Publications
Filter Total Items: 2670
Tectonic significance of Late Paleozoic to Jurassic radiolarians from the North Fork terrane, Klamath Mountains, California
No abstract available.
Authors
Charles D. Blome, William P. Irwin
Review of "Orogeny," Miyashiro, A., Aki, K., and Sengor, A. M. C., eds., Wiley
No abstract available.
Authors
William P. Irwin
The ophiolitic North Fork terrane in the Salmon River region, central Klamath Mountains, California
The North Fork terrane is an assemblage of ophiolitic and other oceanic volcanic and sedimentary rocks that has been internally imbricated and folded. The ophiolitic rocks form a north-trending belt through the central part of the region and consist of a disrupted sequence of homogeneous gabbro, diabase, massive to pillowed basalt, and interleaved tectonitic harzburgite. U-Pb zircon age data on a
Authors
C.J. Ando, W. P. Irwin, D. L. Jones, J.B. Saleeby
Conodonts of the western Paleozoic and Triassic belt, Klamath Mountains, California and Oregon
Conodonts were extracted from 32 samples of limestone and 5 samples of chert obtained from the Western Paleozoic and Triassic belt of the Klamath Mountains province. Triassic conodonts were found in 17 samples, and late Paleozoic conodonts in 7 samples. Conodonts of the remaining 13 samples cannot be dated more closely than early or middle Paleozoic through Triassic. The late Paleozoic conodonts a
Authors
William P. Irwin, Bruce R. Wardlaw, T.A. Kaplan
New data on the age of Lepidocyclina in California
During the 1930's and early 1940's, controversy about the age of Lepidocyclina californica and faunas associated with it led to unreconcilable differences of opinion in the attempt to provide a standard stratigraphic framework for Cenozoic rocks of western North America. Two standards with significantly different series age assignments were provided, one based largelyon benthic foraminifers and th
Authors
E. E. Brabb, Kristen McDougall, R. Z. Poore
Comment and reply on ‘Transgressive-regressive cycles and the occurrence of coal in some Upper Cretaceous strata of Utah’: Comment
No abstract available.
Authors
James E. Fassett
Distribution and origin of sulfur in Colorado oil shale
The sulfur content of 1,225 samples of Green River oil shale from two core holes in the Piceance Creek Basin, Colorado, ranges from nearly 0 to 4.9 weight percent. In one core hole, the average sulfur content of a sequence of oil shale 555 m thick, which represents nearly the maximum thickness of oil shale in the basin, is 0.76 weight percent. The vertical distribution of sulfur through the oil sh
Authors
John R. Dyni
Studies related to the Charleston, South Carolina, earthquake of 1886 — Tectonics and seismicity
Since 1973, the U.S. Geological Survey (USGS), with support from the Nuclear Regulatory Commission, has conducted extensive investigations of the tectonic and seismic history of the Charleston, S.C., earthquake zone and surrounding areas. The goal of these investigations has been to discover the cause of the large intraplate Charleston earthquake of 1886, which dominates the record of seismicity i
Authors
David Gottfried, C. S. Annell, G. R. Byerly, Marvin A. Lanphere, Jeffrey D. Phillips, Gregory S. Gohn, Brenda B. Houser, Ray R. Schneider, Hans D. Ackermann, B. R. Yantis, John K. Costain, F. Steve Schilt, Larry Brown, Jack E. Oliver, Sidney Kaufman, Robert Morrison Hamilton, John C. Behrendt, V. James Henry, Kenneth C. Bayer, David L. Daniels, Isidore Zietz, Peter Popenoe, T. M. Chowns, C. T. Williams, Robert E. Dooley, J. Wampler, William P. Dillon, Kim D. Klitgord, Charles K. Paull, Lyle D. McGinnis, James W. Dewey, Arthur C. Tarr, Susan Rhea, Carl M. Wentworth, Marcia Mergner-Keefer, G. A. Bollinger
The Frontier Formation and mid- Cretaceous orogeny in the foreland of southwestern Wyoming
Tectonism in SW Wyoming and adjoining areas, and fluctuations of sea level in the central USA during the mid-Cretaceous are represented by the regional stratigraphy of the Frontier Formation. The Frontier consists mainly of clastic rocks that were deposited in marine and nonmarine environments during latest Albian, Cenomanian, Turonian, and Coniacian time. -from Author
Authors
E. Allen Merewether
Studies in Tertiary stratigraphy of the California Coast Ranges
The correlation of rocks of Paleogene age in California with those in Europe has had a long and complex history that can only be highlighted here. Kleinpell (1938, p. 168-181), in his classic work defining Miocene benthic1 foraminiferal stages of California, attempted to correlate faunas of California with those of western Europe and elsewhere. He pointed out that rocks usually considered lower Mi
Summary of workshops concerning regional seismic source zones of parts of the conterminous United States, convened by the U.S. Geological Survey, 1979-1980, Golden, Colorado
Workshops were convened by the U.S. Geological Survey to obtain the latest information and concepts relative to defining seismic source zones for five regions of the United States. The zones, with some modifications, have been used in preparation of new national probabilistic ground motion hazard maps by the U.S. Geological Survey. The five regions addressed are the Great Basin, the Northern Rocky
Authors
P. C. Thenhaus, F. A. McKeown, R.C. Bucknam, D. C. Ross, R.E. Anderson, W. P. Irwin, D. P. Russ, W. H. Diment
Geologic and geochronologic reconnaissance of the Turtle Mountains area, California: West border of the Whipple Mountains detachment terrane
No abstract available.
Authors
Keith A. Howard, Paul Stone, M.A. Pernokas, R. F. Marvin