™

Monthly Planet, 1986, December, Amy Morrison, Huxley College Of The Environment, Western Washington University

The Planet

No abstract provided.

Monthly Planet, 1986, November, Amy Morrison, Huxley College Of The Environment, Western Washington University

The Planet

No abstract provided.

Cretaceous Paleomagnetism Of The Methow-Pasayten Belt, Washington, Russ R. Burmester, Myrl E. Beck Jr., Julian L. Granierer

Geology Faculty Publications

Detailed demagnetization experiments isolated a characteristic remanent magnetization in ten stable sites from the upper Cretaceous Winthrop and Midnight Peak Formation in the Methow-Pasayten belt of north-central Washington. This remanence agrees best between opposite limbs of a fold (the Goat Peak syncline) when corrected for 46% of tilt. This is consistent with magnetization acquired during deformation. Synfolding magnetization may have been facilitated by a thermo-chemical event associated with synkinematic intrusions along the axis of folding. The mean direction (D=12.0°, I=61.1°, Alpha-95=4.8°) is highly discordant with respect to the expected direction for north-central Washington. This discordance points to about 1,400 km …

Paleomagnetism Of Middle Tertiary Volcanic-Rocks From The Western Cascade Series, Northern California, Myrl E. Beck Jr., Russ R. Burmester, Douglas E. Craig, C. Sherman Gromme, Ray E. Wells

Geology Faculty Publications

The Western Cascade Series (WCS) is a 3.5-km-thick, crudely homoclinal (east dipping) calcalkaline volcanic sequence of mid-Oligocene to early Miocene age that crops out near the southern tip of the Cascade Range in northern California. The mean direction of remanent magnetization in the WCS is D, 4.9°; I, 57.6° (N, 53; k, 14.4; α₉₅ , 5.3°). When compared to a reference direction for the North American cration, the WCS direction indicates that the southern Cascade Range has rotated 14.0° +/- 9.0° since the WCS accumulated. A difference in mean direction between the lower and upper halves of the WCS …

Monthly Planet, 1986, June, Miriam Ellard, Huxley College Of The Environment, Western Washington University

The Planet

No abstract provided.

Monthly Planet, 1986, May, Miriam Ellard, Huxley College Of The Environment, Western Washington University

The Planet

No abstract provided.

Monthly Planet, 1986, April, Miriam Ellard, Huxley College Of The Environment, Western Washington University

The Planet

No abstract provided.

Monthly Planet, 1986, February, Miriam Ellard, Huxley College Of The Environment, Western Washington University

The Planet

No abstract provided.

Structure And Petrology Of The Grandy Ridge-Lake Shannon Area, North Cascades, Washington, Moira T. (Moira Tracey) Smith

WWU Graduate School Collection

The Grandy Ridge-Lake Shannon area contains four major lithologic units: the Chilliwack Group, the Yellow Aster Complex, and the informally named "chert/basalt" and "Triassic dacite" units. The units are juxtaposed along anastomosing low angle faults of Late Cretaceous age. Additional deformation took place at a more recent time.

Lithologies of the Chilliwack Group predominate in the study area, with fine-grained sedimentary rocks of the lower clastic sequence present at lower elevations in the map area, and relatively mafic volcanic rocks present mostly at higher elevations. Sedimentary rocks in the vicinity of Upper Baker Dam, originally mapped as part of the …

Structure And Petrology Along A Segment Of The Shuksan Thrust Fault, Mount Shuksan Area, Washington, Peter A. Leiggi

WWU Graduate School Collection

The structural geology of the Mt. Shuksan area is dominated by the Shuksan thrust fault. This fault juxtaposes the mid to late Paleozoic Chilliwack Group with the structurally overlying, early Cretaceous Shuksan Metamorphic Suite. The Shuksan thrust fault is a complex imbricate zone, approximately 1.5 km wide in map view, in which rocks of the Shuksan Suite and Chilliwack Group are imbricated with lesser amounts of exotic tectonic slices. Mesoscopic structures are chaotic and mostly disordered although a dominant shear fabric is pervasive. The macroscopic structure of the fault zone is relatively simple: it forms a shallowly-dipping plane with a …

Structure And Petrology Of The Deer Peaks Area Western North Cascades, Washington, Gregory Joseph Reller

WWU Graduate School Collection

Dominant bedrock units of the Deer Peaks area, northwestern Washington, include the Shuksan Metamorphic Suite, the Deer Peaks unit, the Chuckanut Formation, the Oso volcanic rocks and the Granite Lake Stock. Rocks of the Shuksan Metamorphic Suite (SMS) exhibit a stratigraphy of meta-basalt, iron/manganese schist, and carbonaceous phyllite. The shear sense of stretching lineations in the SMS indicates that during high pressure metamorphism the subduction zone dipped to the northeast relative to the present position of the rocks. Exposures of the SMS along Coal Mountain are consistent with interpretation of folding as an isoclinal anticline though discrimination between an F …

Net Shore-Drift Along The Strait Of Juan De Fuca Coast Of Clallam County, Washington, Steven C. (Steven Craig) Bubnick

WWU Graduate School Collection

Net shore-drift along the north coast of Clallam County, Washington, was determined by using geomorphic and sedimentologic indicators. These indicators include changes in bluff morphology, delta plan form, beach width and slope, sediment size gradation, direction of stream mouth diversion, spit growth, deposition and erosion at drift obstructions, identifiable sediment, relict beach ridges, and imbricated beach sediment.

Irregularities in the coastline have caused the shore drift to become divided into drift cells, each displaying zones of supply, transportation, and accumulation. Drift direction determinations were made through field observations of the indicators, supplemented by the study of photographs, topographic maps, and …

Genesis Of Gold Mineralization In The Lone Jack Mine Area, Mt. Baker Mining District, Washington, Lief G. Christenson

WWU Graduate School Collection

The Lone Jack group of claims is in the Mt. Baker Mining District, northern Whatcom County, Washington. Three prominent gold-quartz veins are present, two of which were mined and produced 945 kg of gold between 1901 and 1924. Since then mining operations have not been renewed.

The quartz veins are within 3 km of surface exposures of the Miocene Chilliwack Batholith, above and within a zone of deformation related to the mid-Late Cretaceous Shuksan fault. This major Northern Cascades structure has juxtaposed the Upper Mesozoic Carrington Phyl lite over the Paleozoic volcanic and sedimentary rocks of the Chilliwack Group. The …