Nocturnal activity and foraging of prairie raccoons (Procyon lotor) in North Dakota
Raymond J. Greenwood
1982, American Midland Naturalist (107) 238-243
Nocturnal activity and foraging of 39 radio-equipped raccoons (Procyon lotor) in eastern North Dakota were studied from April-July in 1974-1976. Sixteen of the raccoons were collected after foraging bouts for stomach content analysis. Raccoon activity consisted of running (13%), walking (49%) and local movement in confined areas (38%). Local movement...
Worth of geophysical data in natural- disaster- insurance rate setting.
E. D. Attanasi, M.R. Karlinger
1982, Journal of Applied Meteorology and Climatology (21) 453-460
Insurance firms that offer natural-disaster insurance base their rates on available information. The benefits from collecting additional data and incorporating this information to improve parameter estimates of probability distributions that are used to characterize natural-disaster events can be determined by computing changes in premiums as a function of additional data....
Limits to northward drift of the Paleocene Cantwell Formation, central Alaska
John W. Hillhouse, C. S. Grommé
1982, Geology (10) 552-556
Volcanic rocks of the Paleocene Cantwell Formation in central Alaska apparently originated at a paleolatitude of 83°N (α95 = 9.7°), as indicated by paleomagnetic results. When compared with the Paleocene pole for the North American craton, the 95% confidence limits of the results suggest...
Techniques of trend analysis for monthly water quality data
Robert M. Hirsch, James R. Slack, Richard A. Smith
1982, Water Resources Research (18) 107-121
Some of the characteristics that complicate the analysis of water quality time series are non-normal distributions, seasonality, flow relatedness, missing values, values below the limit of detection, and serial correlation. Presented here are techniques that are suitable in the face of the complications listed above for the exploratory analysis of...
Space platform albedo measurements as indicators of change in arid lands
C.J. Robinove
1982, Advances in Space Research (2) 31-35
The change in albedo of arid lands is an indicator of changes in their condition and quality, including density of vegetative cover, erosion, deposition, surficial soil moisture, and man-made change. In general, darkening of an arid land surface indicates an increase in land quality while brightening indicates a decrease in...
Contemporary block tectonics: California and Nevada
D.P. Hill
1982, Journal of Geophysical Research Solid Earth (87) 5433-5450
Well-determined fault plane solution and the gross pattern of late-Cenozoic faulting in California and Nevada show a systematic relation between the orientation of fault planes and slip directions. In general, normal faults have northerly strikes, reverse faults have easterly strikes, and dextral and sinstral strike slip faults have northwesterly and...
Cretaceous biostratigraphy in the Wyoming thrust belt.
D. J. Nichols, S.R. Jacobson
1982, Mountain Geologist (19) 73-78
In the Cretaceous section of the thrust belt, fossils are especially useful for dating and correlating repetitive facies of different ages in structurally complex terrain. The biostratigraphic zonation for the region is based on megafossils (chiefly ammonites) , which permit accurate dating and correlation of outcrop sections, and which have...
Bank stability and channel width adjustment, East Fork River, Wyoming
E.D. Andrews
1982, Water Resources Research (18) 1184-1192
Frequent surveys of eight cross sections located in self-formed reaches of the East Fork River, Wyoming, during the 1974 snowmelt flood showed a close relation between channel morphology and scour and fill. Those cross sections narrower than the mean reach width filled at discharges less than bankfull and scoured at...
Two-dimensional compressional wave velocity structure under San Francisco Volcanic Field, Arizona, from teleseismic P residual measurements
D.A. Stauber
1982, Journal of Geophysical Research Solid Earth (87) 5451-5459
A low compressional-wave velocity region in the midcrust below the San Francisco Mountain stratovolcano, Arizona, has been detected by the teleseismic P residual technique. This region is approximately 6 km wide, lies between elevations of 9 km and 34 km below sea level, and has a compressional velocity reduction of more than...
Scavenging rates of invertebrates in an eastern deciduous forest
Gary M. Fellers, Joan H. Fellers
1982, American Midland Naturalist (107) 389-392
Rates at which scavengers located three types of dead insects were measured. All dead insects were taken by ants with a median time of 3.75 min (range 0.33-36 min). This gives strong indirect evidence that such food is in short supply....
The effect of natural weathering on the chemical and isotopic compositions of biotites
Norbert Clauer, J. R. O’Neil, C. Bonnot-Courtois
1982, Geochimica et Cosmochimica Acta (46) 1755-1762
The effect of progressive natural weathering on the isotopic (Rb-Sr, K-Ar, δD, δ18O) and chemical (REE, H2O+) compositions of biotite has been studied on a suite of migmatitic biotites from the Chad Republic. During the early stages of weathering the Rb-Sr system is strongly affected, the hydrogen and oxygen isotope compositions...
Origin and evolution of the Nakhla meteorite inferred from the Sm-Nd and U-Pb systematics and REE, Ba, Sr, Rb and K abundances
N. Nakamura, D.M. Unruh, M. Tatsumoto, R. Hutchison
1982, Geochimica et Cosmochimica Acta (46) 1555-1573
Analyses of Sm-Nd and U-Th-Pb systematics, REE, Ba, Sr, Rb and K concentrations were carried out for whole rock and mineral separates from the Nakhla meteorite. The 1.26 ±.07 b.y. Sm-Nd age obtained in this work is in good agreement with those previously obtained by the Rb-Sr and Ar-Ar methods. The...
The 57Fe Mössbauer parameters of pyrite and marcasite with different provenances
B.J. Evans, R. G. Johnson, F. E. Senftle, C. B. Cecil, F. Dulong
1982, Geochimica et Cosmochimica Acta (46) 761-775
Eighteen pyrite and twelve marcasite samples which have different provenances have been investigated to determine the systematics of the influence of mineralogical and geological factors on the 57Fe Mössbauer spectra at 298 K. The following results have been obtained: there is no ambiguity in distinguishing single phase pyrite from single...
Analytical electron microscopy in mineralogy; exsolved phases in pyroxenes
Gordon L. Nord Jr.
1982, Ultramicroscopy (8) 109-119
Analytical scanning transmission electron microscopy has been successfully used to characterize the structure and composition of lamellar exsolution products in pyroxenes. At operating voltages of 100 and 200 keV, microanalytical techniques of x-ray energy analysis, convergent-beam electron diffraction, and lattice imaging have been used to chemically and structurally characterize exsolution...
Sample design for estimating change in land use and land cover ( Pennsylvania).
G.H. Rosenfield
1982, Photogrammetric Engineering and Remote Sensing (48) 793-801
The methodology of sample design which is applied to estimating change in land use and land cover is general and extendable to determination of change in any type of thematic mapping that is time variant. Land-use maps of the State of Pennsylvania at a scale of 1:250,000 were compiled circa...
Evolution of geothermal fluids deduced from chemistry plots: Yellowstone National Park (U.S.A.)
E. Mazor, J. M. Thompson
1982, Journal of Volcanology and Geothermal Research (12) 351-360
Large amounts of chemical data, obtained in geothermal fields, may readily be sorted-out by the aid of a simple set of graphs that provide a clear over-all picture and facilitate the understanding of geochemical processes taking place. As a case study, data from several hundred samples of the thermal springs...
Optimal dynamic management of groundwater pollutant sources
Steven M. Gorelick, Irwin Remson
1982, Water Resources Research (18) 71-76
The linear programing-superposition method is presented for managing multiple sources of groundwater pollution over time. The method uses any linear solute transport simulation model to generate a unit source-concentration response matrix that is incorporated into a management model. This series of constraints indicates local solute concentration histories that will result...
Depositional setting and diagenetic evolution of some Tertiary unconventional reservoir rocks, Uinta Basin, Utah
Janet K. Pitman, T. D. Fouch, M. B. Goldhaber
1982, American Association of Petroleum Geologists Bulletin (66) 1581-1596
The Douglas Creek Member of the Tertiary Green River Formation underlies much of the Uinta basin, Utah, and contains large volumes of oil and gas trapped in a complex of fractured low-permeability sandstone reservoirs. In the southeastern part of the basin at Pariette Bench, the Eocene Douglas Creek Member is...
An equation correlating the solubility of quartz in water from 25° to 900°C at pressures up to 10,000 bars
Robert O. Fournier, Robert W. Potter II
1982, Geochimica et Cosmochimica Acta (46) 1969-1973
The solubility of quartz in water from 25° to 900°C at specific volume of the solvent ranging from about 1 to 10 and from 300° to 600°C at specific volume of the solvent ranging from about 10 to 100 is given by an empirically derived equation of the form: log m = A + B(log V)...
Geothermal systems of the Cascade Range
L.J. Muffler, Charles R. Bacon, W. A. Duffield
1982, Conference Paper, Proceedings of Pacific Geothermal Conference 1982
In the central and southern Cascade Range, plate convergence is oblique, and Quaternary volcanism produces mostly basalt and mafic andesite; large andesite-dacite composite volcanoes and silicic dome fields occur in restricted areas of long-lived igneous activity. To the north, plate convergence is normal, producing widely spaced centers in which mafic...
Morphology, distribution, and development of submarine canyons on the United States Atlantic continental slope between Hudson and Baltimore Canyons
David C. Twichell, David G. Roberts
1982, Geology (10) 408-412
The distribution and morphology of submarine canyons off the eastern United States between Hudson and Baltimore Canyons have been mapped by long-range sidescan sonar. In this area canyons are numerous, and their spacing correlates with overall slope gradient; they are absent where the gradient is less than 3°, are 2...
Exotic terranes of western California
M.O. McWilliams, D. G. Howell
1982, Nature (297) 215-217
Numerous distinct geological terranes compose the North American Cordillera1; there may be as many as 50 terranes in California alone2. Critical to deciphering the history of Cordilleran tectonic assembly is an understanding of the displacement history of individual terranes. It is therefore important to know: (1) whether a terrane has...
Modeling of tidal and residual circulation in San Francisco Bay, California
R. T. Cheng
1982, Conference Paper, Proceedings, Seminar on 2-D Flows
Several numerical models have been developed and implemented to simulate tidal and residual circulation in San Francisco Bay. Because of a broad distribution in time scales, hydrodynamic models must be formulated to account for the proper time and spatial scales which dominate the transport processes. A complete current survey of...
Low-frequency variations in sea level and currents in south San Francisco Bay
Roy A. Walters
1982, Journal of Physical Oceanography (12) 658-668
In order to examine physical process in the subtidal time range, sea-level and current meter data for south San Francisco Bay (South Bay) were filtered using a low-pass digital filter to remove tidal period variations. and then subjected to an empirical orthogonal function analysis. For the sea-level data, there is...
Removing tidal-period variations from time-series data using low-pass digital filters
Roy A. Walters, Cynthia Heston
1982, Journal of Physical Oceanography (12) 112-115
Several low-pass, digital filters are examined for their ability to remove tidal Period Variations from a time-series of water surface elevation for San Francisco Bay. The most efficient filter is the one which is applied to the Fourier coefficients of the transformed data, and the filtered data recovered through an...
