Physical Sciences and Mathematics Commons^™

The Geology And Petrology Of The Fifes Peak Formation In The Cliffdell Area, Central Cascades, Washington, Brad A. (Bradley Allen) Carkin

WWU Graduate School Collection

The Fifes Peak Formation in the Cliffdell area is comprised of two structurally, lithologically and geochemically distinct members separated by a pronounced unconformity. The older member (Edgar Rock member) is comprised of highly brecciated lava flows, coarse laharic breccia and lesser volcaniclastic sediments and tuffs. A thickness of at least 1,800 m is exposed near Edgar Rock. K-Ar ages indicate a latest Oligocene age of about 24 to 27 Ma. Lava compositions range from basalt to dacite, but are mostly basaltic andesite. These lavas are typically highly porphyritic and contain an anhydrous phenocryst assemblage of plagioclase, olivine, minor clinopyroxene and …

Monthly Planet, 1987, December, Erin Wright, Huxley College Of The Environment, Western Washington University

The Planet

No abstract provided.

Monthly Planet, 1987, Novemeber, Erin Wright, Huxley College Of The Environment, Western Washington University

The Planet

No abstract provided.

Monthly Planet, 1987, June, Amy Morrison, Huxley College Of The Environment, Western Washington University

The Planet

No abstract provided.

Monthly Planet, 1987, May, Amy Morrison, Huxley College Of The Environment, Western Washington University

The Planet

No abstract provided.

Monthly Planet, 1987, March, Amy Morrison, Huxley College Of The Environment, Western Washington University

The Planet

No abstract provided.

Monthly Planet, 1987, February, Amy Morrison, Huxley College Of The Environment, Western Washington University

The Planet

No abstract provided.

Biostratigraphic Zonation Of Late Paleozoic Depositional Sequences, Charles A. Ross, June R. P. Ross

Geology Faculty Publications

Correlation of more than seventy third-order depositional sequences in Carboniferous and Permian strata uses assemblage zones of warm water benthic and nektonic shelf faunas. These include calcareous foraminifers, bryozoans, conodonts, and ammonoids and represent tropical, subtropical, and warm temperate water faunas from carbonate shelves and adjacent cratonic basins.

After the Early Carboniferous faunal zonation was highly provincial and worldwide correlations of depositional sequences are based on interpretations of evolutionary lineages and depositional patterns in each province and in identifying times of limited dispersals between provinces.

Associated with these faunal zones there were times of expanded or reduced faunal diversities and …

Late Paleozoic Sea Levels And Depositional Sequences, Charles A. Ross, June R. P. Ross

Geology Faculty Publications

Cyclic sea level charts for the Lower Carboniferous (Mississippian), Middle and Upper Carboniferous (Pennsylvanian), and Permian show considerable variability in the duration and magnitude of third-order depositional sequences, and also in the position of general sea level as represented by second-order sea level. Transgressive and highstand system tracts are numerous on the cratonic shelves of the late Paleozoic continents. Shelf margin wedges are less well represented except at times of general lower sea levels. Most low stand wedges and all low stand fan systems are structurally deformed and make up many of the accretionary wedges and displaced terranes that lie …

Quantification Of Net Shore-Drift Rates In Puget Sound And The Strait Of Juan De Fuca, Washington, R. Scott Wallace

WWU Graduate School Collection

Quantitative analysis of net shore-drift has been carried out at twenty-six sites in Puget Sound and the Strait of Juan de Fuca, Washington, U.S.A. Three methods were used to obtain net shore-drift rates: (1) field measurement of sediment accumulation at drift obstructions; (2) extrapolation of spit growth using aerial photographs and historical maps; and (3) evaluation of maintenance-dredging volumes at navigation channels.

The study area was divided into four regions based on physiography, and the effect of wind patterns on the area. The largest volumes of sediment were transported in the west-central region, along the southern coast of the Strait …

Depositional Environment, Provenance, And Tectonic Setting Of The Upper Oligocene Sooke Formation, Vancouver Island, B. C., Susan Elaine Bream

WWU Graduate School Collection

The Upper Oligocene Sooke Formation, the uppermost unit of the Carmanah Group, is exposed along the southeastern coast of Vancouver Island, British Columbia, where it is part of the Crescent terrane. The Sooke Formation is generally less than 45 meters thick.

Typically, a basal boulder breccia is overlain by interdigitated layers of cross-stratified, often fossiliferous sandstone and conglomerate. Deposition of the Sooke Formation occurred along a steep coast with abundant cliffs, narrow boulder beaches and sandy beaches, and a nearby fluvial source. The conglomerates and breccias were deposited by debris flows, rock falls, and as storm lag deposits. Sandstones were …

Petrology And Tectonic Evolution Of The Bowers Supergroup Northern Victoria Land, Antarctica, Ray (Ray Joseph) Robert Jr.

WWU Graduate School Collection

The Bowers Supergroup of northern Victoria Land, Antarctica is at least 6.5 km thick and consists of Solidarity, Molar, and Glasgow Formations of the Middle Cambrian Sledgers Group; Middle to late Cambrian Mariner Group; and Middle Ordovician Leap Year Group. The Solidarity Formation is at least 0.4 km thick and consists of submarine tholeiites. The Molar Formation is up to 2.7 km thick and consists of slope-facies turbidites in its southwesternmost extent and shelf-facies sediments in its northeasternmost extent. Sediment provenance was the Glasgow Formation and a continental landmass lying northeast of the southwestern sloping Bowers basin. The Glasgow Formation …

Paleomagnetism Of The Late Cretaceous Ventura Member Of The Midnight Peak Formation, Methow-Pasayten Belt, North-Central Washington, David R. (David Richard) Bazard

WWU Graduate School Collection

Paleomagnetic analysis was conducted on 31 sites of the Ventura redbed Member of the Midnight Peak Formation located in the Methow-Pasayten belt, north-central Washington. Single high-stability components of magnetization, chiefly retained by high-unblocking temperature hematite exist in specimens from all but two of the sites. Directions calculated from these components were found to form circular within-site distributions and to be consistent across several meters of section. The single high-stability components, positive inclinations, and pre-folding, thus pre-Paleocene magnetizations suggest that the Ventura Member records a single Late Cretaceous dipole-field.

Proportionally untilting site-mean directions did not produce a reasonable field direction nor …

A Gravity Survey And Analysis Of The Mount Stuart Block Of Washington State, Gregg M. Petrie

WWU Graduate School Collection

Gravity data were gathered in the vicinity of the Mt. Stuart Block, a horst of pre-Tertiary rocks which include the Chiwaukum Schist, the composite Mt. Stuart Batholith, and the Ingalls Complex with its related metasedimentary-volcanic sequence, located in the east central Cascade Mountains of Washington. The final complete Bouguer map suggests the following features: (1) displacement of the Chiwaukum Graben occurs mostly on the west side in a narrow, 4-5 km, block 5.5 to 7.5 km deep, expanding in width to the north; (2) the Ingalls Complex is a relatively shallow feature: certainly a model hypothesizing a deep plug of …

The Petrography And Tectonic Significance Of The Blue Mountain Unit, Olympic Peninsula, Washington, Jon M. Einarsen

WWU Graduate School Collection

The sedimentary rocks of the early to middle Eocene Blue Mountain unit compose the stratigraphic base of the otherwise predominantly basaltic Crescent Formation in the Olympic Peninsula, Washington. In the study area, primarily in northeastern portions of the Olympic Peninsula, the Blue Mountain unit consists of two distinct petrofacies, one a plagioclase-rich feldspathic arenite, the other a chert-rich lithic arenite. A third petrofacies is a feldspathic-lithic arenite and is a petrologic combination of the two distinct petrofacies. The source areas for the plagioclase-rich and chert-rich petrofacies are interpreted to be the Coast Plutonic Complex and San Juan Islands, respectively. The …

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 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 …

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 …

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 …

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 …

Monthly Planet, 1985, December, Robert Galford, Huxley College Of The Environment, Western Washington University

The Planet

No abstract provided.

On The Regularity Of The Critical Point Infinity Of Definitizable Operators, Branko Ćurgus

Mathematics Faculty Publications

In this note necessary and sufficient conditions for the regularity of the critical point infinity of a definitizable operator A are given. Using these criteria it is proved that the regularity of the critical point infinity is preserved under some additive perturbations as well as for some operators which are related to A. Applications to indefinite Sturm-Liouville problems are indicated.