Brown, yellow, orange, and greenish-black thorites from the Seerie pegmatite, Colorado
Mortimer H. Staatz, John W. Adams, James S. Wahlberg
1976, Journal of Research of the U.S. Geological Survey (4) 575-582
Four types of thorite - brown, yellow, orange, and greenish-black - occur together in narrow fracture fillings rich in brown fluorite near the outer edge of the Seerie pegmatite. The brown thorite is by far the most abundant. The thorites are remarkably similar in composition except for their Fe2O3 and...
Bulk chemical analyses of petrographic thin sections of rocks of the Samli area, western Turkey
James R. Lindsay, Gerhard W. Leo
1976, Journal of Research of the U.S. Geological Survey (4) 569-574
Petrographic thin sections have been analyzed for their major-element composition using a fusion-dilution technique and measuring the intensity of X-rays by means of the electron microprobe. The balsam-mounted thin sections were removed from the glass slides by soaking them in methylene chloride. The freed sections were mixed with twice their...
Prehnite in plutonic and metamorphic rocks of the northern Santa Lucia Range, Salinian block, California
Donald C. Ross
1976, Journal of Research of the U.S. Geological Survey (4) 561-568
Prehnite is abundant as monomineralic veins, as lenses in biotite, and as discrete patches and apparent primary crystals in both plutonic and metamorphic rocks along the west edge of the Salinian block in the northern Santa Lucia Range. The prehnite appears to be concentrated near the Sur fault zone but...
Volcanic rocks of the eastern and northern parts of the San Francisco volcanic field, Arizona
Richard B. Moore, Edward W. Wolfe, George E. Ulrich
1976, Journal of Research of the U.S. Geological Survey (4) 549-560
The eastern and northern parts of the San Francisco volcanic field, between San Francisco Mountain and the Little Colorado River, contain about 175 cinder cones, many with one or more associated lava flows, and one center of silicic volcanism, O'Leary Peak. Basaltic flows and cones are divided into five groups,...
Confidence limits for flood-frequency curves computed from samples from Pearson type III populations
Clayton H. Hardison
1976, Journal of Research of the U.S. Geological Survey (4) 545-547
A study of T-year events computed from samples drawn from Pearson type III populations of known skew indicates that for skew coefficients between -1.0 and 1.0, confidence limits can be derived from the confidence limits computed for frequency curves based on samples from normal distributions. For samples from populations with...
An infiltration index useful in estimating low-flow characteristics of drainage basin
Jeffrey T. Armbruster
1976, Journal of Research of the U.S. Geological Survey (4) 533-538
Regionalization of low flows using basin characteristics has not produced satisfactory results because the effect of geology has not been included. In the Susquehanna River basin, ground-water discharge from the regolith is the primary source of low flows. This paper describes the development of an infiltration index, which, by characterizing...
Improving estimates of streamflow characteristics by using Landsat-1 imagery
Este F. Hollyday
1976, Journal of Research of the U.S. Geological Survey (4) 517-531
Imagery from the first Earth Resources Technology Satellite (renamed Landsat-1) was used to discriminate physical features of drainage basins in an effort to improve equations used to estimate streamflow characteristics at gaged and ungaged sites. Records of 20 gaged basins in the Delmarva Peninsula of Maryland, Delaware, and Virginia were...
Fresh ground water found deep beneath Nantucket Island, Masachusetts
F. A. Kohout, E.H. Walker, Michael H. Bothner, J.C. Hathaway
1976, Journal of Research of the U.S. Geological Survey (4) 511-515
In a deep water-resources and stratigraphic test well near the center of Nantucket Island, about 30 miles (48 kilometres) off the New England coast, freshwater has been found at greater depths than predicted by the Ghyben-Herzberg principle. An uppermost lens of freshwater, which occupies relatively permeable glacial-outwash sand and gravel...
Pre-Eocene rocks of Java, Indonesia
Keith B. Ketner, Kastowo, Subroto Modjo, C. W. Naeser, J. D. Obradovich, Keith Robinson, Tatan Suptandar, Wikarno
1976, Journal of Research of the U.S. Geological Survey (4) 605-614
The exposed pre-Eocene rocks of Java can be divided into two compound units for purposes of reconnaissance mapping and structural interpretation: a sedimentary sequence and melange. The sedimentary sequence consists of moderately deformed and little-metamorphosed conglomerate, sandstone, mudstone, claystone, chert, and limestone. The melange consists of a chaotic mechanical mixture...
Compositional variations in wolframite from the Hamme (Tungsten Queen) mine, North Carolina
M. L. Bird, J. E. Gair
1976, Journal of Research of the U.S. Geological Survey (4) 583-588
A microprobe study of wolframite from the Tungsten Queen mine, Hamme district, North Carolina, proves it to be almost pure huebnerite. Concentric zoning, which shows up as light-brown and dark-brown bands, indicates small variations in the content of FeO. There is no apparent correlation between the small variations in the...
Determining population size of territorial red-winged blackbirds
P.H. Albers
1976, Journal of Wildlife Management (40) 761-768
Population sizes of territorial male red-winged blackbirds (Agelaius phoeniceus) were determined with counts of territorial males (area count) and a Petersen-Lincoln Index method for roadsides (roadside estimate). Weather conditions and time of day did not influence either method. Combined roadside estimates had smaller error bounds than the individual transect estimates...
Search for the Viking 2 landing site
H. Masursky, N.L. Crabill
1976, Science (194) 62-68
The search for the landing site of Viking 2 was more extensive than the search for the Viking 1 site. Seven times as much area (4.5 million square kilometers) was examined as for Viking 1. Cydonia (B1) and Capri (C1) sites were examined with the Viking 1...
Fine particles on Mars: Observations with the Viking 1 lander cameras
T.A. Mutch, R. E. Arvidson, A.B. Binder, F.O. Huck, E.C. Levinthal, S. Liebes Jr., E. C. Morris, D. Nummedal, James B. Pollack, C. Sagan
1976, Science (194) 87-91
Drifts of fine-grained sediment are present in the vicinity of the Viking 1 lander. Many drifts occur in the lees of large boulders. Morphologic analysis indicates that the last dynamic event was one of general deflation for at least some drifts. Particle cohesion implies that there is a distinct small-particle...
Dinoflagellates: Fossil motile-stage tests from the Upper Cretaceous of the northern New Jersey coastal plain
F.E. May
1976, Science (193) 1128-1130
Fossil dinoflagellate tests have been considered to represent encysted, nonmotile stages. The discovery of flagellar porelike structures and probable trichocyst pores in the Upper Cretaceous genus Dinogymnium suggests that motile stage tests are also preserved as acid-resistant, organic-walled microfossils....
Bicarbonate content of groundwater in carbonate rock in eastern North America
F.W. Trainer, R.C. Heath
1976, Journal of Hydrology (31) 37-55
In carbonate-rock terrane the most effective solution occurs where soil and vegetative cover facilitate biogenic production and storage of CO2 in the soil until part of it is carried downward in percolating water. Bicarbonate data for groundwater in eastern North America are examined in the light of these conditions, of...
Preliminary results from the Viking orbiter imaging experiment
M. H. Carr, H. Masursky, W.A. Baum, K.R. Blasius, G.A. Briggs, J.A. Cutts, T. Duxbury, R. Greeley, J. E. Guest, B.A. Smith, L.A. Soderblom, J. Veverka, J.B. Wellman
1976, Science (193) 766-776
During its first 30 orbits around Mars, the Viking orbiter took approximately 1000 photographic frames of the surface of Mars with resolutions that ranged from 100 meters to a little more than 1 kilometer. Most were of potential landing sites in Chryse Planitia and Cydonia and near Capri Chasma. Contiguous...
The Viking landing sites: Selection and certification
H. Masursky, N.L. Crabill
1976, Science (193) 809-812
During the past several years the Viking project developed plans to use Viking orbiter instruments and Earth-based radar to certify the suitability of the landing sites selected as the safest and most scientifically rewarding using Mariner 9 data. During June and July 1976, the Earth-based radar and...
Radar characteristics of Viking 1 landing sites
G.L. Tyler, D.B. Campbell, G.S. Downs, R.R. Green, H. J. Moore
1976, Science (193) 812-815
Radar observations of Mars at centimeter wavelengths in May, June, and July 1976 provided estimates of surface roughness and reflectivity in three potential landing areas for Viking 1. Surface roughness is characterized by the distribution of surface landing slopes or tilts on lateral scales of the order...
Hydrologic unit map-1974, State of Minnesota
U.S. Geological Survey
1976, Report
No abstract available....
Status of projects in Minnesota, fiscal years 1976 and 1977
U.S. Geological Survey
1976, Report
No abstract available....
Relocation of local earthquakes by seismic ray tracing
E.R. Engdahl, W.H.K. Lee
1976, Journal of Geophysical Research (81) 4400-4406
Seismic ray tracing is used to relocate a set of local earthquakes recorded by a dense seismic array in Bear Valley, California. The crustal velocity structure is two-dimensional and incorporates most of the known and inferred velocity differences in the region. Relocated hypocenters fall within the San Andreas fault zone,...
Determination of three‐dimensional velocity anomalies under a seismic array using first P arrival times from local earthquakes: 1. A homogeneous initial model
Keiiti Aki, W.H.K. Lee
1976, Journal of Geophysical Research (81) 4381-4399
Geiger's method of locating local earthquakes has been extended to include the effect of P velocity variation along the ray paths in three dimensions. The crustal structure was modeled by rectangular blocks, and a parameter was assigned to each block describing the perturbation of P wave slowness...
Home range, social behavior, and dominance relationships in the African unstriped ground squirrel, Xerus rutilus
Thomas J. O'Shea
1976, Journal of Mammalogy (57) 450-460
A field study of home range, social behavior, and dominance relationships in the African unstriped ground squirrel, Xerus rutilus, was conducted in semi-arid bushland near Kibwezi, Kenya. Ground squirrels lived alone or in small groups in isolated burrow systems and had broadly overlapping home ranges. They were neither...
Field measurements of apparent Curie temperatures in a cooling basaltic lava lake, Kilauea Iki, Hawaii
Charles J. Zablocki, Robert I. Tilling
1976, Geophysical Research Letters (3) 487-490
Magnetic susceptibility and temperature measurements have been made in two of three holes drilled in 1975 through the crust and into the still molten lens of tholeiitic basalt in Kilauea Iki lava lake (formed in 1959). The temperature above which magnetic susceptibility drops to zero—the apparent Curie temperature—is 540°C. at depths of...
Evidence of post-Pleistocene faults on New Jersey Atlantic outer continental shelf
R. E. Sheridan, H.J. Knebel
1976, American Association of Petroleum Geologists Bulletin (60) 1112-1117
Recently obtained high-resolution seismic profiles (400-4,000-Hz band) show evidence of faults in shallow sedimentary strata near the edge of the Atlantic continental shelf off New Jersey. Apparent normal faults having a throw of about 1.5 m displace sediments to within 7 m of the sea floor. The faults appear to...
