Speculations on processes responsible for mesoscale current lineations on the continental shelf, southern California
Herman A. Karl
1980, Marine Geology (34) M9-M18
A side-scan sonar survey of San Pedro shelf, California, reveals areas of mesoscale current lineations oriented approximately north-northeast in water depths of 20-25 m. Widths of sand ribbons range from 40 to 120 m and intervening erosional furrows, from 15 to 50 m. A conceptual model shows that the scale...
Implications of regional gravity for state of stress in the earth's crust and upper mantle
M. McNutt
1980, Journal of Geophysical Research Solid Earth (85) 6377-6396
Topography is maintained by stress differences within the earth. Depending on the distribution of the stress we classify the support as either local or regional compensation. In general, the stresses implied in a regional compensation scheme are an order of magnitude larger than those corresponding to local isostasy. Gravity anomalies,...
Nd-isotopes in selected mantle-derived rocks and minerals and their implications for mantle evolution
A. R. Basu, M. Tatsumoto
1980, Contributions to Mineralogy and Petrology (75) 43-54
The Sm-Nd systematics in a variety of mantle-derived samples including kimberlites, alnoite, carbonatite, pyroxene and amphibole inclusions in alkali basalts and xenolithic eclogites, granulites and a pyroxene megacryst in kimberlites are reported. The additional data on kimberlites strengthen our earlier conclusion that kimberlites are derived from a relatively undifferentiated chondritic...
Littoral transport in the surf zone elucidated by an Eulerian sediment tracer
D.B. Duane, W.R. James
1980, Journal of Sedimentary Petrology (50) 929-942
An Eulerian, or time integration, sand tracer experiment was designed and carried out in the surf zone near Pt. Mugu, California on April 19, 1972. Data indicate that conditions of stationarity and finite boundaries required for proper application of Eulerian tracer theory exist...
Human disturbance at water sources of desert bighorn sheep
David M. Leslie Jr., C. L. Douglas
1980, Technical Report CPSU/UNLV 010/12
No abstract available at this time...
Studies of bighorn-burro interaction in Death Valley: progress toward the objectives
C. L. Douglas
1980, Technical Report CPSU/UNLV 006/19
No abstract available at this time...
Fission-track age of the Mangaroa ash and tectonic implications at Wellington, New Zealand.
C. W. Naeser, S. Nishimura, Te Punga
1980, New Zealand Journal of Geology and Geophysics (23) 615-621
Three samples of zircon from the Mangaroa Ash, an important marker bed in the late Pleistocene deposits of the Wellington area, have been dated by fission-track analysis. The average age of the 3 zircon samples is 380 000 years. Since this tephra fell, vertical uplift at Tinakori Hill on the...
Geodetic measurement of horizontal deformation across the Rio Grande rift near Socorro, New Mexico
J.C. Savage, M. Lisowski, W.H. Prescott, A.R. Sanford
1980, Journal of Geophysical Research Solid Earth (85) 7215-7220
Trilateration surveys of a geodetic network across the Rio Grande rift near Socorro, New Mexico, in 1972, 1973, 1976, and 1979 have failed to detect any significant strain accumulation. The surveys place an upper bound (95% confidence limit) of 1 mm/a (a = years) on east-west spreading cross the rift...
Geochemical exploration for uranium in playas
D. L. Leach, K.P. Puchlik, R.K. Glanzman
1980, Journal of Geochemical Exploration (13) 251-283
Playas and closed-basin lakes represent unique geochemical environments for the entrapment and concentration of mobile chemical elements. For this reason, playas may be considered as potentially favorable areas for the accumulation of uranium. We investigated playa sediments to determine their value as possible sample media for determining the presence...
Quantile estimation with more or less floodlike distributions
J. Maciunas Landwehr, N.C. Matalas, J.R. Wallis
1980, Water Resources Research (16) 547-555
The desirable properties of an estimator relative to a hypothetical population may be irrelevant in practice unless the population at issue more or less resembles the hypothetical population. Evidence that floods are distributed with long, stretched upper tails suggests that use of the more common distributions results in a rather...
Role of physical barriers in the control of sea lamprey (Petromyzon marinus)
J. B. Hunn, W.D. Youngs
1980, Canadian Journal of Fisheries and Aquatic Sciences (37) 2118-2122
Mechanical and electromechanical barriers played a significant role in the initial attempts to control sea lamprey (Petromyzon marinus) populations in the upper Great Lakes. More recently electromechanical weirs have been used to assess the relative abundance of spawning-run sea lampreys in Lake Superior. Development of an integrated control approach to...
Geochemical evolution of brines in the Salar of Uyuni, Bolivia.
S.L. Rettig, B.F. Jones, F. Risacher
1980, Chemical Geology (30) 57-79
Recent analyses of brines from the Salars of Uyuni and Coipasa have been compared with published data for Lakes Titicaca and Poopo to evaluate solute compositional trends in these remnants of two large Pleistocene lakes once connected by overflow from the N to the S of the Bolivian Altiplano. From...
Flood risks and the willingness to purchase flood insurance
M.R. Karlinger, E. D. Attanasi
1980, Water Resources Research (16) 617-622
Computer simulation experiments were conducted to determine the effects of alternative sources of uncertainty on the willingness to pay for flood insurance. Two alternative insurance protection schemes were investigated: coinsurance and fixed coverage. The question investigated here is to what extent does the insurance scheme influence how purchasers respond to...
Opaque minerals as aids in distinguishing between source and sorting effects on beach sand mineralogy in southwestern Oregon
G. Luepke
1980, Journal of Sedimentary Petrology (50) 489-496
Both source area and wave sorting affect the heavy-mineral distributions of beach sands. Although source and sorting effects are difficult to distinguish, they can be separated on four Oregon beaches by studying the magnetic fraction of the sand. Prominent headlands bound the four...
Epizootic of coccidiosis in free-flying lesser scaup (Aythya affinis)
R. M. Windingstad, M.E. McDonald, Louis N. Locke, S.M. Kerr, J.A. Sinn
1980, Avian Diseases (24) 1044-1049
A coccidiosis epizootic has occurred in lesser scaup (Aythya affinis) at Bluestem Reservoir in eastern Nebraska during the spring in each of three recent years: 1976-1978. Losses peaked during the period from mid-March through April. As much as 29% of the peak population of scaup using the reservoir died. Necropsies...
Distribution of modern benthic foraminifers on the New Jersey Outer Continental Shelf
C. Wylie Poag, H.J. Knebel, R. Todd
1980, Marine Micropaleontology (5) 43-69
We used samples from 21 stations within a 600 km2 area of the New Jersey Outer Continental Shelf to assess the effects of a hydrodynamic environment on the distribution and redistribution of benthic foraminifers. These samples show that, although the predominant genera (Elphidium, Cibicides, and Saccammina) are the same as...
Preparation and Presentation of Digital Maps in Raster Format
K. Edwards, R. M. Batson
1980, American Cartographer (7) 39-49
A set of algorithms has been developed at USGS Flagstaff for displaying digital map data in raster format. The set includes: FILLIN, which assigns a specified attribute code to units of a map which have been outlined on a digitizer and converted to raster format; FILBND, which removes the outlines;...
Comment on 'A reinterpretation of the linear heat flow and heat production relationship for the exponential model of the heat production in the crust' by R.N. Singh & J.G. Negi.
A.H. Lachenbruch
1980, Geophysical Journal of the Royal Astronomical Society (63) 791-795
In their recent paper, Singh & Negi, (This journal, 57, 741-744) contend that if thd slope of the empirical linear relation between heat flow and heat production is interpreted as the decay-length of an exponential depth-distribution of sources, a discrepancy rises, whereas if it is interpreted as the depth of...
Some constraints on levels of shear stress in the crust from observations and theory
Art McGarr
1980, Journal of Geophysical Research Solid Earth (85) 6231-6238
In situ stress determinations in North America, southern Africa, and Australia indicate that on the average the maximum shear stress increases linearly with depth to at least 5.1 km measured in soft rock, such as shale and sandstone, and to 3.7 km in hard rock, including granite and quartzite. Regression...
Geochemistry, strontium isotope data, and potassium-argon ages of the andesite-rhyolite association in the Padang area, West Sumatra
G. W. Leo, C. E. Hedge, R. F. Marvin
1980, Journal of Volcanology and Geothermal Research (7) 139-156
Quaternary volcanoes in the Padang area on the west coast of Sumatra have produced two-pyroxene, calc-alkaline andesite and volumetrically subordinate rhyolitic and andesitic ash-flow tuffs. A sequence of andesite (pre-caldera), rhyolitic tuff and andesitic tuff, in decreasing order of age, is related to Maninjau caldera. Andesite compositions range from 55.0...
Geoscientists for international development
David A. Hastings
1980, The British Geologist (6) 104-106
Professional societies are usually concerned with the advancement of scientific knowledge, but a relative newcomer to the international scene has a different focus - geoscience development in the Third World. David Hastings, a member of AGID, explains....
Fish-stock assessment in the Great Lakes
Wilbur L. Hartman
C. H. Hocutt, J. R. Stauffer Jr., editor(s)
1980, Book chapter, Biological monitoring of fish
No abstract available....
Metamorphic infrastructure in the northern Ruby Mountains, Nevada
Keith A. Howard
1980, Book chapter, Cordilleran metamorphic core complexes
The metamorphic complex of the northern Ruby Mountains in northeastern Nevada exposes Paleozoic strata that are metamorphosed to sillimanite grade, migmatized, and recumbently folded. Nappes are variously overturned to the east, north, south, and west. The deeper part of this metamorphic infrastructure is a migmatitic zone pervaded by pegmatitic two-mica...
Publications of the Geological Survey, 1879-1961
Water Resources Division, U.S. Geological Survey
1980, Report
This permanent catalog is a list of books and maps that were published between 1879 and 1961. It supplements another permanent catalog "Publications of the Geological Survey, 1962-1970."...
Earthquake prediction in the Soviet Union; an interview with I. L. Nersesov
H. Spall
1980, Earthquake Information Bulletin (USGS) (12) 60-63
Dr. I. L. Nersesov is a seismologist with the Institute of Physics of the Earth, Academy of Sciences of the U.S.S.R., Moscow. He is one of the leaders in the Soviet national program of earthquake prediction. ...
