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Page 4763, results 119051 - 119075

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The occurrence and fission-track ages of late neogene and quaternary volcanic sediments, Siwalik group, Northern Pakistan
G.D. Johnson, P. Zeitler, C. W. Naeser, N.M. Johnson, D.M. Summers, C.D. Frost, N.D. Opdyke, R.A.K. Tahirkheli
1982, Palaeogeography, Palaeoclimatology, Palaeoecology (37) 63-93
Volcanic sediments, now mostly bentonites and bentonitic mudstones, occur throughout the Late Neogene and Quaternary Siwalik Group of northern Pakistan. A number of these deposits have been dated by the fission-track method, utilizing zircon phenocrysts from these deposits, and provide the chronometric constraints upon which a paleomagnetic stratigraphy is developed...
Chronology of late Wisconsinan glaciation in middle North America
L. Clayton, S.R. Moran
1982, Quaternary Science Reviews (1) 55-82
We propose a chronology of late Wisconsinan glacial fluctuations in middle North America, from Alberta to Wisconsin, based on radiocarbon dates derived solely from wood. Previous chronologies of the southwestern margin of the North American Continental Ice Sheet have depended to a considerable degree on radiocarbon dates from fine-grained organic...
An oilspill trajectory analysis model with a variable wind deflection angle
W.B. Samuels, N.E. Huang, D.E. Amstutz
1982, Ocean Engineering (9) 347-360
The oilspill trajectory movement algorithm consists of a vector sum of the surface drift component due to wind and the surface current component. In the U.S. Geological Survey oilspill trajectory analysis model, the surface drift component is assumed to be 3.5% of the wind speed and is rotated 20 degrees...
Photogrammetric application of Viking Orbital photography
S.S.C. Wu, A.A. Elassal, R. Jordan, F.J. Schafer
1982, Planetary and Space Science (30) 45-55
Special techniques are described for the photogrammetric compilation of topographic maps and profiles from stereoscopic photographs taken by the two Viking Orbiter spacecraft. These techniques were developed because the extremely narrow field of view of the Viking cameras precludes compilation by conventional photogrammetric methods. The techniques adjust for internal consistency...
An electric-analog simulation of elliptic partial differential equations using finite element theory
O.L. Franke, G.F. Pinder, E.P. Patten
1982, Mathematics and Computers in Simulation (24) 65-71
Elliptic partial differential equations can be solved using the Galerkin-finite element method to generate the approximating algebraic equations, and an electrical network to solve the resulting matrices. Some element configurations require the use of networks containing negative resistances which, while physically realizable, are more expensive and time-consuming to construct....
Mitigation and enhancement techniques for the Upper Mississippi River system and other large river systems
Rosalie A. Schnick, John M. Morton, Jeffrey C. Mochalski, Jonathan T. Beall
1982, Resource Publication 149
Extensive information is provided on techniques that can reduce or eliminate the negative impact of man's activities (particularly those related to navigation) on large river systems, with special reference to the Upper Mississippi River. These techniques should help resource managers who are concerned with such river systems to establish...
Water resources data, Indiana, water year 1981
Water Resources Division, U.S. Geological Survey
1982, Water Data Report IN-81-1
Water resources data for the 1981 water year for Indiana consists of records of stage, discharge, and water quality of streams; stage and contents of lakes and reservoirs; and water levels in wells. This report contains discharge records for 195 gaging stations, stage and contents for 12 lakes and reservoirs,...
Water quality of Canyon Lake, central Texas
W.R. Roddy, K.M. Waddell
1982, Open-File Report 82-678
The volume-weighted average concentrations of the principal dissolved constituents in Canyon Lake on the Guadalupe River in central Texas are usually less than 240 milligrams per liter of dissolved solids, 20 milligrams per liter of chloride, and 30 milligrams per liter of sulfate. The water, which is very hard, has...
Data management system for USGS/USEPA urban hydrology studies program
W.H. Doyle Jr., J.A. Lorens
1982, Open-File Report 82-442
A data management system was developed to store, update, and retrieve data collected in urban stormwater studies jointly conducted by the U.S. Geological Survey and U.S. Environmental Protection Agency in 11 cities in the United States. The data management system is used to retrieve and combine data from USGS data...
Origin of the Mariano Lake uranium deposit, McKinley County, New Mexico
Neil S. Fishman, Richard L. Reynolds
1982, Open-File Report 82-888
The Mariano Lake uranium deposit, hosted by the Brushy Basin Member of the Jurassic Morrison Formation, occurs in the trough of an east-west trending syncline at the western end of the Smith Lake-Mariano Lake group of uranium deposits near Crownpoint, New Mexico. The orebody, which contains abundant amorphous organic material,...