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Geology of the Fishhawk Falls--Jewell area, Clatsop County, northwest Oregon

Creator:: Nelson, David Ezra
Abstract:: Plate 1 dimensions: 46 x 25 Plate 2 dimensions: 50 x 31 Plate 3 dimensions: 21 x 24.5 Plate 4 dimensions: 18 x 24.5
Resource Type:: Masters Thesis

The geology of the Nicolai Mountain-Gnat Creek area, Clatsop County, northwestern Oregon

Creator:: Murphy, Thomas M.
Abstract:: Twelve rock units, from upper Eocene to middle Miocene are exposed in the Nicolai Mountain-Gnat Creek area. They are, from oldest to youngest: Pittsburg Bluff Formation; Oswald West mudstone; Big Creek sandstone, upper Silver Point mudstone, and Pipeline mudstone members of the Astoria Formation; Depoe Bay Basalt; Grande Ronde Basalt;...
Resource Type:: Masters Thesis

The geology of the Elk Mountain-Porter Ridge area, Clatsop County, northwest Oregon

Creator:: Goalen, Jeffrey Scott
Abstract:: Eight Tertiary sedimentary and volcanic units crop out in the thesis area. From oldest to youngest they are the: Sager Creek formation (informal); Pittsburg Bluff Formation; Northrup Creek formation (informal); Smuggler Cove formation (informal); Wickiup Mountain and Cannon Beach members (both informal) of the Astoria Formation; the Grande Ronde Basalt,...
Resource Type:: Masters Thesis

Geology of the Rock Creek-Green Mountain area, southeast Clatsop and northernmost Tillamook counties, northwest Oregon

Creator:: Safley, L. Eugene
Abstract:: The middle to upper Eocene Tillamook Volcanics form the volcanic core or basement rocks in the Rock Creek-Green Mountain area. They consist of a thick sequence of high TiO2 tholeiitic basalt, basaltic andesite, and andesite subaerial flows and breccias. Detailed mapping, petrography, major oxide plots, magnetic polarity, and radiometric age...
Resource Type:: Masters Thesis

Geology of the Green Mountain-Young's River area, Clatsop County, northwest Oregon

Creator:: Peterson, Carolyn Pugh
Abstract:: The upper Eocene to lower Oligocene Oswald West mudstone is the oldest formation (informal) in the Green Mountain-Young's River area. This 1,663 meter thick hemipelagic sequence was deposited in a low-energy lower to upper slope environment in the Coast Range forearc basin. The formation ranges from the late Narizian to...
Resource Type:: Masters Thesis

Geology of the Elsie-lower Nehalem River area, south-central Clatsop and northern Tillamook counties, northwestern Oregon

Creator:: Mumford, Daniel Franklin
Abstract:: The middle Eocene Tillamook Volcanics form the oldest rock unit in the Elsie-lower Nehalem River area. K-Ar age determinations and age constraints imposed by foraminiferal and calcareous nannofossil assemblages of overlying sedimentary strata indicate an absolute age of about 42 Ma for the uppermost Tillamook Volcanics. Major oxide values indicate...
Resource Type:: Masters Thesis

Geology of the Hamlet-North Fork of the Nehalem River area, southern Clatsop and northernmost Tillamook Counties, northwest Oregon

Creator:: Rarey, Phillip Jay
Abstract:: The middle to late Eocene tholeiitic Tillamook Volcanics compose the oldest rock unit in the Hamlet-North Fork of the Nehalem River area. Geochemical plots and field relationships indicate that these rocks were produced in an extensional tectonic setting in the developing forearc and formed an extensive tholeiltic oceanic island. The...
Resource Type:: Masters Thesis

The petrography, structure, and stratigraphy of Powell Buttes, Crook County, central Oregon

Creator:: Weidenheim, Jan Peter
Resource Type:: Masters Thesis

The geology of the east central desolation butte quadrangle, Grant County, Oregon

Creator:: Elfrink, Neil
Abstract:: Pre-Tertiary metamorphic rocks, Jurassic granitic intrusions, and Eocene basalts are exposed along the North Fork of the John Day River at its confluence with Granite Creek. Geochemical and textural evidence suggest greenschist-metamorphosed, strongly sheared, volcanogenic rocks originated in an island-arc environment. These greenstones were apparently intruded during the Late Permian...
Resource Type:: Masters Thesis

Geology of pluvial Lake Chewaucan, Lake County, Oregon

Creator:: Allison, Ira Shimmin, 1895-
Abstract:: Pluvial Lake Chewaucan was a late Pleistocene lake, as much as 375 feet deep, covering 480 square miles in the northwestern part of the Great Basin in southern Oregon. The lake basin, now occupied by Summer Lake, Upper and Lower Chewaucan Marshes, and Lake Abert, was formed by down-dropped fault...
Resource Type:: Book
Full Text:: Coastal Oregon, by Ellen James Moore 11. Geology of Pluvial Lake Chewucan, Lake County, Oregon, by Ira S

ScholarsArchive@OSU

Geology of the Fishhawk Falls--Jewell area, Clatsop County, northwest Oregon

The geology of the Nicolai Mountain-Gnat Creek area, Clatsop County, northwestern Oregon

The geology of the Elk Mountain-Porter Ridge area, Clatsop County, northwest Oregon

Geology of the Rock Creek-Green Mountain area, southeast Clatsop and northernmost Tillamook counties, northwest Oregon

Geology of the Green Mountain-Young's River area, Clatsop County, northwest Oregon

Geology of the Elsie-lower Nehalem River area, south-central Clatsop and northern Tillamook counties, northwestern Oregon

Geology of the Hamlet-North Fork of the Nehalem River area, southern Clatsop and northernmost Tillamook Counties, northwest Oregon

The petrography, structure, and stratigraphy of Powell Buttes, Crook County, central Oregon

The geology of the east central desolation butte quadrangle, Grant County, Oregon

Geology of pluvial Lake Chewaucan, Lake County, Oregon

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