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,...
The aeromagnetic expression of bedrock geology between the Clinton-Newbury and Bloody Bluff fault zones, northeastern Massachusetts
Donald C. Alvord, Kenneth G. Bell, Maurice H. Pease Jr., Patrick J. Barosh
1976, Journal of Research of the U.S. Geological Survey (4) 601-604
The pattern of mapped bedrock geology in northeastern Massachusetts bears a striking similarity to patterns of aeromagnetic anomalies in the area. The correspondence of the geology with the anomaly pattern and lineaments on aeromagnetic maps is especially well shown northwest of Boston between the Clinton-Newbury and Bloody Bluff fault zones....
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...
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...
Gamma-ray spectrometer measurement of 238U/235U in uranium ore from a natural reactor at Oklo, Gabon
Robert M. Moxham
1976, Journal of Research of the U.S. Geological Survey (4) 589-592
About 20 years ago, Kuroda theorized that a high-grade uranium deposit emplaced about 2x109 years ago could achieve criticality and sustain a nuclear chain reaction, given a sufficient thickness of high-grade ore and an appropriate water content. Such a natural reactor was found in 1972 at the Oklo deposit, Gabon....
Field verification of method for distributing flow through multiple-bridge openings
Fred N. Lee
1976, Journal of Research of the U.S. Geological Survey (4) 539-543
Field data collected at three sites in Louisiana having multiple-bridge openings were used to check a method of distribution of flow through two or more bridges. Actual peak discharges in the various main and overflow bridges ranged from 878 to 11,055 cubic feet per second (24.9 to 313 m2/s). The...
Sedimentary depositional environments of uranium and petroleum host rocks of the Jackson Group, south Texas
Kendell A. Dickinson
1976, Journal of Research of the U.S. Geological Survey (4) 615-629
Determination of depositional environments in rocks of the Jackson Group of late Eocene age aids in the exploration for uranium and petroleum in south Texas. During deposition of the Jackson Group, conditions were similar to those existing along the modern Gulf Coast of Texas except for a less arid climate...
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...
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...
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...
Status of projects in Minnesota, fiscal years 1976 and 1977
U.S. Geological Survey
1976, Report
No abstract available....
Hydrologic unit map-1974, State of Minnesota
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...
Monitoring arctic habitat and goose production by satellite imagery
H.M. Reeves, F.G. Cooch, R. E. Munro
1976, Journal of Wildlife Management (40) 532-541
Spacecraft imagery, especially from the National Atmospheric and Oceanic Administration's Improved TIROS (Television Infra-Red Observational Satellite) Operational Satellites, permits timely evaluations of snow and ice conditions encountered by arctic nesting geese. Imagery from the TIROS satellite for 5 wide]y scattered locations in arctic North America was obtained for three...
Revision of Mississippian stratigraphy, eastern Idaho and northeastern Utah
William Jasper Sando, J. Thomas Dutro Jr., Charles Sandberg, Bernard L. Mamet
1976, Journal of Research of the U.S. Geological Survey (4) 467-479
New paleontologic evidence requires a revision of previous interpretations of the stratigraphy of Mississippian sequences in the Cordilleran miogeosyncline of eastern Idaho and northeastern Utah. A postulated unconformity between rocks of early Osagean age and rocks of middle Meramecian age is no longer tenable in the light of new data....
