Conference Papers
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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse almost 5,000 conference papers authored by our scientists and refine search by topic, location, year, and advanced search.
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AQUATIC PHOTOLYSIS OF OXY-ORGANIC COMPOUNDS ADSORBED ON GOETHITE.
Organic materials that will not absorb light at wavelengths longer than 295 nanometers (the solar wavelength cutoff) may nevertheless, undergo electron transfer reactions initiated by light. These reactions occur when the organic materials are adsorbed as ligand complexes to the surface of iron oxy-hydroxide (goethite). The adsorbed materials can be either inner or outer coordination sphere comple
Authors
Marvin C. Goldberg
ART AND SCIENCE OF IMAGE MAPS.
The visual image of reflected light is influenced by the complex interplay of human color discrimination, spatial relationships, surface texture, and the spectral purity of light, dyes, and pigments. Scientific theories of image processing may not always achieve acceptable results as the variety of factors, some psychological, are in part, unpredictable. Tonal relationships that affect digital ima
Authors
Richard D. Kidwell, Joseph A. McSweeney
Benthic foraminifera as indicators of potential petroleum sources
No abstract available.
Authors
C. Wylie Poag
BORATE DEPOSITS IN THE UNITED STATES: DISSIMILAR IN FORM, SIMILAR IN GEOLOGIC SETTING.
Borate deposits in the western United States have several geologic characteristics in common: All primary deposits are about 20 my or less in age, and they are observed or inferred to be stratigraphically associated with volcanic activity and thermal springs. Most of them lie at least partially in the lacustrine facies of their host formations which implies the existence of closed basins created b
Authors
George I. Smith
Breeding guidelines for abating inadvertent genetic change in trout hatchery brood stocks
No abstract available at this time
Authors
S.R. Phelps, W. B. Schill, R.C. Simon
CHEMISTRY OF LOW-TEMPERATURE GEOTHERMAL WATERS AT KLAMATH FALLS, OREGON.
Chemical and isotopic analyses of well discharges indicate that in the aquifer mixing occurs between shallow cold groundwater containing 2. 0 TU tritium and a deeper tritium-free thermal groundwaer at 100 to 120 degree C. This deeper water apparently results from the mixing of old, tritium-free cold groundwater and deep thermal groundwater at about 190 degree C and 120 mg/kg Cl. The temperature an
Authors
C. J. Janik, A.H. Truesdell, E.A. Sammel, A. F. White
CLAY MINERALOGY OF INSOLUBLE RESIDUES IN MARINE EVAPORITES.
Insoluble residues from three sequences of Paleozoic marine evaporites (Retsof salt bed in western New York, Salado Formation in south-eastern New Mexico, and Paradox Member of the Hermosa Formation in southeastern Utah) are rich in trioctahedral clays. Chlorite (clinochlore), corrensite (mixed-layer chlorite-trioctahedral smectite), talc, and illite (the only dioctahedral clay) are the dominant c
Authors
Marc W. Bodine
COMPARISON OF RECORDING CURRENT METERS USED FOR MEASURING VELOCITIES IN SHALLOW WATERS OF SAN FRANCISCO BAY, CALIFORNIA.
The authors determine the feasibility of collecting reliable current-meter data in shallow water under natural conditions. The study involved field testing four types of recording current meters (different speed sensors) and comparing data recorded by the meters under different field conditions. Speeds recorded by the current meters at slack water and during maximum flows were compared during calm
Authors
Jeffrey W. Gartner, Richard N. Oltmann
COMPUTER METHOD TO DETECT AND CORRECT CYCLE SKIPPING ON SONIC LOGS.
A simple but effective computer method has been developed to detect cycle skipping on sonic logs and to replace cycle skips with estimates of correct traveltimes. The method can be used to correct observed traveltime pairs from the transmitter to both receivers. The basis of the method is the linearity of a plot of theoretical traveltime from the transmitter to the first receiver versus theoretica
Authors
Douglas C. Muller
CONCEPTUAL FRAMEWORK FOR REGRESSION MODELING OF GROUND-WATER FLOW.
The author examines the uses of ground-water flow models and which classes of use require treatment of stochastic components. He then compares traditional and stochastic procedures for modeling actual (as distinguished from hypothetical) systems. Finally, he examines the conceptual basis and characteristics of the regression approach to modeling ground-water flow.
Authors
Richard L. Cooley
CONMAP - USGS MARINE MAPPING PROGRAM.
The U. S. Geological Survey has commenced a marine mapping program, CONMAP (the Continental Margin Maps), which is supported by, and dependent on, a foundation of digital data-bases. The goal of the program's first phase is to prepare a series of maps that completely cover the Exclusive Economic Zone. The maps will be prepared using an Albers' Conic Equal-Area Projection at a scale of 1:1,000,000.
Authors
Edward C. Escowitz
CROSS-SHORE TRANSPORT OF BIMODAL SANDS.
Foreshore sediment level and sediment size were monitored as part of an extensive nearshore processes experiment - DUCK 82. Changes in foreshore texture were compared with computed values of onshore transported material based on current measurements from the surf zone and sediment transport theory. Preliminary results indicate reasonable agreement between predicted size of sediment transported ons
Authors
Bruce M. Richmond, Asbury H. Sallenger,