Hunting behavior in two similar species of social canids
L.D. Mech
M.W. Fox, editor(s)
1975, Book chapter, The Wild Canids: Their Systematics, Behavioral Ecology, and Evolution
The costs and effects of chronic exposure to low-level pollutants in the environment
L.F. Stickel
1975, Book chapter, Hearings before the Subcommittee on the Environment and the Atmosphere, Committee on Science and Technology, U.S. House of Representatives, November 14, 1975
Birds and Marshes of the Chesapeake Bay Country
B. Meanley
1975, Book
A.B.A. Checklist: Birds of Continental United States and Canada
C.S. Robbins, W. Harrison, G.S. Keith, R.G. McCaskie, R.T. Peterson, N. Pettingell, O.S. Pettingell Jr., A. Small, R.W. Smart, J.A. Tucker
1975, Book
The purpose of this Checklist is to provide a complete up-to-date list of the bird species that have been recorded in the 49 continental United States and Canada. This list includes the native North American breeding species, the regular visitors, the accidentals from other countries that are believed to...
Avian habitat selection in a region of intensive agriculture: the red-winged blackbird
P.H. Albers
1975, Book
Linkage effects between deposit discovery and postdiscovery exploratory drilling
Lawrence J. Drew
1975, Journal of Research of the U.S. Geological Survey (3) 169-179
For the 1950-71 period of petroleum exploration in the Powder River Basin, northeastern Wyoming and southeastern Montana, three specific topics were investigated. First, the wildcat wells drilled during the ambient phases of exploration are estimated to have discovered 2.80 times as much petroleum per well as the wildcat wells drilled...
K-Ar ages of plutonic rocks in the Lassiter Coast area, Antarctica
Harald H. Mehnert, Peter D. Rowley, Dwight L. Schmidt
1975, Journal of Research of the U.S. Geological Survey (3) 233-236
Numerous middle Cretaceous stocks and small batholiths intruded Middle and Upper Jurassic sedimentary and volcanic rocks in the Lassiter Coast area of the southern Antarctic Peninsula. To establish the age of the quartz diorite and granodiorite plutonic events, five plutons were dated by the K-Ar method. The results indicate a...
Flows of impact melt at lunar crater
K. A. Howard, H. G. Wilshire
1975, Journal of Research of the U.S. Geological Survey (3) 237-251
Lavalike materials that were emplaced in a fluid state occur in and around lunar impact craters whose diameters range from 3 km to more than 200 km and whose ages span a time interval of at least 3.5 b.y. Evidence of fluid emplacement includes flow lobes and leveed channels, a...
An integrated-intensity method for emission spectrographic computer analysis
Catharine P. Thomas
1975, Journal of Research of the U.S. Geological Survey (3) 181-185
An integrated-intensity method has been devised to improve the computer analysis of data by emission spectrography. The area of the intensity profile of a spectral line is approximated by a rectangle whose height is related to the intensity difference between the peak and background of the line and whose width...
Delineation of buried glacial drift aquifers
Thomas C. Winter
1975, Journal of Research of the U.S. Geological Survey (3) 137-148
Locating and delineating buried glacial-drift aquifers poses one of the major problems to hydrogeologists working in glacial terrain. To show the vertical and horizontal boundaries of aquifers, most techniques require a multiple set of maps, a fence diagram, or a combination of maps and sections. Calculations of the first two...
Estimates of temperature and precipitation for northeastern Utah
F.K. Fields, D. B. Adams
1975, Journal of Research of the U.S. Geological Survey (3) 131-136
Estimates of temperature and precipitation were made for northeastern Utah from information that was collected at 67 locations. The variable-length records were converted to the common-time base of 1941-70; then general relations were developed to extend the converted point values to unsampled sites. Regression techniques were used to fill voids...
Comparison of fission-track, K-Ar, and Rb-Sr radiometric age determinations from some granite plutons in Maine
C. W. Naeser, D. G. Brookins
1975, Journal of Research of the U.S. Geological Survey (3) 229-231
Fission-track ages have been determined on eight apatite and four sphene concentrates separated from plutonic rocks in Maine. K-Ar and Rb-Sr ages for some of these rocks were previously published. In northeastern Maine the whole-rock Rb-Sr, biotite K-Ar, and apatite fission-track ages are concordant at 400-420 million years, whereas in...
Information through color imagery
Alden P. Colvocoresses
1975, Journal of Research of the U.S. Geological Survey (3) 127-129
The color-sensing capability of the human eye is a powerful tool. In remote sensing we should use color to display data more meaningfully, not to re-create the scene. Color disappears with distance, and features change color with viewing angle. Color infrared film lets us apply color with additional meaning even...
Preliminary results of a gravity survey of the Henrys Lake quadrangle, Idaho and Montana
Donald L. Peterson, Irving J. Witkind
1975, Journal of Research of the U.S. Geological Survey (3) 228
A gravity survey of the Henrys Lake quadrangle shows that a gravity low with about 10 milligals of closure coincides with the Henrys Lake basin. The low is interpreted to reflect a basin fill of 1,100 m or more of Cenozoic sediments and volcanic rock. The data indicate that on...
Analysis for tellurium in rocks to 5 parts per billion
John R. Watterson, George J. Neuerburg
1975, Journal of Research of the U.S. Geological Survey (3) 191-195
In the proposed method, a 12.5-g sample is digested with nitric acid and evaporated to dryness; the excess nitric acid is removed by reaction with formic acid. Tellurium is extracted from the dried residue into hydrobromic acid and is then coprecipitated with arsenic, using hypophosphorous acid as the reducing agent....
Perched silica minerals on mordenite fiber
Robert B. Finkelman
1975, Journal of Research of the U.S. Geological Survey (3) 197-202
Ellipsoidal quartz grains and spherulitic chalcedony are perched on mordenite fibers in geodes from Chihuahua, Mexico. Examination of samples of fibrous mordenite from six additional localities indicated that most mordenites have perched quartz crystals. A linear relationship exists between the Si:Al ratios and the refractive indices of the mordenites. The...
Cylindrical jointing in mafic dikes, central Beartooth Mountains, Montana
Theodore J. Armbrustmacher, Frank S. Simons
1975, Journal of Research of the U.S. Geological Survey (3) 213-221
Cylindrical joints are well displayed in two Precambrian mafic dikes that cut granitic gneiss in the central Beartooth Mountains, Mont. The dikes are vertical and about 23 m (75 ft) and 23 to 46 m (75-150 ft) thick, respectively. The cylindrical joints are perpendicular to the dike walls, and the...
Experimental abrasion of detrital gold
Warren E. Yeend
1975, Journal of Research of the U.S. Geological Survey (3) 203-212
The physical breakdown and abrasion rates of gold were studied using a tumbler to simulate natural high-energy environments. The gold fragments were tumbled for periods ranging from 30 to 240 h with different combinations of sand, cobbles, and water at velocities of 0.5 and 2.0 mi/h (0.85 and 3.22 km/h)....
Relative efficiencies of square and triangular grids in the search for elliptically shaped resource target
Donald A. Singer
1975, Journal of Research of the U.S. Geological Survey (3) 163-167
The relative efficiencies of equivalent-density, square and equilateral triangular (hexagonal) grids used in the search for elliptical targets are determined for ellipses having relative semi-major axes ranging from 0.50 to 1.00 of the square grid spacing and having shapes (minor axes/major axes) ranging from 0.2 to 1.0. Using the probability...
Spectrophotometric-isotope dilution determination of arsenic in soils and rock
F. W. Brown, F.O. Simon, L. P. Greenland
1975, Journal of Research of the U.S. Geological Survey (3) 187-190
Arsenic in soil and rock samples may be determined in part-per-million concentrations using a radiochemical-isotope dilution method. Arsenic in the sample plus added As76 tracer is separated as arsine and determined spectrophotometrically as a molybdenum blue complex. The As76 activity in the absorbing solution allows corrections for chemical losses. A lower limit...
Ice ages and the thermal equilibrium of the earth, II
D.P. Adam
1975, Quaternary Research (5) 161-171
The energy required to sustain midlatitude continental glaciations comes from solar radiation absorbed by the oceans. It is made available through changes in relative amounts of energy lost from the sea surface as net outgoing infrared radiation, sensible heat loss, and latent heat...
Elevation changes in the central Transverse Ranges near Ventura, California
Jane M. Buchanan-Banks, Robert O. Castle, Joseph I. Ziony
1975, Tectonophysics (29) 113-125
Profiles of elevation changes developed from repeated levelings in the east-trending Transverse Ranges near Ventura, California, reveal three general types of vertical movements: 1. (1) broadly defined regional tilting; 2. (2) sharply defined differential movements across recently active faults; and 3. (3) differential subsidence centering on producing oil fields. Down-to-the-southeast...
The Pikes Peak batholith, Colorado front range, and a model for the origin of the gabbro-anorthosite-syenite-potassic granite suite
F. Barker, D. R. Wones, W. N. Sharp, G. A. Desborough
1975, Precambrian Research (2) 99-160
This study of the Pikes Peak batholith includes the mineralogy and petrology of quartz syenite at West Creek and of fayalite-bearing and fayalite-free biotite granite near Mount Rosa; major element chemistry of the batholith; comparisons with similar postorogenic, intracratonic, sodic to potassic intrusives; and genesis of the batholith.The batholith is...
Thermal-infrared spectra and chemical analyses of twenty-six igneous rock samples
R.K. Vincent, L. C. Rowan, R.E. Gillespie, C. Knapp
1975, Remote Sensing of Environment (4) 199-209
Emittance spectra in the 7.5 μm to 14 μm wavelength region and chemical compositions of 26 igneous rocks are reported. Experimental measurements on the rocks were made under simulated daytime field conditions. Some surface silicate contaminants, such as clayey silt, significantly...
Al-augite and Cr-diopside ultramafic xenoliths in basaltic rocks from western United States
H. G. Wilshire, J.W. Shervais
1975, Physics and Chemistry of the Earth (9) 257-272
Ultramafic xenoliths in basalts from the western United States are divided into Al-augite and Cr-diopside groups. The Al-augite group is characterized by Al, Ti-rich augites, comparatively Fe-rich olivine and orthopyroxene, and Al-rich spinel, the Cr-diopside group by Cr-rich clinopyroxene and spinel and...
