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184617 results.

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Publication Extents

Not all publications have extents, not all extents are completely accurate
Emission spectrographic determination of volatile trace elements in geologic materials by a carrier distillation technique
H. N. Barton
1986, Journal of Geochemical Exploration (25) 367-378
Trace levels of chalcophile elements that form volatile sulfide minerals are determined in stream sediments and in the nonmagnetic fraction of a heavy-mineral concentrate of stream sediments by a carrier distillation emission spectrographic method. Photographically recorded spectra of samples are visually...
Effect of ground-water recharge on configuration of the water table beneath sand dunes and on seepage in lakes in the sandhills of Nebraska, U.S.A.
T. C. Winter
1986, Journal of Hydrology (86) 221-237
Analysis of water-level fluctuations in about 30 observation wells and 5 lakes in the Crescent Lake National Wildlife Refuge in the sandhills of Nebraska indicates water-table configuration beneath sand dunes in this area varies considerably, depending on the configuration of the topography of the dunes. If the topography of an...
Geochemical investigations of selected Eastern United States watersheds affected by acid deposition
Owen P. Bricker
1986, Journal of the Geological Society (143) 621-626
The effects of acid deposition on surface waters in eastern United States watersheds having similar size, physiography, climate and land use are related to the composition of the underlying bedrock. Watersheds developed on greenstone, calcareous shale, sandstone, granite, and schist differ in their ability to neutralize acid deposition....
Applications of UThPb isotope systematics to the problems of radioactive waste disposal
J. S. Stuckless
1986, Chemical Geology (55) 215-225
Concentrations of U, Th and Pb, and the isotopic composition of Pb for whole-rock samples of granitoids show: (1) that open-system behavior is nearly universal in the surface and near-surface environment; and (2) that elemental mobility is possible to depths of several hundred meters. Several identified or at least postulated...
A new view for resource managers
Robert H. Haas
1986, Rangelands (8) 99-102
In decades past, the rancher depended upon reports from cowboys to gather information he needed to make management decisions. Today, the vast open ranges of the cowboy era are mostly gone in the United States-fenced into pastures, paddocks, or fields that are now discrete management units. But fencing in the...
Paleomagnetism of the Tertiary Clarno Formation of central Oregon and its significance for the tectonic history of the Pacific Northwest
C. Sherman Gromme, Myrl E. Beck Jr., Ray E. Wells, David C. Engebretson
1986, Journal of Geophysical Research B: Solid Earth (91) 14089-14103
The Clarno Formation, a mostly Eocene and partly early Oligocene sequence of andesitic lavas and volcaniclastic rocks, is the oldest Tertiary formation exposed in north central Oregon. Remanent magnetization directions at 46 sites in the lavas provide a paleomagnetic pole at 84°N, 278°E with a 95% confidence cone of 7°....
Shallow subsurface temperature surveys in the Basin and Range province, U.S.A.-I. Review and evaluation
F. H. Olmsted, A. H. Welch, S. E. Ingebritsen
1986, Geothermics (15) 251-265
Temperature surveys at depths of 1–2 m have had varying success in geothermal exploration in the Basin and Range province. The most successful surveys have identified patterns of near-surface thermal-fluid flow within areas of less than 2 km2. Results have been less consistent in larger areas where zones of hydrothermal...
Recovering fresh water stored in saline limestone aquifers
M. L. Merritt
1986, Ground Water (24) 516-529
Numerical modeling techniques are used to examine the hydrogeologic, design, and management factors governing the recovery efficiency of subsurface fresh-water storage. The modeling approach permitted many combinations of conditions to be studied. A sensitivity analysis was used that consisted of varying certain parameters while keeping constant as many other parameters...
Changes in growth and maturity of walleyes associated with stock rehabilitation in western Lake Erie, 1964-1983
Kenneth M. Muth, David R. Wolfert
1986, North American Journal of Fisheries Management (6) 168-175
The precipitous decline in abundance of walleyes (Stizostedion vitreum vitreum) in western Lake Erie during the 1960s caused major concerns for the future of this resource. Mercury contamination in walleyes in 1970 resulted in a moratorium on commercial fishing in United States and Canadian waters. The opportunity arose for resource...
First records of a European cladoceran, Bythotrephes cederstroemi, in Lakes Erie and Huron
Michael T. Bur, David M. Klarer, Kenneth A. Krieger
1986, Journal of Great Lakes Research (12) 144-146
Adult forms of the cladoceran Bythotrephes cederstroemi Schoedler (Cercopagidae), a widespread European freshwater zooplankter, occurred in the stomachs of four common species of Lake Erie fish (yellow perch, Perca flavescens; white perch, Morone americana; white bass, M. chrysops; and walleye, Stizostedion vitreum vitreum) collected in early October 1985. The fish were collected at several stations in...
Distribution of submersed macrophytes in the St. Clair-Detroit River System, 1978
Donald W. Schloesser, Bruce A. Manny
1986, Journal of Freshwater Ecology (3) 537-544
An extensive survey was conducted in fall 1978 to determine the distribution and abundance of submersed macrophytes through the St. Clair-Detroit River system from Lake Huron to Lake Erie. Submersed macrophytes, representing 19 taxa, were widely distributed in the system, being found on 358 km2 (30%) of the total 1185 km2 of...
Earthquakes, January-February 1986
W. J. Person
1986, Earthquakes & Volcanoes (USGS) (18) 235-237
The first two months of the year were somewhat quiet seismically speaking. There were no major earthquakes (7.0-7.9) but one death was caused by an earthquake in Peru. In the United States a magntidue 4.9 earthquake in Ohio on January 31 caused some minor injuries and was felt in eleven states,...
SALTWATER INTRUSION IN A HIGHLY TRANSMISSIVE UNCONFINED AQUIFER.
Bradley G. Waller
1986, Conference Paper
Saltwater intrusion is particularly dynamic in coastal Dade County because of the high permeability of the Biscayne aquifer, because of the good interconnection between canals and the aquifer, and because of the seasonal rainfall. The problem is accentuated as urban growth continues to encroach on inland wetland areas which results...
A paleomagnetic and stable isotope study of the pluton at Rio Hondo near Questa, New Mexico: Implications for CRM related to hydrothermal alteration
J.T. Hagstrum, C.M. Johnson
1986, Earth and Planetary Science Letters (78) 296-314
Paleomagnetic and rock magnetic data combined with stable isotope data from the middle Tertiary pluton along the Rio Hondo in northern New Mexico suggest that its magnetic remanence has both thermal (TRM) and high-temperature chemical (CRM) components. Oxygen isotope temperatures indicate...
Distribution and habitat of Nitellopsis obtusa (Characeae) in the Laurentian Great Lakes
Donald W. Schloesser, Patrick L. Hudson, S. Jerrine Nichols
1986, Hydrobiologia (133) 91-96
Nitellopsis obtusa, a macroalga (Characeae) native to Europe and Asia, was found in U.S. waters of the St. Clair-Detroit River system in 1983, thus extending the range of this taxon into the Laurentian Great Lakes about 850 km from the St. Lawrence River where it was first discovered...