Near-decadal changes in nitrate and pesticide concentrations in the South Platte River alluvial aquifer, 1993-2004
S.S. Paschke, K.R. Schaffrath, S.L. Mashbum
2008, Journal of Environmental Quality (37) S281-S295
The lower South Platte River basin of Colorado and Nebraska is an area of intense agriculture supported by surface-water diversions from the river and ground-water pumping from a valley-fill alluvial aquifer. Two well networks consisting of 45 wells installed in the South Platte alluvial aquifer were sampled in the early...
Thermal history of the unsaturated zone at Yucca Mountain, Nevada, USA
J. F. Whelan, L.A. Neymark, R.J. Moscati, B.D. Marshall, E. Roedder
2008, Applied Geochemistry (23) 1041-1075
Secondary calcite, silica and minor amounts of fluorite deposited in fractures and cavities record the chemistry, temperatures, and timing of past fluid movement in the unsaturated zone at Yucca Mountain, Nevada, the proposed site of a high-level radioactive waste repository. The distribution and geochemistry of these deposits are consistent with...
InSAR detects possible thaw settlement in the Alaskan Arctic Coastal Plain
Russell P. Rykhus, Zhong Lu
2008, Canadian Journal of Remote Sensing (34) 100-112
Satellite interferometric synthetic aperture radar (InSAR) has proven to be an effective tool for monitoring surface deformation from volcanoes, earthquakes, landslides, and groundwater withdrawal. This paper seeks to expand the list of applications of InSAR data to include monitoring subsidence possibly associated with thaw settlement over the Alaskan Arctic Coastal...
Soil slip/debris flow localized by site attributes and wind-driven rain in the San Francisco Bay region storm of January 1982
R.J. Pike, S. Sobieszczyk
2008, Geomorphology (94) 290-313
GIS analysis at 30-m resolution reveals that effectiveness of slope-destabilizing processes in the San Francisco Bay area varies with compass direction. Nearly half the soil slip/debris flows mapped after the catastrophic rainstorm of 3-5 January 1982 occurred on slopes that face S to WSW, whereas fewer than one-quarter have a...
Relationship of floodplain ichnocoenoses to paleopedology, paleohydrology, and paleoclimate in the Willwood Formation, Wyoming, during the Paleocene-Eocene Thermal Maximum
J.J. Smith, S.T. Hasiotis, M. J. Kraus, D.T. Woody
2008, Palaios (23) 683-699
Vertical changes in distribution, abundance, and ichnodiversity of ichnocoenoses in alluvial deposits of the Willwood Formation suggest significantly drier moisture regimes in the Bighorn Basin, Wyoming, during the Paleocene-Eocene Thermal Maximum (PETM), a transient period of global warming. The Willwood Formation at Polecat Bench contains an abundant assemblage of ichnofossils,...
Downflow limestone beds for treatment of net-acidic, oxic, iron-laden drainage from a flooded Anthracite Mine, Pennsylvania, USA: 1. Field evaluation
C.A. Cravotta III, S.J. Ward
2008, Mine Water and the Environment (27) 67-85
Passive-treatment systems that route acidic mine drainage (AMD) through crushed limestone and/or organic-rich substrates have been used to remove the acidity and metals from various AMD sources, with a wide range of effects. This study evaluates treatment of net-acidic, oxic, iron-laden AMD with limestone alone, and with organic-rich compost layered...
Ice-walled-lake plains: Implications for the origin of hummocky glacial topography in middle North America
L. Clayton, J.W. Attig, N.R. Ham, M.D. Johnson, C.E. Jennings, K.M. Syverson
2008, Geomorphology (97) 237-248
Ice-walled-lake plains are prominent in many areas of hummocky-till topography left behind as the Laurentide Ice Sheet melted from middle North America. The formation of the hummocky-till topography has been explained by: (1) erosion by subglacial floods; (2) squeezing of subglacial till up into holes in stagnant glacial ice; or...
Peri-equatorial paleolatitudes for Jurassic radiolarian cherts of Greece
I.W. Aiello, J.T. Hagstrum, G. Principi
2008, Tectonophysics (448) 33-48
Radiolarian-rich sediments dominated pelagic deposition over large portions of the Tethys Ocean during middle to late Jurassic time as shown by extensive bedded chert sequences found in both continental margin and ophiolite units of the Mediterranean region. Which paleoceanographic mechanisms and paleotectonic setting favored radiolarian deposition during the Jurassic, and...
The effects of land use on fluvial sediment chemistry for the conterminous U.S. - Results from the first cycle of the NAWQA Program: Trace and major elements, phosphorus, carbon, and sulfur
A. J. Horowitz, V. C. Stephens
2008, Science of the Total Environment (400) 290-314
In 1991, the U.S. Geological Survey (USGS) began the first cycle of its National Water Quality Assessment (NAWQA) Program. The Program encompassed 51 river basins that collectively accounted for more than 70% of the total water use (excluding power generation), and 50% of the drinking water supply in the U.S....
Post-breeding habitat use by adult Boreal Toads (Bufo boreas) after wildfire in Glacier National Park, USA
C.G. Guscio, B. R. Hossack, L.A. Eby, P.S. Corn
2008, Herpetological Conservation and Biology (3) 55-62
Effects of wildfire on amphibians are complex, and some species may benefit from the severe disturbance of stand-replacing fire. Boreal Toads (Bufo boreas boreas) in Glacier National Park, Montana, USA increased in occurrence after fires in 2001 and 2003. We used radio telemetry to track adult B. boreas in a...
Track of the Yellowstone hotspot: Young and ongoing geologic processes from the Snake River Plain to the Yellowstone Plateau and Tetons
Lisa A. Morgan, Kenneth L. Pierce, Pat Shanks
Robert G.H. Raynolds, editor(s)
2008, Book chapter, Roaming the Rocky Mountains and environs: Geological field trips
This field trip highlights various stages in the evolution of the Snake River Plain–Yellowstone Plateau bimodal volcanic province, and associated faulting and uplift, also known as the track of the Yellowstone hotspot. The 16 Ma Yellowstone hotspot track is one of the few places on Earth where time-transgressive processes on...
Brazilian analog for ancient marine environments on Mars
N.T. Bridges, S.J. Hook, B.J. Thomson, J.K. Crowley, Filho C.R. de Souza, J.B. Macambira, Pereira Silva de Lima Silva, G.
2008, Eos, Transactions, American Geophysical Union (89) 329-330
[No abstract available]...
ALLTEM UXO detection and discrimination
T.H. Asch, D.L. Wright, C.W. Moulton, T.P. Irons, M.N. Nabighian
2008, Conference Paper, SEG Technical Program Expanded Abstracts
ALLTEM is a multi-axis electromagnetic induction system designed for unexploded ordnance (UXO) applications. It uses a continuous triangle-wave excitation and provides good late-time signal-to-noise ratio (SNR) especially for ferrous targets. Multi-axis transmitter (Tx) and receiver (Rx) systems such as ALLTEM provide a richer data set from which to invert for...
Priorities for future research on planetary dunes
T.N. Titus, N. Lancaster, R. Hayward, L. Fenton, M. Bourke
2008, Conference Paper, Eos
[No abstract available]...
Diffuse flow hydrothermal manganese mineralization along the active Mariana and southern Izu-Bonin arc system, western Pacific
J.R. Hein, M. S. Schulz, R.E. Dunham, R. J. Stern, S.H. Bloomer
2008, Journal of Geophysical Research B: Solid Earth (113)
Abundant ferromanganese oxides were collected along 1200 km of the active Izu-Bonin-Mariana arc system. Chemical compositions and mineralogy show that samples were collected from two deposit types: Fe-Mn crusts of mixed hydrogenetic/hydrothermal origin and hydrothermal Mn oxide deposits; this paper addresses only the second type. Mn oxides cement volcaniclastic and...
Stochastic and compensatory effects limit persistence of variation in body mass of young caribou
Bruce W. Dale, Layne G. Adams, William B. Collins, Kyle Joly, Patrick Valkenburg, Robert Tobey
2008, Journal of Mammalogy (89) 1130-1135
Nutritional restriction during growth can have short- and long-term effects on fitness; however, animals inhabiting uncertain environments may exhibit adaptations to cope with variation in food availability. We examined changes in body mass in free-ranging female caribou (Rangifer tarandus) by measuring mass at birth and at 4, 11, and 16...
Using semi-permeable membrane devices and stable nitrogen isotopes to detect anthropogenic influences on the Truckee River, USA
L. Saito, Michael R. Rosen, S. Chandra, C.H. Fritsen, J.A. Arufe, C. Redd
2008, Environmental Engineering Science (25) 585-600
Stable nitrogen isotopes (??15N) and semipermeable membrane devices (SPMDs) were used together to provide evidence of potential anthropogenic connections to aquatic organisms in the Truckee River, which flows through the Reno/Sparks metropolitan area in Nevada. Crayfish, snail, and periphyton ??15N values, and SPMD toxicity data collected during high and low...
Trends of pesticides and nitrate in ground water of the Central Columbia Plateau, Washington, 1993-2003
L. Frans
2008, Conference Paper, Journal of Environmental Quality
Pesticide and nitrate data for ground water sampled in the Central Columbia Plateau, Washington, between 1993 and 2003 by the U.S. Geological Survey National Water-Quality Assessment Program were evaluated for trends in concentration. A total of 72 wells were sampled in 1993-1995 and again in 2002-2003 in three well networks...
Utility of shallow-water ATRIS images in defining biogeologic processes and self-similarity in skeletal scleractinia, Florida reefs
B. H. Lidz, J. C. Brock, D.B. Nagle
2008, Conference Paper, Journal of Coastal Research
A recently developed remote-sensing instrument acquires high-quality digital photographs in shallow-marine settings within water depths of 15 m. The technology, known as the Along-Track Reef-Imaging System, provides remarkably clear, georeferenced imagery that allows visual interpretation of benthic class (substrates, organisms) for mapping coral reef habitats, as intended. Unforeseen, however, are...
Fiber‐optic distributed temperature sensing: A new tool for assessment and monitoring of hydrologic processes
John W. Lane Jr., Frederick D. Day-Lewis, Carole D. Johnson, Cian B. Dawson, David L. Nelms, Cheryl A. Eddy-Miller, Jerrod D. Wheeler, Charles F. Harvey, Hanan N. Karam
2008, Conference Paper, Symposium on the Application of Geophysics to Engineering and Environmental Problems 2008
Fiber‐optic distributed temperature sensing (FO DTS) is an emerging technology for characterizing and monitoring a wide range of important earth processes. FO DTS utilizes laser light to measure temperature along the entire length of standard telecommunications optical fibers. The technology can measure temperature every meter over FO cables up to...
Growth, condition, diet, and consumption rates of northern pike in three Arizona reservoirs
J.M. Flinders, Scott A. Bonar
2008, Lake and Reservoir Management (24) 99-111
Northern pike (Esox lucius L.) introductions are controversial in the western United States due to suspected impacts they might have on established sport fisheries and potential illegal introductions. Tbree Arizona reservoirs, Parker Canyon Lake, Upper Lake Mary and Long Lake were sampled to examine the diet, consumption dynamics, and growth...
Advances in quantitative elemental analyses by laser ablation ICP-MS
A.E. Koenig
2008, Conference Paper, Microscopy and Microanalysis
[No abstract available]...
Near-surface location, geometry, and velocities of the Santa Monica Fault Zone, Los Angeles, California
R. D. Catchings, G. Gandhok, M. R. Goldman, D. Okaya, M. J. Rymer, G.W. Bawden
2008, Bulletin of the Seismological Society of America (98) 124-138
High-resolution seismic-reflection and seismic-refraction imaging, combined with existing borehole, earthquake, and paleoseismic trenching data, suggest that the Santa Monica fault zone in Los Angeles consists of multiple strands from several kilometers depth to the near surface. We interpret our seismic data as showing two shallow-depth low-angle fault strands and multiple...
Opaline silica in young deposits on Mars
Ralph E. Milliken, Gregg A. Swayze, Raymond E. Arvidson, Janice L Bishop, Roger N. Clark, Bethany L. Ehlmann, Robert O. Green, John P. Grotzinger, R.V. Morris, Scott L. Murchie, John F. Mustard, C. Weitz
2008, Geology (36) 847-850
High spatial and spectral resolution reflectance data acquired by the Mars Reconnaissance Orbiter Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) instrument reveal the presence of H2O- and SiOH-bearing phases on the Martian surface. The spectra are most consistent with opaline silica and glass altered to various degrees, confirming predictions based...
Birds of the US-Mexico borderlands: Distribution, ecology and conservation
Janet M. Ruth, Tim Brush, David J. Krueper, editor(s)
2008, Studies in Avian Biology (37)
The concept for this volume began as a scientifi c symposium at the North American Ornithological Conference (NAOC) in Veracruz, Mexico in October 2006. The symposium was entitled “Avian Distributional Change, Anthropogenic Challenges, and Recent Avian Research and Technological Advances within the US–Mexico Border Region,” and was cochaired by two...
