Net-mortality of Common Murres and Atlantic Puffins in Newfoundland, 1951-81
John F. Piatt, David N. Nettleship, William Threlfall
David N. Nettleship, Gerald A. Sanger, Paul F. Springer, editor(s)
1982, Conference Paper, Marine birds: Their feeding ecology and commercial fisheries relationships
Band recoveries (N = 315) over 26 years (1951-77) and three surveys of seabird bycatch in inshore fishing nets (1972, 1980-81) indicate that there has been a substantial net-mortality of Atlantic Puffins (Fratercula arctica) and Common Murres (Uria aalge) in Newfoundland coastal waters for the past 2 decades. Offshore (e.g....
The emplacement of ophiolites by collision
Zvi Ben-Avraham
1982, Journal of Geophysical Research (87) 3861-3867
Ophiolites, recognized in most of the world's orogenic belts, are generally interpreted to be oceanic crust and upper mantle (lithosphere) fragments that have been incorporated into continental margins at consuming plate boundaries. We suggest that the mechanism for ophiolite emplacement is the same in both the Alpine and Andean-type orogenes....
Strata-bound sulfide deposits, wall-rock alteration, and associated tin-bearing minerals in the Carolina slate belt, South Carolina and Georgia
Henry Bell
1982, Economic Geology (77) 294-311
Massive sulfide deposits, gold deposits, and tin-bearing minerals occur in rocks of the Carolina slate belt in South Carolina and adjacent Georgia. The belt of greenschist metamorphic rocks in which the ore deposits occur is mostly Cambrian in age. It is divided into an upper metasedimentary unit and a lower...
Sensitivity of selected geomagnetic properties to truncation level of spherical harmonic expansions
E.R. Benton, Ronald H. Estes, R.A. Langel, L.A. Muth
1982, Geophysical Research Letters (9) 254-257
A two day selection of MAGSAT data is fit by spherical harmonic series truncated at increasing levels NF in the range 2<NF<14 to determine the extent to which the geomagnetic Gauss coefficients depend upon truncation level of the fit. The dependence is found to be concentrated in the range n<NF≲n+4...
Volume of organic-rich Devonian shale in the Appalachian Basin: relating "black" to organic-matter content: Geologic notes
Ronald R. Charpentier, James W. Schmoker
1982, American Association of Petroleum Geologists Bulletin (66) 375-378
Some estimates of natural-gas resources in the Devonian shale of the Appalachian basin depend on the volume of organic-rich shale in the basin. A map by L. G. Wallace and W. de Witt showing the thickness and extent of Devonian "black" shale facies in the Appalachian basin is widely used...
Analysis of barium and strontium in sediments by dc plasma emission spectrometry
P. C. Bowker, F.T. Manheim
1982, Applied Spectroscopy (3) 378-382
The dc plasma arc is suited to analysis of barium and strontium in a wide range of sedimentary rock matrices, from sands, shales, and carbonates, to ferromanganese nodules. Samples containing 10 ppm to more than 3000 ppm barium and strontium were studied. Both alkali (3500 ppm lithium borate, from a...
Time-predictable bimodal volcanism in the Coso Range, California
Charles R. Bacon
1982, Geology (10) 65-69
The bimodal Pleistocene part of the Coso volcanic field has erupted rhyolite and basalt at constant long-term rates during the past ∼0.5 m.y. Both basalt and high-silica rhyolite were erupted in several independent, geologically brief episodes. The interval between eruptions of rhyolite was proportional to the volume of the preceding...
Source parameters of the 1980 Mammoth Lakes, California, earthquake sequence
Ralph J. Archuleta, Edward Cranswick, Charles Mueller, Paul Spudich
1982, Journal of Geophysical Research B: Solid Earth (87) 4595-4607
From the more than 1500 Mammoth Lakes earthquakes recorded on three-component digital seismographs (Spudich et al., 1981), 150 were used in an analysis of the locations, mechanism, and source parameters. A composite fault plane solution of nine earthquakes 3.9 ≤ M ≤ 5.1 defines a right-lateral strike slip mechanism on...
The use of vertical seismic profiles in seismic investigations of the earth
Alfred H. Balch, Myung W. Lee, J. J. Miller, Robert T. Ryder
1982, Geophysics (47) 906-918
During the past 8 years, the U.S. Geological Survey has conducted an extensive investigation on the use of vertical seismic profiles (VSP) in a variety of seismic exploration applications. Seismic sources used were surface air guns, vibrators, explosives, marine air guns, and downhole air guns. Source offsets have ranged from...
Diatom biostratigraphy and paleoecology of the type section of the Luisian Stage, central California
Jack G. Baldauf, John A. Barron
1982, Micropaleontology (28) 84
Diatoms from the type section of the Luisian Stage in central California correlate with the lowermost part of the Denticulopsis lauta Zone through the lower part of subzone "a" of the Denticulopsis hustedtii-D. lauta Zone and are early Middle Miocene in age (about 6.0 to 14.0 Ma), Rocks assigned to...
Detached crystalline rocks of the Mohave, Buck, and Bill Williams Mountains, western Arizona
Keith A. Howard, J. W. Goodge, B.E. John
1982, Book chapter, Mesozoic-Cenozoic tectonic evolution of the Colorado River Region, California, Arizona, and Nevada
No abstract available....
Regional character of mylonitic gneiss in the Cadiz Valley area, southeastern California
Keith A. Howard, D. M. Miller, B.E. John
E.G. Frost, D.L. Martin, editor(s)
1982, Book chapter, Mesozoic-Cenozoic tectonic evolution of the Colorado River Region, California, Arizona, and Nevada
No abstract available....
Geologic and geochronologic reconnaissance of the Turtle Mountains area, California: West border of the Whipple Mountains detachment terrane
Keith A. Howard, Paul Stone, M.A. Pernokas, R. F. Marvin
E.G. Frost, D.L. Martin, editor(s)
1982, Book chapter, Mesozoic-Cenozoic tectonic evolution of the Colorado River Region, California, Arizona, and Nevada
No abstract available....
Miocene actinommid Radiolaria from the equatorial Pacific
J. R. Blueford
1982, Micropaleontology (28) 189-213
Actinommids (spumellarian Radiolaria) are a group of microfossils in which taxonomy and phylogeny hitherto have been based on features of morphology that change with the growth of individuals. To make Miocene actinommids from the equatorial Pacific useful in biostratigraphy, paleocenography, and paleoecology, ontogenetically invariant morphological features can be analyzed by...
Geologic factors that control mineral matter in coal
C. B. Cecil, R.W. Stanton, F.T. Dulong, J.J. Renton
R.H. Filby, Brett Carpenter, Richard C. Ragaini, editor(s)
1982, Book chapter, Atomic and Nuclear Methods in Fossil Energy Research
Elements other than organically derived and bound C, H, N, O, and S constitute mineral matter in coal. Mineral matter may consist of discrete minerals such as calcite, quartz, clays, and pyrite, and/or organic compounds that contain organically bonded elements such as Ca and CI. Processes that may affect the...
The Georges Bank monitoring program: analysis of trace metals in bottom sediments
Michael H. Bothner
1982, Report
No abstract available....
Iridium abundance measurements across the Cretaceous/Tertiary boundary in the San Juan and Raton Basins of northern New Mexico
C. J. Orth, J. S. Gilmore, J.D. Knight, R.H. Tschudy, C. L. Pillmore, James E. Fassett
1982, GSA Special Papers (190) 423-433
During the past year we have been measuring trace element abundances and searching for anomalously high iridium (Ir) concentrations in continental sedimentary rocks that span the Cretaceous-Tertiary boundary in the Raton and San Juan Basins of northern New Mexico and southern Colorado. Using neutron activation and radiochemical separations, we have...
Observations of strain accumulation across the San Andreas fault near Palmdale, California, with a two-color geodimeter
J. O. Langbein, Mark F. Linker, Art McGarr, L.E. Slater
1982, Science (218) 1217-1219
Two-color laser ranging measurements during a 15-month period over a geodetic network spanning the San Andreas fault near Palmdale, California, indicate that the crust expands and contracts aseismically in episodes as short as 2 weeks. Shear strain parallel to the fault has accumulated monotonically since November 1980,...
Triggering of large earthquakes by magma-chamber inflation, Izu Peninsula (Japan)
Wayne R. Thatcher, James C. Savage
1982, Geology (10) 637-640
A close spatial and temporal association between three aseismic uplift episodes and subsequent large (M ≈ 7) earthquakes on the Izu Peninsula, Japan, suggests a causal relation. Quaternary geology, as well as studies by other workers, indicates a volcanic origin for the observed uplift, and we use a simple inflation...
Shuttle imaging radar experiment
C. Elachi, W.E. Brown, J.B. Cimino, T. Dixon, D.L. Evans, J.P. Ford, R.S. Saunders, C. Breed, H. Masursky, J.F. McCauley, G. Schaber, L. Dellwig, A. England, H. MacDonald, P. Martin-Kaye, F. Sabins
1982, Science (218) 996-1003
The shuttle imaging radar (SIR-A) acquired images of a variety of the earth's geologic areas covering about 10 million square kilometers. Structural and geomorphic features such as faults, folds, outcrops, and dunes are clearly visible in both tropical and arid regions. The combination of SIR-A and Seasat...
Subsurface valleys and geoarcheology of the eastern Sahara revealed by shuttle radar
J.F. McCauley, G. G. Schaber, C. S. Breed, M. J. Grolier, C.V. Haynes, B. Issawi, C. Elachi, R. Blom
1982, Science (218) 1004-1020
The shuttle imaging radar (SIR-A) carried on the space shuttle Columbia in November 1981 penetrated the extremely dry Selima Sand Sheet, dunes, and drift sand of the eastern Sahara, revealing previously unknown buried valleys, geologic structures, and possible Stone Age occupation sites. Radar responses from bedrock and...
Uranium in spring water and bryophytes at basin creek in central idaho
H.T. Shacklette, J. A. Erdman
1982, Journal of Geochemical Exploration (17) 221-236
Arkosic sandstones and conglomerates of Tertiary age beneath the Challis Volcanics of Eocene age at Basin Creek, 10 km northeast of Stanley, Idaho, contain uranium-bearing vitrainized carbon fragments. The economic potential of these sandstones and conglomerates is currently being assessed. Springs abound at the contacts of rock units, and water...
Mineral identification from orbit: Initial results from the shuttle multispectral infrared radiometer
Alexander F.H. Goetz, L. C. Rowan, M.J. Kingston
1982, Science (218) 1020-1024
A shuttle-borne radiometer containing ten channels in the reflective infrared has demonstrated that direct identification of carbonates and hydroxyl-bearing minerals is possible by remote measurement from Earth orbit. ...
Auditory evoked potentials in the West Indian Manatee (Sirenia: Trichechus manatus)
Theodore H. Bullock, Thomas J. O'Shea, Michael C. McClune
1982, Journal of Comparative Physiology A (148) 547-554
Potentials evoked by clicks and tone pips were recorded by fine wires inserted extracranially in four West Indian manatees (Trichechus manatus) in air. Sounds were delivered via padded ear phones. Averaging a few thousand trials at 20/s reveals early peaks at N5.4 (‘vertex’ negativity to a frontal reference, at 5.4 ms),...
U-Pb ages of uranium ores in the Churchrock uranium district, New Mexico
K.R. Ludwig, Bruce Rubin, Neil Fishman, Richard L. Reynolds
1982, Economic Geology (77) 1942-1945
No abstract available....
