Castle Rocks is 12 miles east of Mt. Jefferson, in the central
Cascades of Oregon. The area contains volcanic rocks ranging from
mid-Miocene to Holocene in age. These rocks record alternating
periods of tholeiitic and calc-alkaline volcanism.
The oldest rocks in the area range from basaltic andesite lava
flows to...
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north end of Green Ridge, Jefferson County, Oregon
AN ABSTRACT OF THE THESIS OF
David W. Wendland
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School 1938-1965 by David But
Dedicated to 0.0. Adams.
who found an idea in the Puget Sound
backwoods
During the 1980s the sales and use of all-terrain vehicles (ATVs) was on the rise. Many people used them for recreation, while others started using them on their ranch or farm for work-related purposes. As a result, morbidity and mortality rates also began to climb. It became apparent that the...
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o Roller
o Tiller
o Mower
o Aerator
o Sweeper
o Bagger
o Spot sprayer
o Rear blade
o Three
Silicic volcanism in the central Oregon Cascade range has decreased in both the size and frequency of eruptions from its initiation at ~40 Ma to present. The reasons for this reduction in silicic volcanism are poorly constrained. Studies of the petrogenesis of these magmas have the potential for addressing this...
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Cascade Silicic Volcanism: Analysis of the McKenzie Canyon and
Lower Bridge Tuff
Abstract
The City of Newport (City) plans to develop a tsunami evacuation site to serve the
South Beach area. The proposed site consists of an undeveloped hill located
adjacent to Highway 101, southwest of the Yaquina Bay Bridge (Figure 1A,
Appendix A). The site will be designated Safe Haven Hill. This...
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sand and imported granular fill will require the use of a
smooth drum, vibratory roller. Smaller
Two ash-flow tuff units of the late Miocene-early Pliocene Deschute Formation in central Oregon were studied in detail because of the widespread distribution, diverse compositions, and stratigraphic importance.
The Lower Bridge tuff is a double-flow simple
cooling unit that is poorly welded. The upper flow grades from rhyolite in the...
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McKenzie Canyon tuff is a multiple flow compound
cooling unit that overlies the Lower Bridge tuff. It may
Channel evolution and influences of changing floodplain
characteristics, heterogenous bank materials, and altered flow regimes were
examined along the Willamette River, a large alluvial river in northwestern
Oregon. The Willamette River is composed of a series of geomorphically
diverse reaches, which have each evolved uniquely in the century following
Euro-American...
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according to physiographic characteristics. The historically
anastomosing and relatively steep McKenzie
We report ³He/⁴He for 150 mid-ocean ridge basalt (MORB) glasses from the Southeast Indian
Ridge (SEIR). Between 81°E and 101°E ³He/⁴He varies from 7.5 to 10.2 R[subscript A], encompassing more than half the
MORB range away from ocean island hot spots. Abrupt transitions are present and in one case the...
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Helium isotopic textures in Earth’s upper mantle
David W. Graham1, Barry B. Hanan2, Christophe H�emond3