Abstracts of the 11th Annual U.S. Geological Survey, Central Region, 1999 Poster Review; Collected Abstracts of Selected Poster Papers Presented at Scientific Meetings
1999, Open-File Report 99-321
In 1999, the U.S. Geological Survey Central Region had a poster review where USGS scientists showcased posters that had been presented at scientific meetings. This report contains abstracts for selected posters that were presented at this review. Science topics were from several USGS teams with a broad range of topics....
Hydrology of the coastal lowlands aquifer system in parts of Alabama, Florida, Louisiana, and Mississippi
Angel Martin Jr., C. D. Whiteman Jr.
1999, Professional Paper 1416-H
Existing data on water levels, water use, water quality, and aquifer properties were used to construct a multilayer digital model to simulate flow in the aquifer system. The report describes the geohydrologic framework of the aquifer system, and the development, calibration, and sensitivity analysis of the ground-water-flow model, but it...
Neogene-quaternary Ostracoda and paleoenvironments, of the Limón basin, Costa Rica, and Bocas del Toro basin, Panama
P.F. Borne, T. M. Cronin, J. E. Hazel
1999, Bulletins of American Paleontology 231-250
Tropical marine ostracodes from Neogene and Quaternary sediments of the Central American Caribbean region have been the subject of biostratigraphic, ecological, taxonomic, and evolutionary studies. As part of the Panama Paleontology Project (PPP), Neogene and Quaternary ostracodes are being studied from the Central American region. The overall goal of this...
Climatic impact of glacial cycle polar motion: Coupled oscillations of ice sheet mass and rotation pole position
Bruce G. Bills, Thomas S. James, John G. Mengel
1999, Journal of Geophysical Research B: Solid Earth (104) 1059-1075
Precessional motion of Earth's rotation axis relative to its orbit is a well-known source of long-period climatic variation. It is less well appreciated that growth and decay of polar ice sheets perturb the symmetry of the global mass distribution enough that the geographic location of the rotation axis will change...
Sediment chronology in San Francisco Bay, California, defined by 210Pb, 234Th, 137Cs, and 239,340Pu
C. C. Fuller, Alexander van Geen, M. Baskaran, R. Anima
1999, Marine Chemistry (64) 7-27
Sediment chronologies based on radioisotope depth profiles were developed at two sites in the San Francisco Bay estuary to provide a framework for interpreting historical trends in organic compound and metal contaminant inputs. At Richardson Bay near the estuary mouth, sediments are highly mixed by biological and/or physical processes. Excess <span...
Potential endocrine disrupting organic chemicals in treated municipal wastewater and river water
Larry B. Barber, Greg K. Brown, Steven D. Zaugg
1999, Conference Paper, Analysis of environmental endocrine disruptors
Select endocrine disrupting organic chemicals were measured in treated wastewater from Chicago, IL, Minneapolis/St. Paul, MN, Detroit, MI, and Milwaukee, WI, and in the Des Plaines, Illinois, and Minnesota Rivers during the fall of 1997 and the spring of 1998. Emphasis was given to alkylphenolpolyethoxylate (APEO) derived compounds, although 17-??-estradiol,...
The ecological condition of estuaries in the Gulf of Mexico
1999, Cooperator Report 620-R-98-004
The Gulf of Mexico is a vast natural resource encompassing the coastal areas of western Florida, Alabama, Mississippi, Louisiana, and Texas, as well as a portion of Mexico. Many estuaries flow into the Gulf of Mexico and serve as nursery grounds for fish, habitat for a wide variety of wildlife,...
Environmental models of mineral deposits- A state of the art
Richard B. Wanty, Byron R. Berger, Geoffrey S. Plumlee
1999, Geologica Hungarica. Series geologica (24) 97-106
Although mineral deposits have been classified by their geologic and mineralogical characteristics for decades, the recognition that mineral deposits also could be classified by their environmental characteristics is relatively new. In the past 5 years, numerous advancements have been made in this subject area, building on the earlier work of...
Modern accumulation rates and a sediment budget for the Eel shelf: a flood-dominated depositional environment
Christopher K. Sommerfield, Charles A. Nittrouer
1999, Marine Geology (154) 227-241
The northern California continental margin is periodically impacted by geologically significant storms, which have a marked influence on terrigenous sediment supply, flood deposition, and long-term accumulation of fine-grained sediment on the Eel shelf. Accumulation of Eel River muds on the adjacent shelf was investigated using 210Pb and 137Cs geochronologies, in...
Chapter 6 Geochemistry, isotopic composition and petrogenetic modelling of the Thera pyroclastics
T. H. Druitt, L. Edwards, R. M. Mellors, D. M. Pyle, R. S. J. Sparks, Marvin A. Lanphere, M. Davies, B. Barreirio
1999, Geological Society, London, Memoirs (19) 89-116
This chapter examines the major element, trace element, and isotope geochemistry of the Thera pyroclastics, and places it in the context of the geochemical evolution of the whole volcanic field. Geochemical studies to date have been undertaken predominantly on the lavas, and the pyroclastic succession has been relatively neglected. The...
Chapter 5: Cumulate nodules in the Thera pyroclastics
T. H. Druitt, L. Edwards, R. M. Mellors, D. M. Pyle, R. S. J. Sparks, Marvin A. Lanphere, M. Davies, B. Barreirio
1999, Geological Society, London, Memoirs (19) 79-88
Gabbroic and dioritic nodules are common in some horizons of the Thera pyroclastics. These nodules contain pyroxene as the main ferromagnesian phase in contrast to the early Akrotiri centre, which contain nodules with abundant hornblende (Nicholls 1971a; Pichler & Kussmaul 1972). Calcsilicate nodules and gabbroic nodules have also been recognized...
Robustness of closed capture-recapture methods to violations of the closure assumption
William L. Kendall
1999, Ecology (80) 2517-2525
Closed-population capture–recapture methods have been used extensively in animal ecology, both by themselves and within the context of Pollock’s robust design and multistate models, to estimate various parameters of population and community dynamics. The defining assumption of geographic and demographic closure (i.e., no births, deaths, immigration, or emigration) for the...
Evaluation of weights of evidence to predict epithermal-gold deposits in the Great Basin of the western United States
Gary L. Raines
1999, Natural Resources Research (8) 257-276
The weights-of-evidence method provides a simple approach to the integration of diverse geologic information. The application addressed is to construct a model that predicts the locations of epithermal-gold mineral deposits in the Great Basin of the western United States. Weights of evidence is a data-driven method requiring known deposits and...
Estimation of methanogen biomass via quantitation of coenzyme M
Dwayne A. Elias, Lee R. Krumholz, Ralph S. Tanner, Joseph M. Suflita
1999, Applied and Environmental Microbiology (65) 5541-5545
Determination of the role of methanogenic bacteria in an anaerobic ecosystem often requires quantitation of the organisms. Because of the extreme oxygen sensitivity of these organisms and the inherent limitations of cultural techniques, an accurate biomass value is very difficult to obtain. We standardized a simple method for estimating methanogen...
Evaluation of factors that influence estimated zones of transport for six municipal wells in Clark County, Washington
L.L. Orzol, Margot Truini
1999, Water-Resources Investigations Report 97-4224
A ground-water flow model was used in conjunction with particle tracking to estimate zones of transport for six municipal well sites in Clark County, Washington. A zone of transport for a well is a three-dimensional volume within a ground-water system that contains all of the ground water that will discharge...
A comparison of the weights-of-evidence method and probabilistic neural networks
Donald A. Singer, Ryoichi Kouda
1999, Natural Resources Research (8) 287-298
The need to integrate large quantities of digital geoscience information to classify locations as mineral deposits or nondeposits has been met by the weights-of-evidence method in many situations. Widespread selection of this method may be more the result of its ease of use and interpretation rather than comparisons with alternative...
SEGY to ASCII: Conversion and Plotting Program
Mark R. Goldman
1999, Open-File Report 99-126
This report documents a computer program to convert standard 4 byte, IBM floating point SEGY files to ASCII xyz format. The program then optionally plots the seismic data using the GMT plotting package. The material for this publication is contained in a standard tar file (of99-126.tar) that is uncompressed and...
Comparison of kinetic-model predictions of deep gas generation
A.A. Henry, M. D. Lewan
1999, Open-File Report 99-326
Geographic information system (GIS) procedure for preliminary delineation of debris-flow hazard areas from a digital terrain model, Madison County, Virginia
R. H. Campbell, P. G. Chirico
1999, Open-File Report 99-336
U.S. Geological Survey middle Rio Grande basin study; proceedings of the third annual workshop, Albuquerque, New Mexico, February 24-25, 1999
James R. Bartolino
1999, Open-File Report 99-203
Approximately 40 percent (about 600,000 people) of the total population of New Mexico lives within the Middle Rio Grande Basin, which includes the City of Albuquerque. Ongoing analyses of the central portion of the Middle Rio Grande Basin by the U.S. Geological Survey (USGS) in cooperation with the City of Albuquerque and...
Analytical results and conceptual model of mine drainage at the Holden Mine, Chelan County, Washington
J.E. Kilburn, D. B. Smith, S. J. Sutley
1999, Open-File Report 99-348
Hydrologic data for water years 1978-97 used in daily flow-routing and river-operations models for the upper Carson River Basin, California and Nevada
G. W. Hess
1999, Open-File Report 99-256
No abstract available....
Mississippi Basin Carbon Project; upland soil database for sites in Yazoo Basin, northern Mississippi
J.W. Harden, T. L. Fries, T.G. Huntington
1999, Open-File Report 99-319
The conversion of land from its native state to an agricultural use commonly results in a significant loss of soil carbon (Mann, 1985; Davidson and Ackerman, 1993). Globally, this loss is estimated to account for as much as 1/3 of the net CO2 emissions for the period of 1850 to...
Quantitative paleoclimatic reconstructions from late Pleistocene plant macrofossils of the Yucca Mountain region
R.S. Thompson, K. H. Anderson, P. J. Bartlein
1999, Open-File Report 99-338
Plant macrofossil assemblages recovered from packrat (Neotoma) middens of late Pleistocene age from the present-day Mojave Desert of southern Nevada contain plant species that today live at higher elevations and/or farther north than the midden collection sites. Previous reconstructions of late Pleistocene climates from packrat midden assemblages in this region...
Digital analytical data from mineral resource assessments of national forest lands in Washington
D. E. Boleneus, D. W. Chase
1999, Open-File Report 99-344-A
Extensive reconnaissance assessments of the mineral resource potential of the Colville and Okanogan National Forests in northeastern Washington were conducted during 1979-1982 by a private consultant A.R. Grant, under contract with the U.S. Department of Agriculture, Forest Service. These forests occupy large parts of Pend Oreille, Stevens, Ferry, and Okanogan...
