B. R. Berger, M.L. Silberman, Randolph A. Koski
1975, Economic Geology (70) 1487-1491
No abstract available....
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Publication Extents
Not all publications have extents, not all extents are completely accurateMaurice A. Chaffee
1975, Economic Geology (70) 995-995
No abstract available....
R. H. Wright, R. H. Campbell, T. H. Nilsen
1975, Geology (3) 217-218
No abstract available....
George J. Neuerburg
1975, Journal of Research of the U.S. Geological Survey (3) 377-378
Some minerals of silicate rocks can be quantitatively recovered from rock fragments by prolonged digestion in cold, concentrated hydrofluoric acid. The procedure yields clean, physically unharmed crystals, mostly of minerals that occur largely or only in trace amounts....
Travis Hudson, Gerald Askevold, George Plafker
1975, Journal of Research of the U.S. Geological Survey (3) 369-375
We have examined several computer systems to see how they could aid information processing of geologic field data. The processing procedure we have chosen combines a systematic note-taking technique, a computer text-editor for creating files of data, and automated printing of selected data or of complete file copies. Traditional text...
Elmer S. Santos
1975, Journal of Research of the U.S. Geological Survey (3) 363-368
A redistribution of radium-226 in uranium ore deposits produces a characteristic pattern of disequilibrium in which uranium is greater than equivalent uranium in high-grade samples and equivalent uranium is greater than uranium in low-grade samples. The redistribution is a continuous process in uranium deposits, and the resulting pattern of disequilibrium...
Robert I. Tilling, Robert Y. Koyanagi, Robin T. Holcomb
1975, Journal of Research of the U.S. Geological Survey (3) 345-361
During August 7-13, 1972, intense and sustained rockfall activity occurred in Makaopuhi Crater on the east-rift zone of Kilauea Volcano. In a 4-day period (August 7-10), approximately 270,000 m3 of rockfall debris accumulated in Makaopuhi's west pit, representing a total kinetic energy release of about 101B ergs. Because the rockfalls...
Bruce Bryant, Terry W. Offield, Paul W. Schmidt
1975, Journal of Research of the U.S. Geological Survey (3) 295-303
Comparison of orientation of faults, foliations, and joints, observed during geologic mapping in Colorado, with thermal, photographic, and topographic linears shows that topographic linears are statistically useful indicators of mappable faults and fractures, photographic linears are less useful, and thermal linears, believed to represent zones of moisture concentration, are parallel...
R. Ernest Anderson, R. L. Laney
1975, Journal of Research of the U.S. Geological Survey (3) 337-343
At Lake Mead, contrasts in permeability of upper Cenozoic sediments show a better correlation with irregularly distributed impoundment-related seismicity than do contrasts in structure. An evaluation of structures developed during the late Cenozoic fails to explain the erratic distribution of seismicity. An evaluation of the late Cenozoic stratigraphy, however, shows...
Donal R. Mullineaux, Jack H. Hyde, Meyer Rubin
1975, Journal of Research of the U.S. Geological Survey (3) 329-335
Pumice layers composing four different groups of tephra beds (termed "sets"), whose stratigraphy, age, and trend away from Mount St. Helens are fairly well known, are potentially valuable stratigraphic markers in the northwestern United States and adjacent parts of Canada. All four tephra sets are less than about 18,000 yr...
Dennis P. Cox, Ileana Perez Gonzalez, J. Thomas Nash
1975, Journal of Research of the U.S. Geological Survey (3) 313-327
The Sapo Alegre prospect, a small porphyry copper-molybdenum occurrence in west-central Puerto Rico, is characterized by distinct zones of alteration and mineralization of quartz diorite porphyry. A biotite-chlorite zone in the porphyry near its contact with surrounding metavolcanic rocks contains copper, molybdenum, gold, silver, selenium, and tellurium. A quartz-sericite-pyrite zone...
J. E. Johnston, R. L. Miller, K. J. Englund
1975, Journal of Research of the U.S. Geological Survey (3) 285-293
Remote sensing is the technology of studying distant objects by measuring and recording energy from one or more segments of the electromagnetic spectrum. Imaging sensors which operate from medium- and high-altitude aircraft or from spacecraft can provide a synoptic view of large areas and of surface phenomena not evident in...
E. J. Young, P. L. Hauff
1975, Journal of Research of the U.S. Geological Survey (3) 305-311
Disseminated uraninite occurs in Wheeler Basin, Grand County, Colo., about 5 mi (8 km) southeast of Monarch Lake, in Precambrian metamorphic rocks consisting of migmatized gneiss and mixed gneiss and pegmatite. An intrusion of Precambrian Y Silver Plume Granite lies within 400 ft (122 m) of the occurrence. The...
Bryan M. Leonard, R.W. Larson
1975, Journal of Glaciology (14) 445-457
The study of ice in the upper Great Lakes, both from the operational and the scientific points of view, is receiving continued attention. Quantitative and qualitative field work is being conducted to provide the needed background for accurate interpretation of remotely sensed data. The data under discussion in this paper...
A. Van Velzen, J.F. Kreitzer
1975, Journal of Wildlife Management (39) 305-309
The LC50 (concentration of toxicant in the diet expected to kill half of the test birds in 5 days) for p,p' -DDT in clapper rails (Rallus longirostris) was found to be 1,612 ppm for males and 1,896 ppm for females. Amounts of DDT + DDD in the brains of...
P. E. McAllister, R.R. Wagner
1975, Journal of Virology (15) 733-738
Purified infectious hematopoietic necrosis (IHN) virus and the virus of haemorrhagic septicaemia (VHS) (Egtved virus) each contain five structural proteins which were designated L, G, N, M-1, and M-2. The IHN viral polypeptides have molecular weights estimated to be 157,000, 72,000, 40,000, 25,000 and 20,000, respectively, whereas those of VHS...
A.E. Thomas
1975, Transactions of the American Fisheries Society (104) 335-337
Eyed eggs of chinook salmon (Oncorhynchus tshawytscha) were planted in the Abernathy (Washington) incubation channel at concentrations of 7,180, 10,764, and 14,349 eggs/m2 of gravel. Numbers of eggs planted were 200,000, 240,000, and 200,800, and survivals to the downstream migrant stage were 78.5, 85.0, and 79.1%, respectively; the differences were not...
G.L. Pearson, D.A. Pass, E.C. Beggs
1975, Journal of Wildlife Diseases (11) 224-228
Natural pox infection occurred in a free-living rough-legged hawk (Buteo lagopus) in northeastern North Dakota. Gross, histological and electron microscopic findings were typical of pox infection, and characteristic lesions developed in red-tailed hawks (Buteo jamaicensis) but not in great horned owls (Bubo virginianus) following inoculation with case material. Death of...
J. Thomas Nash
1975, Economic Geology (70) 1448-1462
Base and precious metal ores valued in excess of $300 million have been mined from vein, pipe, and replacement deposits located on the northwest side of, and structurally related to, the middle Tertiary Silverton caldera. A belt of normal faults radial to the caldera contains veins which have been mined...
J. Thomas Nash
1975, Economic Geology (70) 1038-1049
Fissure-filling and replacement Pb-Zn-Cu-Au-Ag ores of the Mayflower mine occur in calcareous sedimentary and intrusive wall rocks over a vertical interval of 3,000 feet. The ores are exceptional in the district for their chalcopyrite and gold content and for the unusual associated gangue minerals anhydrite, chlorite, and hematite. High oxygen...
John R. Crippen
1975, Open-File Report 1002-37
No abstract available....
Robert H. Meade, Peter L. Sachs, Frank T. Manheim, J.C. Hathaway, Derek Spencer
1975, Journal of Sedimentary Research (78) 171-188
Suspended matter collected in the Middle Atlantic Bight (the coastal segment of the United States between Cape Cod and Cape Hatteras) in September 1969 was predominantly organic: an average of 80% combustible organic matter in surface waters and 40)% near bottom. Total suspended concentrations decreased between the inner shelf and...
J. Larry Ludke, Elwood F. Hill, Michael P. Dieter
1975, Archives of Environmental Contamination and Toxicology (3) 1-21
Patterns of mortality and inhibition of brain and plasma ChE in birds treated with ChE inhibitors were studied in an attempt to determine the validity of using ChE activity as a monitoring and diagnostic technique. Analysis of brain ChE activity proved to be reliable for diagnosing and monitoring effects of...
Richard Merriam, James L. Bischoff
1975, Journal of Sedimentary Research (45) 207-211
No abstract available....
Thomas Miller, Ivan Barnes, William Wallace Patton Jr.
1975, Journal of Research of the U.S. Geological Survey (3) 149-162
Numerous hot springs occur in a variety of geologic provinces in west-central Alaska. Granitic plutons are common to all the provinces, and the hot springs are spatially associated with the contacts of these plutons. Of 23 hot springs whose bedrock geology is known, all are within 4.8 km (3 mi)...