Physical Sciences and Mathematics Commons^™

Geology And Mineralization Of The Great Excelsior Mine, Whatcom County, Washington, Russell J. Franklin

WWU Graduate School Collection

The Great Excelsior Mine is located in the North Cascades of northwest Washington, approximately 6 miles (10 km) east of the town of Glacier. The deposit consists of Ag with subordinate Au and is hosted within felsic volcanic breccias, tuffaceous siltstones and graywackes, and felsic tuffs belonging to the Middle Jurassic Wells Creek Volcanics. The deposit is located approximately 1000 feet (305 m) below the contact between the Wells Creek Volcanics and the overlying Nooksack Group metasediments. Both units comprise the lowermost structural-metamorphic unit of the western North Cascades System.

The Wells Creek Volcanics have been informally subdivided into four …

Net Shore-Drift Along The Pacific Coast Of Clallam And Jefferson Counties, Washington, James Mahala

WWU Graduate School Collection

Geomorphic and sedimentologic indicators of shore drift were used to delineate the boundaries of drift unit cells and their direction of net shore-drift along the 110 km of Pacific coastline of Clallam and Jefferson Counties, Washington. These indicators include changes in bluff morphology, sediment size gradation, beach width and slope, direction of spit progradation and stream mouth diversion, deposition and/or erosion at drift obstructions, identifiable sediment, and nearshore bar orientation. Drift determinations were based on a field oriented approach emphasizing such long-term indicators, supplemented by aerial photography, and literature relevant to the coast.

Wind from the south-southwest prevail and predominate …

Paleomagnetic Evidence For Northward Transport Of The Methow-Pasayten Belt, Julian L. (Julian Linus) Granirer

WWU Graduate School Collection

High level demagnetization isolates a single syntectonic magnetization in ten stable sites from the upper Cretaceous Winthrop and Midnight Peak Formations in the Methow-Pasayten belt of north central Washington. The mean direction of D=11.4°, 1=62.6°, Alpha₉₅=4.7° is discordant with the expected in-situ direction. This discordance is interpreted as resulting from 1,370 km of northward transport between 93 and 45 Ma. Correcting the contemporaneous Mount Stuart direction from within the Cascade terrane for approximately 16° of southward tilt brings it into accord with the new Methow direction. Further, if northward translation of these terranes were initiated by a southward …

An Investigation Of Fluid Inclusions And Geochemistry Of Ore Formation In The Cedar Creek Breccia Pipe, North Santiam Mining District, Oregon, Mark B. Winters

WWU Graduate School Collection

The Cedar Creek breccia pipe is located in the North Santiam Mining District, Oregon, approximately 50 km. east of Salem. It was emplaced in the Sardine Formation, a series of andesitic flows, breccias, tuffs, and small intrusives of Middle to Late Miocene age.

The breccia pipe was discovered by Amoco Minerals Co. through soil sampling, a ground magnetic survey, and drilling. It is elliptical in plan view with maximum axes of approximately 110 and 145 m. and extends vertically downward over 350 m. The contacts between the pipe and the surrounding country rock are sharp and characterized by sheeted fault …

Sedimentary Petrology, Depositional Environment, And Tectonic Implications Of The Upper Eocene Quimper Sandstone And Marrowstone Shale, Northeastern Olympic Peninsula, Washington, William E. (William Ernst) Rauch

WWU Graduate School Collection

The Upper Eocene (Refugian) Quimper Sandstone and overlying Marrowstone Shale document approximately 300 meters of sediment deposited in a tectonically active, shallow marine area during a transgression. The Quimper Sandstone and Marrowstone Shale can be roughly divided into three facies, representing deposition from outer shore face and inner shelf to offshore or outer shelf.

Petrographic analysis of the Quimper Sandstone and Marrowstone Shale indicates geography and hydrodynamic conditions were responsible for a slight petrologic trend in composition such as more feldspar and lithic grains in the lower energy facies. The sandstones are lithic and feldspathic arenites and wackes with abundant …

Sedimentology, Sedimentary Petrology, And Tectonic Setting Of The Lower Miocene Clallam Formation, Northern Olympic Peninsula, Washington, Kurt Soe Anderson

WWU Graduate School Collection

The Lower Miocene Clallam Formation, located on the northern coast of the Olympic Peninsula, Washington, is an approximately 800 m thick sequence of sandstone and conglomerate that was deposited in the predominantly marine portion of a prograding delta.

As a whole, the Clallam Formation coarsens and shallows upward, progressing from fossiliferous sandstones deposited below wave base, through storm-dominated deposits characterized by climbing ripples, graded rythmites, and hummocky cross-stratification, to coarse-grained distributary mouth deposits. Within this general progression are several small-scale coarsening- and shallowing-upward cycles that reflect the occupation and subsequent abandonment of distributary channels.

Analysis of lithic and monocrystalline grain …

Glacial Geology Of The Tonasket – Spectacle Lake Area, Okanogan County, Washington, Keith A. (Keith Allen) Pine

WWU Graduate School Collection

Glacial sediments exposed in the northern Okanogan trough consist of Fraser advance stratified drift, lodgement till, and recessional stratified drift. No older Quaternary sediments were recognized in the mapped area.

The advance stratified drift unit is composed of upward-coarsening braided-stream outwash with locally intercalated lacustrine and alluvial fan sediments. An upsection change in facies within the unit suggests a gradation from distal to proximal deposition of proglacial outwash with time in Spectacle Lake Coulee. The gradation probably records the approach of Cordilleran ice into the area during the Fraser advance.

Upland regions of the study area are mantled by a …