Numerical simulation of dissolved silica in the San Fancisco Bay
David H. Peterson, John F. Festa, T. J. Conomos
1978, Estuarine and Coastal Marine Science (7) 99-116
A two-dimensional (vertical) steady-state numerical model that simulates water circulation and dissolved-silica distributions is applied to northern San Francisco Bay. The model (1) describes the strong influence of river inflow on estuarine circulation and, in turn, on the biologically modulated silica concentration, and (2) shows how rates of silica uptake...
A field evaluation of subsurface and surface runoff. II. Runoff processes
D.H. Pilgrim, D.D. Huff, T.D. Steele
1978, Journal of Hydrology (38) 319-341
Combined use of radioisotope tracer, flow rate, specific conductance and suspended-sediment measurements on a large field plot near Stanford, California, has provided more detailed information on surface and subsurface storm runoff processes than would be possible from any single approach used in isolation. Although the plot was surficially uniform, the...
Meteorite impact crater in central Alaska
W. W. Patton Jr., T. P. Miller
1978, Science (201) 279-279
No abstract available....
Seismic amplitude measurements suggest foreshocks have different focal mechanisms than aftershocks
A. Lindh, G. Fuis, C. Mantis
1978, Science (201) 56-59
The ratio of the amplitudes of P and S waves from the foreshocks and aftershocks to three recent California earthquakes show a characteristic change at the time of the main events. As this ratio is extremely sensitive to small changes in the orientation of the fault plane, a small systematic...
Stratigraphy of the Atlantic Continental Shelf and Slope of the United States
Claude (Wylie) Poag
1978, Annual Review of Earth and Planetary Sciences (6) 251-280
No abstract available....
Erythrocyte δ-Aminolevulinic Acid Dehydratase Activity in Mallard Ducks: Duration of Inhibition after Lead Shot Dosage
M. P. Dieter, M. T. Finley
1978, Journal of Wildlife Management (42) 621-625
Inhibition of a lead-specific blood enzyme, 8-aminolevulinic acid dehydratase (ALAD), has been utilized to indicate the incidence and degree of lead contamination in canvasback ducks (Aythya valisineria) (Dieter et al. 1976). This variable was found to be more sensitive to lead than previous tests that have been employed with...
Age and sex determination of juvenile band-tailed pigeons
J.A. White, C.E. Braun
1978, Journal of Wildlife Management (42) 564-569
Captive band-tailed pigeons (Columba fasciata) were studied to document progression of molts and plumages from juvenal to adult age. Immature pigeons began the post-juvenal molt at 35 days which continued up to 340 days. The only 3 plumage characters useful for identification and estimation of age were presence of juvenal...
Preliminary evaluation of the floating dome method of measuring reaeration rates
Doyle W. Stephens
1978, Journal of Research of the U.S. Geological Survey (6) 547-552
The floating dome method of measuring reaeration rates was evaluated using a modified tracer technique and a disturbed equilibrium technique. The lack of agreement between results of the floating dome method and the other methods was attributed to limitations in instrument accuracy amplified by physical relationships of the dome to...
Definition of regional relationships between dissolved solids and specific conductance, Susquehanna River basin, Pennsylvania and New York
David J. Lystrom, Frank A. Rinella, William D. Knox
1978, Journal of Research of the U.S. Geological Survey (6) 541-545
This report presents statistical tests for assessing the accuracy and validity of two regional models of the relationship between dissolved-solids concentration and specific conductance. These models are used to estimate dissolved-solids concentrations based on specific-conductance measurements. The two regional models are compared with station models for 27 stream sites in...
Accuracy of flood mapping
D. E. Burkham
1978, Journal of Research of the U.S. Geological Survey (6) 515-527
Information taken directly from published and unpublished reports was used to appraise the accuracy and the limitations of the three general flood-mapping methods: detailed, historical, and physiographic. In the appraisal, the probable nationwide average standard error of estimate for water depth and elevation in percentage of depth and in meters...
Spectral gradient of lunar radiobrightness: Heat flow or volume scattering?
A. W. England, G. R. Johnson
1978, Journal of Research of the U.S. Geological Survey (6) 505-509
Lunar heat flow cannot be derived unambiguously from the spectral gradient of the radiobrightness. Volume scattering of microwaves by rock clasts within the lunar regolith results in a spectral component in the 5- to 30-centimeter range of wavelengths that is a significant fraction of that resulting from lunar heat flow....
Discrimination of fluvial and eolian deposits by number-frequency analysis of sediments of sand through silt size from a point bar, Rio Puerco, New Mexico
R. G. Shepherd, D. L. Macke
1978, Journal of Research of the U.S. Geological Survey (6) 499-504
Fluvial and eolian deposits are interbedded in ephemeral-stream, arid-region point bars in the channel of the Rio Puerco, west of Albuquerque, N. Mex. Number frequency distributions of grain size for both types of deposits were obtained using an electronic automatic image analyzer for a suite of 10 samples. The number-frequency...
Uranium in waters and aquifer rocks at the Nevada Test Site, Nye County, Nevada
Robert A. Zielinski, John N. Rosholt
1978, Journal of Research of the U.S. Geological Survey (6) 489-498
Previous chemical, geological, and hydrological information describing the physical and chemical environment of the Nevada Test Site (a Federal reserve for the testing of nuclear explosive devices) has been combined with new radiochemical and isotope data for water and rock samples in order to explain the behavior of uranium during...
Recognition of oxidized sulfide minerals as an exploration guide for uranium
Richard L. Reynolds, Martin B. Goldhaber
1978, Journal of Research of the U.S. Geological Survey (6) 483-488
The difference in color between tan to red oxidized sandstone and gray reduced sandstone on either side of the reduction-oxidation (redox) interface, which is- the locus of uranium concentration in roll-type deposits, has been noted and used locally as an exploration guide within known uranium districts. Reduced sandstone is...
Differentiation of the sulfides in the Basal Zone of the Stillwater Complex, Montana
Norman J. Page, F.O. Simon
1978, Journal of Research of the U.S. Geological Survey (6) 473-482
Chemical leaching and analysis of the sulflde portion of rocks from a section of the Basal zone of the Stillwater Complex demonstrate that mole fractions of nickel, copper, cobalt, and sulfur in the sulfldes show trends and repeating patterns when plotted against stratigraphic position. These patterns are attributed to differentiation...
Chabazite in siliceous tuffs of a Pliocene lacustrine deposit near Durkee, Baker County, Oregon
Arthur J. 3rd Gude 3rd, Richard A. Sheppard
1978, Journal of Research of the U.S. Geological Survey (6) 467-472
A relatively pure chabazite deposit of at least 75 X 106 metric tons occurs near the Durkee type locality of erionite. This erionite is in a welded tuff interbedded with lacustrine rocks- of a closed Pliocene basin. The zeolites, chabazite, erionite, clinoptilolite, and other authigenic silicate minerals are confined to...
Fusion of granodiorite by basalt, central Sierra Nevada
F. C. W. Dodge, L. C. Calk
1978, Journal of Research of the U.S. Geological Survey (6) 459-465
A trachybasalt plug, 100 m in diameter, has partially fused inclusions and wallrock of porphyritic granodiorite near Tuolumne Meadows, Yosemite National Park, Calif. Granodiorite surrounding the plug was altered within distances of about 3.5 m. Within this distance, (1) trace amounts of glass occur along fractures and grain boundaries,...
Comendite (peralkaline rhyolite) and basalt in the Mitu Group, Peru: Evidence for Permian-Triassic lithospheric extension in the central Andes
Donald C. Noble, Miles L. Silberman, F. Megard, H. R. Bowman
1978, Journal of Research of the U.S. Geological Survey (6) 453-457
The Mitu Group consists of generally coarse clastic strata and volcanic rock of Permian and (or) Triassic age filling elongate basins that parallel the general structural trend of the Peruvian Andes. Volcanic rocks of the Mitu Group include peralkaline and nonperalkaline rhyolite and subalkaline basalt. To our knowledge, the...
Granite of Rosalie Peak, a phase of the 1700-million-year-old Mount Evans Pluton, Front Range, Colorado
Bruce Bryant, Carl E. Hedge
1978, Journal of Research of the U.S. Geological Survey (6) 447-451
The Rosalie Granite was a name applied by S. H. Ball in 1906 to a granite which forms a ridge between Mount Evans and Mount Rosalie (renamed Rosalie Peak). The type locality originally designated for the Rosalie Granite was in a pluton (later called the Rosalie lobe) 10 kilometers southeast...
Radiometric ages of some Cretaceous and Tertiary volcanic and intrusive rocks in South-central Arizona
Norman G. Banks, Roger D. Dockter, Miles L. Silberman, Charles W. Naeser
1978, Journal of Research of the U.S. Geological Survey (6) 439-445
Reconnaissance geologic mapping and radiometric ages provide the framework for correlation of Cretaceous and middle Tertiary volcanic and clastic rocks in the Vaca Hills and Eloy quadrangles, Arizona. The radiometric ages also record a middle Tertiary thermal event of much greater extent than .suggested by the volume of middle...
Potassium-argon ages of basement rocks from Saint George Island, Alaska
D.M. Hopkins, M.L. Silberman
1978, Journal of Research of the U.S. Geological Survey (6) 435-438
Potassium-argon ages from basement granitic rocks that intrude serpentinized peridotite on St. George Island, Alaska, range from 50 to 57 million years, with an initial argon isochron age. interpreted as a minimum figure, of 52 ± 2 m.y. The age of the granitic rocks and their association with serpentinized peridotite...
Giant glacial grooves at the north end of the Mission Range, Northwest Montana
I. J. Witkind
1978, Journal of Research of the U.S. Geological Survey (6) 425-433
Giant glacial grooves both cut across and wrap around the north end of the Mission Range. Some of these grooves are straight, others crescentic, but all appear to be independent of stratigraphic units and of the gross structure of the range. They were seemingly localized by preexisting stream valleys whose...
Interpreting the results of nesting studies
H.W. Miller, Douglas H. Johnson
1978, Journal of Wildlife Management (42) 471-476
Nesting studies are used to assess the production of birds and to evaluate nesting habitats. Most such studies involve finding nests in a given area and subsequently determining the proportion that hatched. Unfortunately, the results are often biased by unrecognized differences in the probabilities of finding successful and unsuccessful nests....
Red fox prey demands and implications to prairie duck production
A.B. Sargeant
1978, Journal of Wildlife Management (42) 520-527
Experiments were conducted during spring and summer with 33 red foxes (Vulpes vulpes) to determine prey demands, feeding characteristics, and growth rates using natural foods. Pups began eating prey the 4th week after birth. Then, prey consumption averaged 1.38 and 1.90 kg/pup/week for weeks 5-8 and 9-12 of the denning...
Mapped offset on the right-lateral Kern Canyon fault, southern Sierra Nevada, California
James G. Moore, Edward A. du Bray
1978, Geology (6) 205-208
The north-trending Kern Canyon fault, the longest fault within the southern Sierra Nevada, has been mapped from lat 36°00′N to its northern end near lat 36°40′N. The fault cuts and offsets granitic plutons as young as 80 m.y., but despite the fact that many recent earthquake foci plot close to...
