Publications
Filter Total Items: 1144
Circum-Pacific Conference included the environment
No abstract available.
Authors
E. E. Brabb, T. L. Wright
Stratigraphic contrasts across the San Gregorio fault, Santa Cruz Mountains, west-central California
No abstract available.
Authors
J. C. Clark, E. E. Brabb
Examples of seismic zonation in the San Francisco Bay region
No abstract available.
Authors
W. J. Kockelman, E. E. Brabb
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
No abstract available.
Authors
T.W. Dibblee, E. E. Brabb, Joseph C. Clark
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 containin
Authors
D. L. Jones, M. C. Blake, E. H. Bailey, R. J. McLaughlin
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 of 29.4 ±
Authors
G.K. Czamanske, M. A. Lanphere, Richard C. Erd, M. C. Blake
Regional mineral resource assessment in Alaska, a case history
No abstract available.
Authors
Donald A. Singer, W. D. Menzie, John H. DeYoung
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., with the ra
Authors
Edward A. Mankinen
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 dipole moment
Authors
Robert S. Coe, Sherman Gromme, Edward A. Mankinen
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 brief pola
Authors
Edward A. Mankinen, J.M. Donnelly, C. S. Grommé
Map showing saturated thickness of unconsolidated aquifer, southwestern Kansas, January 1975
No abstract available.
Authors
Edwin D. Gutentag, D.H. Lobmeyer, Steven E. Slagle