Geology and origin of the Death Valley uranium deposit, Seward Peninsula, Alaska
Kendell A. Dickinson, Kenneth D. Cunningham, Thomas A. Ager
1987, Economic Geology (82) 1558-1574
A uranium deposit discovered in 1977 in western Alaska, by means of airborne radiometric data, is the largest known in Alaska on the basis of industry reserve estimates. At about latitude 65 degrees N, it is the most northerly known sandstone-type uranium deposit in the world. The deposit lies in...
Source of lead and mineralizing brines for rossie-type Pb-Zn veins in the Frontenac axis area, New York ( USA).
Robert Ayuso, Nora K. Foley, C. Erwin Brown
1987, Economic Geology (82) 489-491
Veins composed mainly of calcite and some galena, sphalerite, fluorite, and other minerals are widespread in the Frontenac axis area of New York and Ontario. In New York, the veins (Fig. 1) occur mainly west and northwest of Gouverneur (Brown, 1983). The veins, mined in the 1800s for lead,...
The crustal structure of the axis of the Great Valley, California, from seismic refraction measurements
W.S. Holbrook, Walter D. Mooney
1987, Tectonophysics (140) 49-63
In 1982 the U.S. Geological Survey collected six seismic refraction profiles in the Great Valley of California: three axial profiles with a maximum shot-to-receiver offset of 160 km, and three shorter profiles perpendicular to the valley axis. This paper presents the results of two-dimensional raytracing and synthetic seismogram modeling of...
Evolution, biogeography, and systematics of Puriana: evolution and speciation in Ostracoda, III.
T. M. Cronin
1987, Journal of Paleontology (61)
Three types of geographic isolation—land barriers, deep water barriers, and climatic barriers—resulted in three distinct evolutionary responses in Neogene and Quaternary species of the epineritic ostracode genus Puriana. Through systematic, paleobiogeographic, and morphologic study of several hundred fossil and Recent populations from the eastern Pacific, western Atlantic,...
The Steens Mountain (Oregon) geomagnetic polarity transition: 3. Its regional significance
E. A. Mankinen, E.E. Larson, C. S. Grommé, M. Prevot, R. S. Coe
1987, Journal of Geophysical Research B: Solid Earth (92) 8057-8076
Study of the variations of direction and intensity of the geomagnetic field as recorded by the Miocene lava flows on Steens Mountain, southeastern Oregon, has resulted in a detailed description of total field behavior during a reversal in polarity. In addition to information about the polarity reversal itself, the detailed...
Possible Late Middle Ordovician organic carbon isotope excursion: Evidence from Ordovician oils and hydrocarbon source rocks, mid-continent and east-central United States
Joseph R. Hatch, Stephen R. Jacobson, Brian J. Witzke, J. Bruno Risatti, Donald E. Anders, W. Lynn Watney, K. David Newell, April K. Vuletich
1987, American Association of Petroleum Geologists Bulletin (71) 1342-1354
Oils generated by Middle Ordovician rocks are found throughout the Mid-Continent and east-central regions of the United States. Gas chromatographic characteristics of these oils include a relatively high abundance of n-alkanes with carbon numbers less than 20, a strong predominance of odd-numbered n-alkanes between C10 and C20, and relatively small amounts...
Modeling and analysis of direct-current electrical resistivity in the Durham Triassic basin, North Carolina
C. Erwin Brown
1987, Geoexploration (24) 429-440
Sixty-two Schlumberger electrical soundings were made in the Durham Triassic basin in an effort to determine basin structural geometry, depth of the sedimentary layers, and spatial distribution of individual rock facies. A digital computer program was used to invert the sounding curves of apparent resistivity versus distance to apparent resistivity...
Marine and nonmarine gas-bearing rocks in Upper Cretaceous Blackhawk and Neslen Formations, eastern Uinta Basin, Utah: Sedimentology, diagenesis, and source rock potential
Janet K. Pitman, Karen J. Franczyk, Donald E. Anders
1987, American Association of Petroleum Geologists Bulletin (71) 76-94
The Upper Cretaceous Blackhawk and Neslen Formations in the eastern Uinta basin contain large amounts of thermogenic gas that was generated from interbedded humic-rich source rocks. The geometry and distribution of hydrocarbon source and reservoir rocks are controlled by depositional environment. The Blackhawk, composed of laterally extensive sandstone and locally...
Trend analysis of monthly sulfur dioxide emissions in the conterminous United States, 1975-1984
H.F. Lins
1987, Atmospheric Environment (21) 2297-2309
Trends in monthly sulfur dioxide emissions for the 48 conterminous United States during the decade 1975-1984 are identified using a robust nonparametric procedure. Statistically significant downward trends are indicated in 32 States, upward trends appear in 10 States, and no significant trend is apparent in six States. Geographically, a distinct...
Character and distribution of borehole breakouts and their relationship to in situ stresses in deep Columbia River basalts
Frederick L. Paillet, K. Kim
1987, Journal of Geophysical Research Solid Earth (92) 6223-6234
The character and distribution of borehole breakouts in deeply buried basalts at the Hanford Site in south central Washington State are examined in light of stress indicator data and hydraulic-fracturing stress data by means of acoustic televiewer and acoustic waveform logging systems. A series of boreholes penetrating the Grande Ronde...
Ascaulocardium armatum (Morton 1833), new genus (Late Cretaceous): the ultimate variation on the bivalve paradigm
J. Pojeta Jr., N. F. Sohl
1987, Journal of Paleontology (61)
Cretaceous clavagellid pelecypods are a poorly known group, and have previously received little study. Ascaulocardium armatum is conchologically the most complex burrowing pelecypod known. From the study of living clavagellids, it is possible to interpret the various tubes extending outward from the adventitious crypt of A. armatum as devices...
Lower Paleozoic carbonate rocks of the Baird Mountains quadrangle, western Brooks Range, Alaska
Julie A. Dumoulin, Anita G. Harris
Irvin L. Tailleur, Paul Weimer, editor(s)
1987, Book chapter, Alaskan North Slope Geology, Volumes I and II (SEPM Book 50)
Lower Paleozoic carbonate rocks in the Baird Mountains quadrangle form a relatively thin, chiefly shallow-water succession that has been thrust-faulted and metamorphosed to blueschist and greenschist facies. Although this succession was thought to be mostly Devonian until recently, a large part of it is in fact pre-Silurian in age.Middle and...
Effect of urbanization on the water resources of eastern Chester County, Pennsylvania
R. A. Sloto
1987, Water-Resources Investigations Report 87-4098
The effects of human activity on the water resources of a 207-square-mile area of eastern Chester County was evaluated. The most serious consequence of urbanization is the contamination of ground water by volatile organic compounds, which were detected in 39 percent of the 70 wells sampled. As many as nine...
Solute geochemistry of the Snake River plain regional aquifer system, Idaho and eastern Oregon
Warren W. Wood, Walton H. Low
1987, Open-File Report 86-247
Three geochemical methods were used to determine chemical reactions that control solute concentrations in the Snake River Plain regional aquifer system: (1) Calculation of a regional solute balance within the aquifer and of mineralogy in the aquifer framework to identify solute reactions, (2) comparison of thermodynamic mineral saturation indices with...
Ground-water flow and shallow-aquifer properties in the Rio Grande inner valley south of Albuquerque, Bernalillo County, New Mexico
K. D. Peter
1987, Water-Resources Investigations Report 87-4015
The purpose of this investigation was to describe the water table configuration and its temporal variations, estimate aquifer properties, and evaluate the interaction of groundwater and surface water in the inner valley of the Rio Grande in southern Albuquerque, New Mexico, where groundwater contamination is a continuing concern. The upper...
Ground-water withdrawals and changes in ground-water levels, ground-water quality, and land-surface subsidence in the Houston district, Texas, 1980-84
James F. Williams III, C.E. Ranzau Jr.
1987, Water-Resources Investigations Report 87-4153
During 1980-84, ground-water withdrawals from the Chicot and Evangeline aquifers in the Houston district decreased from 511 million gallons per day to 444 million gallons per day. This 13-percent decrease was due to the increased availability of surface water and a decreased demand for water. The largest decreases in ground-water...
Hydrogeologic conditions and saline-water intrusion, Cape Coral, Florida, 1978-81
D. J. Fitzpatrick
1986, Water-Resources Investigations Report 85-4231
The upper limestone unit of the intermediate aquifer system, locally called the upper Hawthorn aquifer, is the principal source of freshwater for Cape Coral, Florida. The aquifer has been contaminated with saline water by downward intrusion from the surficial aquifer system and by upward intrusion from the Floridan aquifer system....
Surficial aquifer system in eastern Lee County, Florida
D. H. Boggess, F. A. Watkins
1986, Water-Resources Investigations Report 85-4161
The surficial aquifer system in eastern Lee County consists of an upper water bearing unit, which is generally unconfined, and a lower water bearing unit, which is confined and is the major source tapped by most wells. The top of the lower unit, which is of primary interest in this...
Long Valley is quiet but still bulging
R. A. Kerr
Henry Spall, editor(s)
1986, Earthquakes & Volcanoes (USGS) (18) 154-154
A history of paleoflood hydrology in the United States
John E. Costa
1986, Eos, Earth and Space Science News (67) 425-430
The origins of paleoflood hydrology in the United States can be traced back to the beginning of the 19th century, when windgaps and watergaps in the Applachians were believed to have been eroded by extraordinary floods as large lakes that were ponded behind the ridges rapidly drained. Sediment evidence for...
Hydrogeology and ground-water use and quality, Brown County, Wisconsin
J. T. Krohelski, B.A. Brown
1986, Wisconsin Geological & Natural History Survey Information Circular 57
The Paleozoic rock of Brown County includes formations of Cambrian, Ordovician, and Silurian age. These formations are eastward-dipping sedimentary rock that rest on Precambrian crystalline rock and are overlain by Pleistocene deposits. The units that are the principal sources of ground water were grouped into three aquifers (upper, St. Peter,...
Water resources of the Park City area, Utah, with emphasis on ground water
Walter F. Holmes, Kendall R. Thompson, Michael Enright
1986, Technical Publication 85
The Park City area is a rapidly growing residential and recreational area about 30 miles east of Sal t Lake City (fig. 1). The area of study is about 140 square miles in which the principle industries are agriculture, skiing, and other recreational activities. The area once was a major lead-...
Effects of brine on the chemical quality of water in parts of Creek, Lincoln, Okfuskee, Payne, Pottawatomie, and Seminole Counties, Oklahoma
Robert B. Morton
1986, Circular 89
A study of water-quality degradation due to brine contamination was made in an area of ~1,700 mi2 in east-central Oklahoma. The study area coincides in part with the outcrop of the Vamoosa-Ada aquifer of Pennsylvanian age....
Geohydrology of the Vamoosa-Ada aquifer east-central Oklahoma with a section on chemical quality of water
Joseph J. D’Lugosz, Roger G. McClaflin, Melvin V. Marcher
1986, Circular 87
The Vamoosa-Ada aquifer, which underlies an area of about 2,320 mi2, consists principally of the Vamoosa Formation and the overlying Ada Group of Pennsylvanian age. Rocks comprising the aquifer were deposited in a nearshore environment ranging from marine on the west to nonmarine on the east. Because of changes in...
Bedrock aquifers of eastern San Juan County, Utah
Charles Avery
1986, Technical Publication 86
This study is one of a series of studies appraising the waterbearing properties of the Navajo Sandstone and associated formations in southern Utah. The stu<¥ area is al:x>dy area is about 4,600 square miles, extending from the Utah-Arizona State line northward to the San Juan-Grand County line and westward from...
