40Ar/39Ar dates for the Spanish Peaks intrusions in south-central Colorado
B.S. Penn, David A. Lindsey
2009, Rocky Mountain Geology (44) 17-32
A diverse suite of spatially and temporally juxtaposed igneous rocks ranging from alkaline lamprophyres to granites intruded south-central Colorado during late Oligocene and early Miocene time. In addition to the stocks of the East and West Spanish Peaks, there are three types of dikes exposed in the region, based on...
Surface rupture map of the 2002 M7.9 Denali fault earthquake, Alaska: Digital data
Peter J. Haeussler
2009, Data Series 422
The November 3, 2002, Mw7.9 Denali Fault earthquake produced about 340 km of surface rupture along the Susitna Glacier Thrust Fault and the right-lateral, strike-slip Denali and Totschunda Faults. Digital photogrammetric methods were primarily used to create a 1:500-scale, three-dimensional surface rupture map, and 1:6,000-scale aerial photographs were used for...
Mesozoic magmatism and base-metal mineralization in the Fortymile mining district, eastern Alaska — Initial results of petrographic, geochemical, and isotopic studies in the Mount Veta area
Cynthia Dusel-Bacon, John F. Slack, John N. Aleinikoff, James K. Mortensen
2009, Professional Paper 1760-A
We present here the initial results of a petrographic, geochemical, and isotopic study of Mesozoic intrusive rocks and spatially associated Zn-Pb-Ag-Cu-Au prospects in the Fortymile mining district in the southern Eagle quadrangle, Alaska. Analyzed samples include mineralized and unmineralized drill core from 2006 and 2007 exploration by Full Metal Minerals,...
Three-dimensional numerical model of ground-water flow in northern Utah Valley, Utah County, Utah
Philip M. Gardner
2009, Scientific Investigations Report 2008-5049
A three-dimensional, finite-difference, numerical model was developed to simulate ground-water flow in northern Utah Valley, Utah. The model includes expanded areal boundaries as compared to a previous ground-water flow model of the valley and incorporates more than 20 years of additional hydrologic data. The model boundary was generally expanded to...
Geography of Alaska lake districts: Identification, description, and analysis of lake-rich regions of a diverse and dynamic state
Christopher D. Arp, Benjamin M. Jones
2009, Scientific Investigations Report 2008-5215
Lakes are abundant landforms and important ecosystems in Alaska, but are unevenly distributed on the landscape with expansive lake-poor regions and several lake-rich regions. Such lake-rich areas are termed lake districts and have landscape characteristics that can be considered distinctive in similar respects to mountain ranges. In this report, we...
Radiocarbon ages and age models for the past 30,000 years in Bear Lake, Utah and Idaho
Steve M. Colman, Robert J. Rosenbauer, Darrell Kaufman, Walter E. Dean, John McGeehin
2009, GSA Special Papers (450) 133-144
Radiocarbon analyses of pollen, ostracodes, and total organic carbon (TOC) provide a reliable chronology for the sediments deposited in Bear Lake over the past 30,000 years. The differences in apparent age between TOC, pollen, and carbonate fractions are consistent and in accord with the origins of these fractions. Comparisons among...
Interacción termal entre magmas graníticos laramídicos y rocas encajonantes mesoproterozoicas: Historia de enfriamiento de intrusivos de la sierrita blanca, NW Sonora
Monica A. Enriquez-Castillo, Alexander Iriondo, Gabriel Chavez-Cabello, Michael J. Kunk
2009, Boletin de la Sociedad Geologica Mexicana (61) 451-483
A semi-quantitative thermochronological study, combining U-Pb and 40Ar/39Ar geochronology, has allowed assessment of the crystallization and cooling history of the Laramide Sierrita Blanca granite as well as the thermal effects resulting from the intrusion into the Mesoproterozoic host rocks (~1.1 Ga Murrieta granite). The U-Pb zircon age discrepancy between two samples...
Quaternary incision rates and drainage evolution of the Uncompahgre and Gunnison Rivers, western Colorado, as calibrated by the Lava Creek B ash
Andrew L. Darling, Karl E. Karlstrom, Andres Aslan, Rex D. Cole, Charles Betton, Elmira Wan
2009, Rocky Mountain Geology (44) 71-83
The Quaternary erosional history of western Colorado is documented in terraces of the Colorado, Gunnison, and Uncompahgre Rivers that contain the Lava Creek B ash (0.64 Ma). This paper reports an important new ash locality that dates ca. 100-m-high river gravels associated with the paleo-confluence of the Gunnison and Uncompahgre...
Hydrologic conditions and a firm-yield assessment for J.B. Converse Lake, Mobile County, Alabama, 1991-2006
Carl S. Carlson, Stacey A. Archfield
2009, Scientific Investigations Report 2008-5005
J.B. Converse (Converse) Lake is the primary source of drinking water for the city of Mobile, Alabama. Concerns regarding the ability of the reservoir to meet current and future water demands during drought conditions have prompted this study. The 1991 through 2006 water years included a drought that occurred during...
A water-leach procedure for estimating bioaccessibility of elements in soils from transects across the United States and Canada
Robert G. Garrett, G.E.M. Hall, J.E. Vaive, P. Pelchat
2009, Applied Geochemistry (24) 1438-1453
An objective of the North American Soil Geochemical Landscapes Project is to provide relevant data concerning bioaccessible concentrations of elements in soil to government and other institutions undertaking environmental studies. A protocol was developed that employs a 1-g soil sample agitated overnight with 40 mL of reverse-osmosis de-ionized water for...
IPANE: Could New England's Early Detection Network benefit eastern Canada?
Les Mehrhoff, Randy G. Westbrooks
2009, Conference Paper, Proceedings of the Weeds Across Borders 2008 Conference
The Invasive Plant Analysis of New England (IPANE: ipane.org) is a multifaceted approach to regional early detection of invasive plants. IPANE, was founded in 2001 to create a comprehensive six state New England regional partnership to: minimize the ecological damage caused by invasive plants; provide reliable and accessible educational material;...
Relative spatial soil geochemical variability along two transects across the United States and Canada
Robert G. Garrett
2009, Applied Geochemistry (24) 1405-1415
To support the development of protocols for the proposed North American Soil Geochemical Landscapes project, whose objective is to establish baselines for the geochemistry of North American soils, two continental-scale transects across the United States and Canada were sampled in 2004. The sampling employed a spatially stratified random sampling design...
Applications of a broad-spectrum tool for conservation and fisheries analysis: Aquatic gap analysis
James E. McKenna Jr., Paul J. Steen, John Lyons, Jana S. Stewart
2009, Gap Analysis Bulletin 44-51
Natural resources support all of our social and economic activities, as well as our biological existence. Humans have little control over most of the physical, biological, and sociological conditions dictating the status and capacity of natural resources in any particular area. However, the most rapid and threatening influences on natural...
Postmortem evaluation of reintroduced migratory Whooping Cranes in eastern North America
Gretchen A. Cole, Nancy Thomas, Marilyn Spaulding, Richard Stroud, Richard P. Urbanek, Barry K. Hartup
2009, Journal of Wildlife Diseases (45) 29-40
Reintroduction of endangered Whooping Cranes (Grus americana) in eastern North America has successfully established a migratory population between Wisconsin and Florida. Eighty birds (47 males, 33 females) were released between 2001 and 2006, and all birds were tracked following release with satellite and/or VHF monitoring devices. By the end of...
Earth's magnetic field complex: U.S. National activities during the Decade of Geopotential Field Research
Michael E. Purucker, T. Sabaka, W. Kuang, S. Maus, Jeffrey J. Love
2009, Conference Paper, ESA 2nd Swarm Int. Sci. Meeting
The US geomagnetism community is supported by NASA, NOAA, USGS, NSF, DOD, and US universities. During the Decade of Geopotential Field Research, inaugurated in 1999 with the launch of the Danish satellite Ørsted on a US rocket, the US community has been involved in satellite mission development and analysis, instrument...
Experimental geostatistical model of a continuous gas accumulation, Rocky Mountains, Utah
Ricardo A. Olea
2009, Conference Paper, Proceedings of the 2009 conference of the International Association for Mathematical Geosciences
No abstract available....
The Columbia River Basalt Group: from the gorge to the sea
Ray E. Wells, Alan R. Niem, Russell C. Evarts, Jonathan T. Hagstrum
2009, GSA Field Guides (15) 737-774
Miocene flood basalts of the Columbia River Basalt Group inundated eastern Washington, Oregon, and adjacent Idaho between 17 and 6 Ma. Some of the more voluminous flows followed the ancestral Columbia River across the Cascade arc, Puget-Willamette trough, and the Coast Range to the Pacific Ocean. We have used field...
Littoral transport rates in the Santa Barbara Littoral Cell: a process-based model analysis
E. P. L. Elias, Patrick L. Barnard, John Brocatus
2009, Journal of Coastal Research 947-951
Identification of the sediment transport patterns and pathways is essential for sustainable coastal zone management of the heavily modified coastline of Santa Barbara and Ventura County (California, USA). A process-based model application, based on Delft3D Online Morphology, is used to investigate the littoral transport potential along the Santa Barbara Littoral...
Selected achievements, science directions, and new opportunities for the WEBB small watershed research program
Pierre D. Glynn, Matthew C. Larsen, Earl A. Greene, Heather L. Buss, David W. Clow, Randall J. Hunt, M. Alisa Mast, Sheila F. Murphy, Norman E. Peters, Stephen D. Sebestyen, James B. Shanley, John F. Walker
2009, Conference Paper, Planning for an uncertain future - Monitoring, integration, and adaptation (SIR 2009-5049)
Over nearly two decades, the Water, Energy, and Biogeochemical Budgets (WEBB) small watershed research program of the U.S. Geological Survey (USGS) has documented how water and solute fluxes, nutrient, carbon, and mercury dynamics, and weathering and sediment transport respond to natural and humancaused drivers, including climate, climate change, and atmospheric...
CO2 storage resources, reserves, and reserve growth: Toward a methodology for integrated assessment of the storage capacity of oil and gas reservoirs and saline formations
Robert Burruss
2009, Energy Procedia (1) 2679-2683
Geologically based methodologies to assess the possible volumes of subsurface CO2 storage must apply clear and uniform definitions of resource and reserve concepts to each assessment unit (AU). Application of the current state of knowledge of geologic, hydrologic, geochemical, and geophysical parameters (contingencies) that control storage volume and injectivity allows definition...
Surveillance and status of fish stocks in western Lake Erie, 2008
Michael T. Bur, William Edwards, Michael J. Porta, Martin A. Stapanian, Patrick Kocovsky
2009, Conference Paper
The Lake Erie Biological Station has conducted bottom trawl assessments of fish populations in western Lake Erie near East Harbor State Park, Ohio each summer and autumn since 1961. The catches of most age-0 forage fishes in 2008 were less than their 15-year means. Mean densities for five species exceeded...
Spring and winter records of the eastern pipistrelle (Perimyotis subflavus) in southeastern New Mexico
Ernest W. Valdez, Keith Geluso, Jennifer Foote, Gosia Allison-Kosior, David M. Roemer
2009, Western North American Naturalist (69) 396-398
Eastern pipistrelles (Perimyotis subflavus) were first documented from South Dakota, western Texas, and New Mexico during recent years, suggesting that the distribution of this species is expanding westward across central parts of North America. In New Mexico, only 2 records of P. subflavus previously were known—one from summer and one from autumn....
Defining and characterizing coolwater streams and their fish assemblages in Michigan and Wisconsin, USA
John Lyons, Troy Zorn, Jana S. Stewart, Paul W. Seelbach, Kevin Wehrly, Lizhu Wang
2009, North American Journal of Fisheries Management (29) 1130-1151
Coolwater streams, which are intermediate in character between coldwater “trout” streams and more diverse warmwater streams, occur widely in temperate regions but are poorly understood. We used modeled water temperature data and fish assemblage samples from 371 stream sites in Michigan and Wisconsin to define, describe, and map coolwater streams...
Audiomagnetotelluric investigation of Snake Valley, eastern Nevada and western Utah
Darcy McPhee, Keith Pari, Frank Baird
2009, Geology and Geologic Resources and Issues of Western Utah 287-298
Audiomagnetotelluric (AMT) data along four profiles in western Snake Valley and the corresponding two-dimensional (2-D) inverse models reveal subsurface structures that may be significant to ground-water investigations in the area. The AMT method is a valuable tool for estimating the electrical resistivity of the earth over depth ranges from...
The Tiptop coal-mine fire, Kentucky: Preliminary investigation of the measurement of mercury and other hazardous gases from coal-fire gas vents
James C. Hower, Kevin R. Henke, Jennifer M.K. O’Keefe, Mark A. Engle, Donald R. Blake, Glenn B. Stracher
2009, International Journal of Coal Geology (80) 63-67
The Tiptop underground coal-mine fire in the Skyline coalbed of the Middle Pennsylvanian Breathitt Formation was investigated in rural northern Breathitt County, Kentucky, in May 2008 and January 2009, for the purpose of determining the concentrations of carbon dioxide (CO2), carbon monoxide (CO), and mercury (Hg) in the vent and...
