The Roza flow of the Columbia River Basalt group in Washington State U.S.A. extruded at about 15 Ma during intermediate geomagnetic polarity. The Roza is underlain by normal polarity flows and overlain by reversed units. The Roza is an extensive flow, up to 60 in thick. As the remanence-blocking isotherms progressed into the flow, it recorded a short continuous segment of the transitional geomagnetic field. Our studies show limited thermal remagnetization in the underlying flow, and we infer that groundwater was effective in extracting the heat. The extent of basement heating was further reduced by the insulating scoria immediately beneath Roza. Hence, the Roza flow cooled symmetrically from its top and base. Samples from the drilicores acquired drilling induced remanent magnetization (DIRM), shown to be well modelled as an isothermal remanent magnetization produced in nonuniform fields of the order of 10 mT at the rim of the drillstring. Alternating field demagnetization was usually successful in removing the DIRM. The remanence stability is higher in the top third of Roza, due to smaller magnetic particles, than in the lower two thirds of the flow, where the magnetic properties are nearly uniform. The stability profile corresponds to the entablature/colonnade subdivision. High temperature subsolidus oxidation of the titanomagnetites increased with height in the flow, altering the primary symmetric intraflow distribution. The declination of the Roza flow sampled at numerous outcrops is consistently about 189°. In a 54 m drillcore section, Roza inclinations become more negative towards the flow interior, consistent with its magnetostratigraphic position. Superimposed is a symmetric, rapid change in inclination from -2 to -15° and back to -5°. The flow's thermal history predicts that these fluctuations have a characteristic time between 15 and 60 years, such that the inclination changed at a rate of 1/2 to 2° per year, showing that the directions of this transitional field fluctuated several times more rapidly than the present geomagnetic field. However, considering the generally reduced intensity during transitions, these fluctuations might not be unusual. / Graduation date: 1990

On the Columbia Plateau, the origin of the Winter Village Pattern has long been a focus of research. Intensification of resources such as salmon, roots, and local aquatic resources is often cited as the cause of declining mobility. To address this question in the middle Snake River region, I have re-analyzed fish remains from the Hetrick site (10WN469; Weiser, ID), with occupations spanning the Holocene. Expectations from foraging theory and paleoclimate data are used to address whether salmon and other fish use changed over time and if such changes are correlated with the development of the Winter Village Pattern. The results of my research indicate that there is no correlation between the timing of increased salmonid use at the Hetrick site and paleoclimatic change or the earliest evidence for the Winter Village Pattern. Further, these results are very similar to patterns of fish use seen at other sites on the Snake River, particularly those from the Early and Middle Holocene.

Graduation date: 1998

155 p. / Lone Pine Indian Shaker Village, located in The Dalles, Oregon, is the last remaining example of a late nineteenth century fishing settlement, a resource type that once proliferated along the banks of the Columbia River. Lone Pine Indian Shaker Village is also significant for its association with mixed heritage settlement, Native American fishing traditions, and the Indian Shaker Religion, a religion unique to the Northwest. This is an historical and architectural study of the village which includes the historical context and detailed description of the built environment, as it exists today and has evolved over time. Photographs, measured drawings, oral interviews and archival research are used to document and analyze the history and built environment of the village. Also included is a discussion of Treatment and Use options, followed by the author's recommendation for preservation and use of the village complex as an interpretive site. Today the village complex is vacant and suffers from neglect, and on November 19, 1996 the Indian Shaker Church collapsed under snow loads. Although an unfortunate event, it brings the issue of preservation of the entire site to the forefront. If no management plan is developed this valuable piece of Northwest cultural history will be lost forever. / Keepers of the Preservation Education Fund's H. Ward Jandl Fellowship

Graduation date: 1992

Thesis (M.A.)--Washington State University, 2005. / Title from PDF t.p. (viewed on Nov. 6, 2005). Includes bibliographical references (p. 75-84).