Publications
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Geomagnetic polarity epochs: Nunivak Island, Alaska Geomagnetic polarity epochs: Nunivak Island, Alaska
New paleomagnetic and potassium-argon dating measurements have been made of basalt flows from Nunivak Island, Alaska, with the following results. (1) The best estimate of the age of the Brunhes/Matuyama polarity epoch boundary is found to be 0.694 m.y. (2) The best estimate of the age of the Gauss/Gilbert boundary is 3.32 m.y. (3) Three normally magnetized flows with ages from 0.93 to 0...
Authors
A. Cox, G. Dalrymple
Geomagnetic polarity epochs: A new polarity event and the age of the Brunhes-Matuyama boundary Geomagnetic polarity epochs: A new polarity event and the age of the Brunhes-Matuyama boundary
Recent paleomagnetic-radiometric data from six rhyolite domes in the Valles Caldera, New Mexico, indicate that the last change in polarity of the earth's magnetic field from reversed to normal (the Brunhes-Matuyama boundary) occurred at about 0.7 million years ago. A previously undiscovered geomagnetic polarity event, herein named the "Jaramillo normal event," occurred about 0.9 million...
Authors
Richard R. Doell, G. Dalrymple
Landslides in the vicinity of the Fort Randall Reservoir, South Dakota Landslides in the vicinity of the Fort Randall Reservoir, South Dakota
This report covers the first 4 years (1952 through 1956) of a project to investigate landslides in the vicinity of the Fort Randall Reservoir in South Dakota and to determine the effects of the new reservoir on landslide activity.
Authors
Christopher Erskine
Preliminary report on the geologic and geophysical investigations of the Loveland Basin landslide, Clear Creek County, Colorado Preliminary report on the geologic and geophysical investigations of the Loveland Basin landslide, Clear Creek County, Colorado
Geologic and geophysical investigations of the Loveland Basin landslide, which formed at the cut for the east portal of the Straight Creek tunnel, were made by the U.S. Geological Survey in cooperation with the U.S. Bureau of Public Road and the Colorado Department of Highways. The investigations indicate that the slide has a probable minimum volume of 500,000 cubic yards weighing 1,000...
Authors
Charles Sherwood Robinson, R. Carroll, Fitzhugh Lee
Geomagnetic polarity epochs Geomagnetic polarity epochs
[No abstract available]
Authors
A. Cox, Richard R. Doell, G. Dalrymple
Geomagnetic polarity epochs: Sierra Nevada II Geomagnetic polarity epochs: Sierra Nevada II
Ten new determinations on volcanic extrusions in the Sierra Nevada with potassium-argon ages of 3.1 million years or less indicate that the remanent magnetizations fall into two groups, a normal group in which the remanent magnetization is directed downward and to the north, and a reversed group magnetized up and to the south. Thermomagnetic experiments and mineralogic studies fail to...
Authors
A. Cox, Richard R. Doell, G. Dalrymple
Preliminary report on landslides in a part of the Orinda Formation, Contra Costa County, California Preliminary report on landslides in a part of the Orinda Formation, Contra Costa County, California
No abstract available.
Authors
Dorothy Radbruch, Louise Weiler
Geomagnetic polarity epochs and pleistocene geochronometry Geomagnetic polarity epochs and pleistocene geochronometry
[No abstract available]
Authors
A. Cox, Richard R. Doell, G. Dalrymple
Landslides along the Columbia River valley, northeastern Washington, with a section on seismic surveys Landslides along the Columbia River valley, northeastern Washington, with a section on seismic surveys
No abstract available.
Authors
Fred Jones, Daniel Embody, Warren Peterson, R. M. Hazlewood
Landslides in the San Francisco South quadrangle, California Landslides in the San Francisco South quadrangle, California
No abstract available.
Authors
Manuel Bonilla
Landslide conditions along the Ferry County highway parallelling Lake Roosevelt from Kettle Falls to the mouth of the Spokane River, Washington Landslide conditions along the Ferry County highway parallelling Lake Roosevelt from Kettle Falls to the mouth of the Spokane River, Washington
As part of the program of the U.S. Geological Survey, landslides are being studied in several localities in the United States. These studies are directed toward assembling criteria for recognition of landslides, classification, and cataloging of remedial or control methods that have been effective. In the gorge of the Columbia Ricer in Washington, landslides of large magnitude have been...
Authors
Fred Jones