Publications
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Assessing Metallic Resources in Alaska Assessing Metallic Resources in Alaska
In the last two decades federal and state governments have become in creasingly preoccupied with classi fying public lands according to the uses that may be made of them. One outcome of the classifying can be a change in the land's legal status from one in which any use is tolerated to one in which only selected activities are allowed. Since such a change af fects the economic and...
Authors
Donald A. Singer, A. Thomas Ovenshine
Revised geomagnetic polarity time scale for the interval 0–5 m.y. B.P. Revised geomagnetic polarity time scale for the interval 0–5 m.y. B.P.
A change in the constants used in K‐Ar dating and a significant increase in new data have made a recompilation and recomputation of data used to define the Late Cenozoic K‐Ar polarity time scale highly desirable at this time. All available data in the range 0–5 m.y. have been recalculated using the refined constants, with 354 data points in this time interval now meeting the minimum...
Authors
Edward A. Mankinen, G. Brent Dalrymple
Geomagnetic paleointensities by the Thelliers' method from submarine pillow basalts: Effects of seafloor weathering Geomagnetic paleointensities by the Thelliers' method from submarine pillow basalts: Effects of seafloor weathering
Measurements of geomagnetic paleointensity using the Thelliers' double‐heating method in vacuum have been made on 10 specimens of submarine pillow basalt obtained from 7 fragments dredged from localities 700,000 years old or younger. In the magnetic minerals, the titanium/iron ratio parameter x and the cation deficiency (oxidation) parameter x were determined by X‐ray diffraction and...
Authors
Sherman Gromme, Edward A. Mankinen, Monte Marshall, Robert S. Coe
Maps showing aeromagnetic anomalies, faults, earthquake epicenters, and igneous and volcanic rocks in the southern San Francisco Bay region, California Maps showing aeromagnetic anomalies, faults, earthquake epicenters, and igneous and volcanic rocks in the southern San Francisco Bay region, California
No abstract available.
Authors
William F. Hanna, Earl E. Brabb
Preliminary geologic map of the Castle Rock Ridge Quadrangle, Santa Cruz and Santa Clara counties, California Preliminary geologic map of the Castle Rock Ridge Quadrangle, Santa Cruz and Santa Clara counties, California
No abstract available.
Authors
Earl E. Brabb, T. W. Dibblee
Evidence for tectonic movement of the Las Positas Fault, Alameda County, California Evidence for tectonic movement of the Las Positas Fault, Alameda County, California
On October 29, 1979, a new exposure of the Las Positas fault zone near Livermore, California, was created by excavation of a creek bank along Arroyo Seco. The face of the bank was cleaned by geologists of Lawrence Livermore Laboratory (Livermore, California) to obtain a better and more complete view of the fault. The excavation was undertaken by Lawrence Livermore Laboratory as part of a...
Authors
Darrell G. Herd, Earl E. Brabb
Early Cretaceous metamorphic age of the South Fork Mountain Schist in the northern Coast Ranges of California Early Cretaceous metamorphic age of the South Fork Mountain Schist in the northern Coast Ranges of California
No abstract available.
Authors
Marvin A. Lanphere, M. Clark Blake, W. P. Irwin
Neogene basin formation in relation to plate tectonic evolution of San Andreas fault system, California Neogene basin formation in relation to plate tectonic evolution of San Andreas fault system, California
More than 90% of the known petroleum accumulations west of the San Andreas fault in California are in strata deposited in areally restricted Neogene basins that formed during a major tectonic reorganization of western California. These deep, localized Neogene basins replaced broad, regionally persistent Paleogene depositional aprons, although some of the Neogene basins in northern and...
Authors
Blake, R. H. Campbell, T. W. Dibblee, D. G. Howell, Tor H. Nilsen, W. R. Normark, J. G. Vedder, E. A. Silver
Apollo over the Moon: A view from orbit Apollo over the Moon: A view from orbit
No abstract available.
Authors
Harold Masursky, G. W. Colton, Farouk El-Baz, Frederick J. Doyle, Richard E. Eggleton, Maurice J. Grolier, James W. Head, Carroll Ann Hodges, Keith A. Howard, Leon J. Kosofsky, Baerbel K. Lucchitta, Michael C. McEwen, Henry J. Moore, Gerald G. Schaber, David H. Scott, Laurence A. Soderblom, Mareta West, D.E. Wilhems
Stratigraphic contrasts across the San Gregorio fault, Santa Cruz Mountains, west-central California Stratigraphic contrasts across the San Gregorio fault, Santa Cruz Mountains, west-central California
No abstract available.
Authors
J. C. Clark, E. E. Brabb