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Early high Cascade silicic volcanism : analysis of the McKenzie Canyon and Lower Bridge tuff

Creator:: Eungard, Daniel W.
Abstract:: 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...
Resource Type:: Masters Thesis

The stratigraphy, geochemistry, and mineralogy of two ash-flow tuffs in the Deschutes Formation, central Oregon

Creator:: Cannon, Debra May
Abstract:: 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...
Resource Type:: Masters Thesis

The Ore bin ; Vol. 36 No. 5 (May 1974)

Creator:: Oregon. Dept. of Geology and Mineral Industries and Lund, Ernest H.
Resource Type:: Journal
Full Text:: is the sandy marine terrace that fringes most of this segment of the Oregon coast. Where volcanic

The Ore bin ; Vol. 28 No. 9 (September 1966)

Creator:: Oregon. Dept. of Geology and Mineral Industries, Purdom, William B., and Lund, Ernest H.
Resource Type:: Journal
Full Text:: FORMATION HARNEY COUNTY, OREGON By Ernest H. Lund Department of Geology, University of Oregon The Pliocene

Surface-subsurface geology of the middle to upper Eocene sedimentary and volcanic rock units, western Columbia County, northwest Oregon

Creator:: Berkman, Thomas Anthony
Abstract:: The middle to upper Eocene Tillamook Volcanics form the basement in the Rock Creek - Rocky Point area. These tholeiitic to alkalic basalts, basaltic andesites, and andesites were erupted as shield volcanoes seaward of the strandline ontop of an older deep-marine mudstone unit (Yamhill Formation) and an accreted portion of...
Resource Type:: Masters Thesis

Stratigraphy of the neogene volcanic rocks along the lower Metolius River, Jefferson County, central Oregon

Creator:: Dill, Thomas E.
Resource Type:: Masters Thesis

The Ore bin ; Vol. 34 No. 6 (June 1972)

Creator:: Oregon. Dept. of Geology and Mineral Industries, Schmela, Ronald Jay, Palmer, Leonard A., Enlows, Harold E., and Parker, Donald James
Resource Type:: Journal
Full Text:: the Lower Clackamas River area, Clackamas County, Oregon: Portland State Univ., master's thesis, 113 p

The oligocene and miocene geology of the Tillamook embayment Tillamook County, northwest Oregon

Creator:: Parker, Michael J. (Michael John), 1958-
Abstract:: Eleven sedimentary and volcanic rock units are mapped and described in the thesis area, and chronicle the dynamic geologic history of the Tillamook embayment from the Oligocene through the middle Mlocene. The oldest unit is the Zemorrian to early Saucesian Smuggler Cove formation, a bathyal tuffaceous mudstone with some thin-...
Resource Type:: Masters Thesis

The Ore bin ; Vol. 27 No. 6 (June 1965)

Creator:: Oregon. Dept. of Geology and Mineral Industries, Snavely, Parke Detweiler, 1919-, Wagner, Holly Clyde, 1918-, and MacLeod, Norman S.
Resource Type:: Journal
Full Text:: three volcanic units (plate 1) in the central part of the Oregon Coast Range indicate that each unit has

The Ore bin ; Vol. 31 No. 3 (March 1969)

Creator:: Oregon. Dept. of Geology and Mineral Industries, Snavely, Parke Detweiler, 1919-, MacLeod, Norman S., Rau, Weldon W., and Geological Society of America. Cordilleran Section. Meeting (65th : 1969 : Eugene, Or.)
Abstract:: This field trip consists of two geologic tours. On Tour 1, the Tertiary sedimentary rocks exposed along the Yaquina River between Newport and Toledo, Oregon, will be examined. This tour will start at the mouth of Yaquina Bay where Miocene sedimentary rocks are exposed and will proceed generally eastward and...
Resource Type:: Journal
Full Text:: volcanic ash beds. Georgia-Pacific Corp. sawmill and paper plant are on right. 13.9 Junction of old

ScholarsArchive@OSU

Early high Cascade silicic volcanism : analysis of the McKenzie Canyon and Lower Bridge tuff

The stratigraphy, geochemistry, and mineralogy of two ash-flow tuffs in the Deschutes Formation, central Oregon

The Ore bin ; Vol. 36 No. 5 (May 1974)

The Ore bin ; Vol. 28 No. 9 (September 1966)

Surface-subsurface geology of the middle to upper Eocene sedimentary and volcanic rock units, western Columbia County, northwest Oregon

Stratigraphy of the neogene volcanic rocks along the lower Metolius River, Jefferson County, central Oregon

The Ore bin ; Vol. 34 No. 6 (June 1972)

The oligocene and miocene geology of the Tillamook embayment Tillamook County, northwest Oregon

The Ore bin ; Vol. 27 No. 6 (June 1965)

The Ore bin ; Vol. 31 No. 3 (March 1969)

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