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Uranium-lead isochron age and preliminary sulfur isotope systematics of the Felder uranium deposit, south Texas
K.R. Ludwig, Martin B. Goldhaber, Richard L. Reynolds, Kathleen R. Simmons
1982, Economic Geology (77) 557-563
Uranium-lead isotope systematics of roll-front ores in Miocene sandstone at the Felder and McLean uranium deposits (south Texas coastal plain) give a well-defined 207 Pb/ 204 Pb- 235 U/ 204 Pb isochron age of 5.07 + or - 0.15 m.y. The relatively slight degree of scatter of the points defining the isochron is probably due to initial Pb...
Biogenic and nonbiogenic ore-forming processes in the south Texas uranium district; evidence from the Panna Maria deposit
Richard L. Reynolds, Martin B. Goldhaber, D. Carpenter
1982, Economic Geology (77) 541-556
Geochemical and petrographic studies of core samples from the Panna Maria uranium deposit, a roll-type orebody in the Eocene Jackson Group in Karnes County, Texas, yield important information on the origin of the deposit. Organic carbon content averages about 0.42 weight percent in reduced rock and correlates postively with sulfur...
Acute and chronic toxicity studies with monochlorobenzene in rainbow trout
George M. Dalich, R. E. Larson, William H. Gingerich
1982, Aquatic Toxicology (2) 127-142
The toxicity of monochlorobenzene (CB) was investigated in rainbow trout following acute intraperitoneal (i.p.) administration and chronic exposure via the water in a continuously flowing system for 15 or 30 days.In the acute study overt toxicity and hepatotoxicity were monitored over a 96-h time period. Variables measured to assess toxicity...
Temperature dependence of unsaturated hydraulic conductivity of two soils
Jim Constantz
1982, Soil Science Society of America Journal (46) 466-470
Packed columns of Oakley sand (mixed, mesic Typic Paleudalfs) and Hanford sandy loam (mixed, nonacid, thermic Typic Xerorthents) were used to develop isothermal steady-state fluxes. Soil matric potentials were measured and unsaturated hydraulic conductivities were calculated over a range of matric potentials at 2°, 25°, and 45° ± 0.5°C. In...
Lakes and lake-like waters of the Hawaiian Archipelago
J. A. Maciolek
1982, Occasional Papers Bernice P. Bishop Museum (25) 1-14
This summary of Hawaiian lacustrine limnology is based on 12 years of field and literature surveys of archipelagic inland waters. Lakes here are distinguished from other standing waters by limits on surface oceanic area (> 0.1 ha) and depth (> 2 m), and by the absence of flatural surface oceanic connection....
Geomagnetic Workshop
John M. DeNoyer, J.C. Cain, S. Banerjee, E.R. Benton, Richard J. Blakely, Robert S. Coe, C.G.A. Harrison, Malcolm J. S. Johnston, R.D. Regan
1982, Eos, Transactions, American Geophysical Union (63) 645-648
A workshop on geomagnetism, sponsored by the Geologic Division of the U.S. Geological Survey, was held in the Denver West Office Complex in Golden, Colorado, April 13–15, 1982. There were 90 registered participants from government agencies, academic institutions, and industry.This effort stemmed from the realization that geomagnetism, once a small...
Organochlorine residues and shell thinning in Oregon seabird eggs
Charles J. Henny, Lawrence J. Blus, Richard M. Prouty
1982, Murrelet (63) 15-21
A single egg was collected at 62 nests of 10 seabird species from Oregon in 1979. The eggs were analyzed for organochlorine contaminants; contemporary shell thickness was compared with eggshells collected during earlier time periods. Concentrations of DDE and PCB's in 1979 were generally low with the most contaminated species...
On conducting the modified ‘Slug’ test in tight formations
C.E. Neuzil
1982, Water Resources Research (18) 439-441
The method introduced by Bredehoeft and Papadopulos (1980) for conducting a modified ‘slug’ test in tight formations does not assure the condition of approximate equilibrium necessary at the start of the test. In addition, compressibility in the shut-in well can be significantly larger than the compressibility of water, which Bredehoeft...
Volatilization of ketones from water
R. E. Rathbun, D. Y. Tai
1982, Water, Air, & Soil Pollution (17) 281-293
The overall mass-transfer coefficients for the volatilization from water of acetone, 2-butanone, 2-pentanone, 3-pentanone, 4-methyl-2-pentanone, 2-heptanone, and 2-octanone were measured simultaneously with the oxygen-absorption coefficient in a laboratory stirred water bath. The liquid-film and gas-film coefficients of the two-film model were determined for the ketones from the overall coefficients,...
Habitat models for land-use planning: assumptions and strategies for development
Adrian H. Farmer, Michael J. Armbruster, James W. Terrell, Richard L. Schroeder
1982, Book, Transactions of the Forty-seventh North American Wildlife and Natural Resources Conference: Population pressures and natural resource management needs
Wildlife managers have long recognized that management goals must be constrained by the availability and suitability of habitat. This recognition, combined with ever increasing land development pressures, has resulted in environmental legislation emphasizing systematic approaches to collection and analysis of habitat information. Wildlife planners have responded with a...
Lumber spill in central California waters: Implications for oil spills and sea otters
G.R. VanBlaricom, R.J. Jameson
1982, Science (215) 1503-1505
A large quantity of lumber was spilled in the ocean off central California during the winter of 1978, and it spread through most of the range of the threatened California sea otter population within 4 weeks. The movement rates of lumber were similar to those of oil slicks observed elsewhere....
Mid-Paleozoic age of the Roberts thrust unsettled by new data from northern Nevada
Keith B. Ketner, Fred J. Smith Jr.
1982, Geology (10) 298-303
The Roberts thrust is a major thrust in Nevada on which Ordovician to Devonian siliceous facies rocks were carried more than 80 km eastward over contemporaneous carbonate facies. For more than two decades, a mid-Paleozoic age for this structure has been widely accepted. The bases for dating the thrust are...
Molecular size of aquatic humic substances
E.M. Thurman, R.L. Wershaw, Ronald L. Malcolm, D.J. Pinckney
1982, Organic Geochemistry (4) 27-35
Aquatic humic substances, which account for 30 to 50% of the organic carbon in water, are a principal component of aquatic organic matter. The molecular size of aquatic humic substances, determined by small-angle X-ray scattering, varies from 4.7 to 33 Å in their radius of gyration, corresponding to a molecular...
Optimum nonparametric estimation of population density based on ordered distances
S.A. Patil, J.L. Kovner, Kenneth P. Burnham
1982, Biometrics (38) 243-248
The asymptotic mean and error mean square are determined for the nonparametric estimator of plant density by distance sampling proposed by Patil, Burnham and Kovner (1979, Biometrics 35, 597-604. On the basis of these formulae, a bias-reduced version of this estimator is given, and its specific form is determined...