The influence of late Cenozoic stratigraphy on distribution of impoundment-related seismicity at Lake Mead, Nevada-Arizona
R. Ernest Anderson, R. L. Laney
1975, Journal of Research of the U.S. Geological Survey (3) 337-343
At Lake Mead, contrasts in permeability of upper Cenozoic sediments show a better correlation with irregularly distributed impoundment-related seismicity than do contrasts in structure. An evaluation of structures developed during the late Cenozoic fails to explain the erratic distribution of seismicity. An evaluation of the late Cenozoic stratigraphy, however, shows...
Widespread late glacial and postglacial tephra deposits from Mount St. Helens Volcano, Washington
Donal R. Mullineaux, Jack H. Hyde, Meyer Rubin
1975, Journal of Research of the U.S. Geological Survey (3) 329-335
Pumice layers composing four different groups of tephra beds (termed "sets"), whose stratigraphy, age, and trend away from Mount St. Helens are fairly well known, are potentially valuable stratigraphic markers in the northwestern United States and adjacent parts of Canada. All four tephra sets are less than about 18,000 yr...
Geology, geochemistry, and fluid-inclusion petrography of the Sapo Alegre porphyry copper prospect and its metavolcanic wallrocks, west-central Puerto Rico
Dennis P. Cox, Ileana Perez Gonzalez, J. Thomas Nash
1975, Journal of Research of the U.S. Geological Survey (3) 313-327
The Sapo Alegre prospect, a small porphyry copper-molybdenum occurrence in west-central Puerto Rico, is characterized by distinct zones of alteration and mineralization of quartz diorite porphyry. A biotite-chlorite zone in the porphyry near its contact with surrounding metavolcanic rocks contains copper, molybdenum, gold, silver, selenium, and tellurium. A quartz-sericite-pyrite zone...
Applications of remote sensing to structural interpretations in the southern Appalachians
J. E. Johnston, R. L. Miller, K. J. Englund
1975, Journal of Research of the U.S. Geological Survey (3) 285-293
Remote sensing is the technology of studying distant objects by measuring and recording energy from one or more segments of the electromagnetic spectrum. Imaging sensors which operate from medium- and high-altitude aircraft or from spacecraft can provide a synoptic view of large areas and of surface phenomena not evident in...
An occurrence of disseminated uraninite in Wheeler Basin, Grand County, Colorado
E. J. Young, P. L. Hauff
1975, Journal of Research of the U.S. Geological Survey (3) 305-311
Disseminated uraninite occurs in Wheeler Basin, Grand County, Colo., about 5 mi (8 km) southeast of Monarch Lake, in Precambrian metamorphic rocks consisting of migmatized gneiss and mixed gneiss and pegmatite. An intrusion of Precambrian Y Silver Plume Granite lies within 400 ft (122 m) of the occurrence. The...
The study of fresh-water lake ice using multiplexed imaging radar
Bryan M. Leonard, R.W. Larson
1975, Journal of Glaciology (14) 445-457
The study of ice in the upper Great Lakes, both from the operational and the scientific points of view, is receiving continued attention. Quantitative and qualitative field work is being conducted to provide the needed background for accurate interpretation of remotely sensed data. The data under discussion in this paper...
Fluid inclusion studies of vein, pipe, and replacement deposits, northwestern San Juan Mountains, Colorado
J. Thomas Nash
1975, Economic Geology (70) 1448-1462
Base and precious metal ores valued in excess of $300 million have been mined from vein, pipe, and replacement deposits located on the northwest side of, and structurally related to, the middle Tertiary Silverton caldera. A belt of normal faults radial to the caldera contains veins which have been mined...
Geochemical studies in the Park City district; II, Sulfide mineralogy and minor-element chemistry, Mayflower mine
J. Thomas Nash
1975, Economic Geology (70) 1038-1049
Fissure-filling and replacement Pb-Zn-Cu-Au-Ag ores of the Mayflower mine occur in calcareous sedimentary and intrusive wall rocks over a vertical interval of 3,000 feet. The ores are exceptional in the district for their chalcopyrite and gold content and for the unusual associated gangue minerals anhydrite, chlorite, and hematite. High oxygen...
Index of flood maps for California prepared by the U.S. Geological Survey through 1974
John R. Crippen
1975, Open-File Report 1002-37
No abstract available....
Sources of suspended matter in waters of the Middle Atlantic Bight
Robert H. Meade, Peter L. Sachs, Frank T. Manheim, J.C. Hathaway, Derek Spencer
1975, Journal of Sedimentary Research (78) 171-188
Suspended matter collected in the Middle Atlantic Bight (the coastal segment of the United States between Cape Cod and Cape Hatteras) in September 1969 was predominantly organic: an average of 80% combustible organic matter in surface waters and 40)% near bottom. Total suspended concentrations decreased between the inner shelf and...
Cholinesterase (ChE) response and related mortality among birds fed ChE inhibitors
J. Larry Ludke, Elwood F. Hill, Michael P. Dieter
1975, Archives of Environmental Contamination and Toxicology (3) 1-21
Patterns of mortality and inhibition of brain and plasma ChE in birds treated with ChE inhibitors were studied in an attempt to determine the validity of using ChE activity as a monitoring and diagnostic technique. Analysis of brain ChE activity proved to be reliable for diagnosing and monitoring effects of...
Bishop ash: A widespread volcanic ash extended to southern California
Richard Merriam, James L. Bischoff
1975, Journal of Sedimentary Research (45) 207-211
No abstract available....
Geologic setting and chemical characteristics of hot springs in west-central Alaska
Thomas Miller, Ivan Barnes, William Wallace Patton Jr.
1975, Journal of Research of the U.S. Geological Survey (3) 149-162
Numerous hot springs occur in a variety of geologic provinces in west-central Alaska. Granitic plutons are common to all the provinces, and the hot springs are spatially associated with the contacts of these plutons. Of 23 hot springs whose bedrock geology is known, all are within 4.8 km (3 mi)...
Monitoring regional effects of high pressure injection of wastewater in a limestone aquifer
Glen L. Faulkner, Charles A. Pascale
1975, Groundwater (13) 197-208
More than 10 billion gallons (38 × 106 m3) of acid industrial liquid waste has been injected in about 11 years under high pressure into a saline-water-filled part of a limestone aquifer of low transmissivity between 1,400 and 1,700 feet (430 and 520 m) below land surface near Pensacola, Florida....
Pyrrolidone - a new solvent for the methylation of humic acid
R.L. Wershaw, D.J. Pinckney, S.E. Booker
1975, Journal of Research of the U.S. Geological Survey (3) 123-126
In the past, humic acid has been methylated by suspending it in a solution of diazomethane in diethyl ether, and degrading the partly methylated humic acid to release those parts of the molecule that were methylated. Only small fragments of the molecule have been identified by this technique. In the...
Weights, growth, and survival of timber wolf pups in Minnesota
V. Van Ballenberghe, L.D. Mech
1975, Journal of Mammalogy (56) 44-63
Weights, growth rates, canine tooth lengths, and survival data were obtained from 73 wild wolf (Canis lupus) pups that were 8 to 28 weeks old when live-trapped in three areas of northern Minnesota from 1969 to 1972. Relative weights of wild pups are expressed as percentages of a standard weight...
Blood analyses of wolf pups and their ecological and metabolic interpretation
U.S. Seal, L.D. Mech, V. Van Ballenberghe
1975, Journal of Mammalogy (56) 64-75
Blood samples were obtained from 32 wolf (Canis lupus) pups live-trapped over a three-year period in northern Minnesota. The results of 21 laboratory analyses of hematology and blood chemistry are tabulated and analyzed in terms of study area, age, sex, and year of collection. Mean values are compared to those...
The distribution of seepage within lakebeds
M.S. McBride, H.O. Pfannkuch
1975, Journal of Research of the U.S. Geological Survey (3) 505-512
The mutual exchange of water between lakes and contiguous permeable ground-water bodies, which are thin relative to the diameter of the lakes, was modeled digitally. A significant rate of seepage was found to extend only a relatively short distance from shore, thus forming a narrow band around the lake's perimeter....
Regional impact of water resource investments in an developing area
E. D. Attanasi
1975, Journal of the American Water Resources Association (11) 69-76
Regional development and industrialization patterns are investigated and related via regression analysis to water resource investments for the island of Puerto Rico. Although results of this study indicate such investments have little immediate or short‐term impact, significant relationships and variations in regional responses appear over longer time periods. This is...
Geology of Bulgaria: A review
Richard M. Foose, Frank T. Manheim
1975, AAPG Bulletin (59) 303-335
Bulgaria is in southeastern Europe between reasonably well-described areas of predominantly Alpine crustal deformation on the north and northwest (Carpathians in Romania, Hungary, and Czechoslovakia; Alps in Austria), on the east (Pontides and Taurides in Turkey), and on the west and south (Dinaric Alps in Yugoslavia; Pindos Mountains...
Mechanism of Formation of Pillow Lava
James G. Moore
1975, American Scientist (63) 269-277
Much of the ocean floor is covered by lava of a distinctive character. The lava appears to be made up of closely packed ellipsoidal masses about the size and shape of pillows - hence the term pillow lava. Only within the last few years has the abundance of pillow lava...
A brief history of the U.S. Geological Survey
Water Resources Division, U.S. Geological Survey, Mary C. Rabbitt
1975, Report
Established by an Act of Congress in 1879 and charged with responsibility for "classification of the public lands, and examination of the geological structure, mineral resources, and products of the national domain," the U. S. Department of the Interior's Geological Survey has been the Nation's principal source of information about...
Effects of lowering interior canal stages on salt-water intrusion into the shallow aquifer in southeast Palm Beach County, Florida
Larry F. Land
1975, Open-File Report 75-74
Land in southeast Palm Beach County is undergoing a large-scale change in use, from agricultural to residential. To accommodate residential use, a proposal has been made by developers to the Board of the Lake Worth Drainage District to lower the canal stages in the interior part of the area undergoing...
A reconnaissance of hydrogeologic conditions in Lehigh Acres and adjacent areas of Lee County, Florida
Durward Hoye Boggess, T.M. Missimer
1975, Open-File Report 75-55
Lehigh Acres, a residential community with a population of about 13,500 and comprising an area of about 94 square miles (243 square kilometres) in the eastern part of Lee County, has been under development since 1954. Prior to development the area was poorly drained. By 1974, more than 150 miles...
Geohydrology and water quality of the Mississippi River alluvial aquifer, northeastern Louisiana
Merrick S. Whitfield Jr.
1975, Water Resources Technical Report 10
The Mississippi River alluvial aquifer in northeastern Louisiana is in the alluvium of the Mississippi, Arkansas, and Ouachita Rivers and underlies approximately 5,000 square miles (13,000 square kilometers) in the Mississippi River valley. The aquifer, of Pleistocene age, is a southeastward-thickening wedge of sand and gravel that ranges in thickness...
