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Here you will find publications, reports and articles produced by Energy and Mineral scientists. For a comprehensive listing of all USGS publications, click the button below.

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Extensional faulting in the southern Klamath Mountains, California Extensional faulting in the southern Klamath Mountains, California

Large northeast striking normal faults in the southern Klamath Mountains may indicate that substantial crustal extension occurred during Tertiary time. Some of these faults form grabens in the Jurassic and older bedrock of the province. The grabens contain continental Oligocene or Miocene deposits (Weaverville Formation), and in two of them the Oligocene or Miocene is underlain by Lower
Authors
R.A. Schweickert, W. P. Irwin

Correlation of Miocene flows of the Columbia River Basalt Group from the central Columbia River Plateau to the coast of Oregon and Washington Correlation of Miocene flows of the Columbia River Basalt Group from the central Columbia River Plateau to the coast of Oregon and Washington

Nearly twenty flows of the Columbia River Basalt Group (CRBG) can be paleomagnetically and chemically correlated westward as far as 500 km from the Columbia Plateau in Washington, through the Columbia Gorge, to the Coast Range of Oregon and Washington. In the Coast Range near Cathlamet, Washington, the CRBG flow stratigraphy includes 10 flows of Grande Ronde Basalt (1 low-MgO R2 flow, 6...
Authors
Ray E. Wells, R.W. Simpson, R. D. Bentley, Melvin H. Beeson, Margaret T. Mangan, Thomas L. Wright

Mechanisms of Cenozoic tectonic rotation, Pacific Northwest Convergent Margin, U.S.A. Mechanisms of Cenozoic tectonic rotation, Pacific Northwest Convergent Margin, U.S.A.

Large clockwise rotations (15–80°) are characteristic of Cenozoic volcanic and sedimentary rocks along the convergent margin of the northwestern United States. Abundant paleomagnetic data from 62–12 m.y. old rocks in forearc, arc, and backarc regions show that rotation increases with age and with proximity to the coast. Paleomagnetic and structural studies both support dextral shear as a
Authors
Ray E. Wells
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