Publications
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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
Paleomagnetic evidence for a Late Cretaceous deformation of the Great Valley Sequence, Sacramento Valley, California Paleomagnetic evidence for a Late Cretaceous deformation of the Great Valley Sequence, Sacramento Valley, California
Paleomagnetic samples from five localities within the Great Valley sequence range in age from Late Jurassic to Late Cretaceous. All samples possess normal polarity, and alternating-field demagnetization experiments show that the remanence was acquired after the sequence was folded. A mean paleomagnetic pole position determined from 17 demagnetized samples is located at 72° N., 181° E...
Authors
Edward A. Mankinen
Feasibility and cost of using a computer to prepare landslide susceptibility maps of the San Francisco Bay region, California Feasibility and cost of using a computer to prepare landslide susceptibility maps of the San Francisco Bay region, California
No abstract available.
Authors
Evelyn B. Newman, Arthur R. Paradis, Earl E. Brabb
Geological Survey research 1978 Geological Survey research 1978
This U.S. Geological Survey activities report includes a summary of 1978 fiscal year scientific and economic results accompanied by a list of geologic and hydrologic investigations in progress and a report on the status of topographic mapping. The summary of results includes: (1) Mineral and water resources, (2) Engineering geology and hydrology, (3) Regional geology, (4) Principles and...
Authors
Water Resources Division U.S. Geological Survey
Preliminary geologic maps of the Chittenden, Los Gatos, and Watsonville East quadrangles, California Preliminary geologic maps of the Chittenden, Los Gatos, and Watsonville East quadrangles, California
No abstract available.
Authors
T. W. Dibblee, Earl E. Brabb
Preliminary geologic map of the Laurel Quadrangle, Santa Cruz and Santa Clara counties, California Preliminary geologic map of the Laurel Quadrangle, Santa Cruz and Santa Clara counties, California
No abstract available.
Authors
T. W. Dibblee, E. E. Brabb, Joseph C. Clark
Regional mineral resource assessment in Alaska, a case history Regional mineral resource assessment in Alaska, a case history
No abstract available.
Authors
Donald A. Singer, W. D. Menzie, John H. DeYoung
Age measurements of potassium-bearing sulfide minerals by the 40Ar/39Ar technique Age measurements of potassium-bearing sulfide minerals by the 40Ar/39Ar technique
K-Ar ages have been determined for sulfide minerals for the first time. The occurrence of adequate amounts of potassium-bearing sulfides with ideal compositions K3Fe10S14 (∼10 wt.% K) and KFe2S3 (∼16 wt.% K) in samples from a mafic alkalic diatreme at Coyote Peak, California, prompted an attempt to date these materials. K3Fe10S14, a massive mineral with conchoidal fracture, gives an age...
Authors
G.K. Czamanske, M. A. Lanphere, Richard C. Erd, M.C. Blake
Map showing saturated thickness of unconsolidated aquifer, southwestern Kansas, January 1975 Map showing saturated thickness of unconsolidated aquifer, southwestern Kansas, January 1975
No abstract available.
Authors
Edwin D. Gutentag, D.H. Lobmeyer, Steven E. Slagle
Distribution and character of upper Mesozoic subduction complexes along the west coast of North America Distribution and character of upper Mesozoic subduction complexes along the west coast of North America
Structurally complex sequences of sedimentary, volcanic, and intrusive igneous rocks characterize a nearly continuous narrow band along the Pacific coast of North America from Baja California, Mexico to southern Alaska. They occur in two modes: (1) as complexly folded but coherent sequences of graywacke and argillite that locally exhibit blueschist-grade metamorphism, and (2) as melanges
Authors
D. L. Jones, M.C. Blake, E. H. Bailey, R. J. McLaughlin
Geomagnetic polarity event recorded at 1.1 m.y. B.P. on Cobb Mountain, Clear Lake volcanic field, California Geomagnetic polarity event recorded at 1.1 m.y. B.P. on Cobb Mountain, Clear Lake volcanic field, California
Paleomagnetic studies show that a normal polarity event within the Matuyama reversed polarity epoch is recorded by one of the volcanic units on Cobb Mountain in northern California. K-Ar age determinations show that this event has an age of 1.12 ± 0.02 m.y. and clearly preceded the Jaramillo normal polarity event. These data provide the first confirmation from a subaerial volcano that a...
Authors
Edward A. Mankinen, J.M. Donnelly, C. S. Grommé
Geomagnetic paleointensities from radiocarbon‐dated lava flows on Hawaii and the question of the Pacific nondipole low Geomagnetic paleointensities from radiocarbon‐dated lava flows on Hawaii and the question of the Pacific nondipole low
Radiocarbon ages have been published for nine basaltic lava flows on the island of Hawaii; the ages range from 2600 to somewhat older than 17,900 years B.P. By using the Thelliers' method in vacuum, geomagnetic paleointensity values were obtained from eight of the lavas; the ninth proved unsuitable. The paleointensities for the four youngest flows (2600–4600 years B.P.) yield virtual...
Authors
Robert S. Coe, Sherman Gromme, Edward A. Mankinen