Publications
Publications from the staff of the Geology, Minerals, Energy, and Geophysics Science Center
Filter Total Items: 2487
Paleomagnetic data from the Coso Range, California and current status of the Cobb Mountain normal geomagnetic polarity event Paleomagnetic data from the Coso Range, California and current status of the Cobb Mountain normal geomagnetic polarity event
Two basalt flows which erupted about 1.08 m.y. ago in the Coso Range, California, have normal magnetic polarity and thus provide additional evidence for the Cobb Mountain normal polarity event. A review of available data confirms that this event was of geomagnetic origin. A mean age of 1.10 ± 0.02 m.y. B.P. for the Cobb Mountain normal polarity event was found to best fit all available...
Authors
Edward A. Mankinen, C. Sherman Gromme
By
Geologic map of the southern part of the Mount Hayes quadrangle, Alaska Geologic map of the southern part of the Mount Hayes quadrangle, Alaska
No abstract available.
Authors
Warren J. Nokleberg, N. R. Albert, G. C. Bond, P. L. Herzon, R. T. Miyaoka, W. H. Nelson, D.H. Richter, T. E. Smith, J. H. Stout, Warren Yeend, R. E. Zehner
Distribution, mineralogy, and texture of manganese nodules and their relation to sedimentation at DOMES Site A in the equatorial North Pacific Distribution, mineralogy, and texture of manganese nodules and their relation to sedimentation at DOMES Site A in the equatorial North Pacific
DOMES Site A, in the equatorial North Pacific, was surveyed in detail in an attempt to relate the distribution of nodules to sedimentation. The sea floor is characterized by a broad east-west-trending valley defined by strongly dissected highlands to the north and south. Sediment recovered from the highlands and from the north margin of the valley is late Quaternary. The associated...
Authors
David Z. Piper, J. R. Blueford
Evaluation of potential surface faulting and other tectonic deformation Evaluation of potential surface faulting and other tectonic deformation
No abstract available.
Authors
M. G. Bonilla
Post 12 m.y. rotation of southwest Washington Post 12 m.y. rotation of southwest Washington
Paleomagnetic field directions from the basalt of Pack Sack Lookout are compared to those from the Pomona Member of the Saddle Mountains Basalt of the Columbia River Basalt Group. The Pomona crops out over a wide region on the Columbia Plateau east of the Cascade Range, and the basalt of Pack Sack Lookout crops out well to the west of the Cascades about 30 to 60 km east of the Washington...
Authors
James R. Magill, Ray E. Wells, Robert W. Simpson, Allan Cox
Preliminary geologic map of Tecoma and Lucin quadrangles, Box Elder County, Utah, and Elko County, Nevada Preliminary geologic map of Tecoma and Lucin quadrangles, Box Elder County, Utah, and Elko County, Nevada
No abstract available.
Authors
David M. Miller, Joel D. Schneyer
Tectonic accretion of the Klamath Mountains Tectonic accretion of the Klamath Mountains
No abstract available.
Authors
W. P. Irwin
A geologic reconnaissance of the Cycladic blueschist belt, Greece A geologic reconnaissance of the Cycladic blueschist belt, Greece
The Cycladic blueschist belt consists of two distinctive segments separated by a broad zone of superposed granitic and high-temperature metamorphic rocks. The northern segment contains early metamorphic fold axes and parallel glaucophane lineations that trend ∼060° with a progressive increase in metamorphism toward the southeast. The southern segment contains similar fold axes and...
Authors
M. Clark Blake, Michel Bonneau, Jacques Geyssant, J.R. Kienast, Claude Lepvrier, Henri Maluski, Dimitrios Papanikolaou
Mid-Cretaceous radiolarians in Perapedhi Formation Mid-Cretaceous radiolarians in Perapedhi Formation
No abstract available.
Authors
W. P. Irwin, B.L. Murchey, D. L. Jones, S.A. Kling
Geology of a subduction complex in the Franciscan assemblage of northern California Geology of a subduction complex in the Franciscan assemblage of northern California
No abstract available.
Authors
M. Clark Blake, A. S. Jayko, D. G. Howell
Seismic zonation in the San Francisco Bay region Seismic zonation in the San Francisco Bay region
No abstract available.
Authors
E. E. Brabb
In the southwest: Tectonic evolution reviewed In the southwest: Tectonic evolution reviewed
No abstract available.
Authors
D. M. Miller, Keith A. Howard, M. D. Carr