Inversion of gravity data to define the pre-Tertiary surface and regional structures possibly influencing ground-water flow in the Pahute Mesa-Oasis Valley region, Nye County, Nevada
T.G. Hildenbrand, V.E. Langenheim, E. A. Mankinen, E.H. McKee
1999, Open-File Report 99-49
A three-dimensional inversion of gravity data from the Pahute Mesa–Oasis Valley region reveals a topographically complex pre-Tertiary basement surface. Beneath Pahute Mesa, the thickness of the Tertiary volcanic deposits may exceed 5 km within the Silent Canyon caldera complex. South of Pahute Mesa in Oasis Valley, basement is shallower (<...
Microfossil and stable isotope data from the last interglacial records of Ocean Drilling Program (ODP) sites 1018 and 1020
R.Z. Poore, H.J. Dowsett, J.A. Barron, L. Heusser, A. C. Ravelo, A. Mix, A. McMahon
1999, Open-File Report 99-397
Digital aeromagnetic data from the Sandoval-Santa Fe, Belen, and Cochiti airborne surveys; covering areas in Rio Arriba, Sandoval, Santa Fe, Socorro, and Valencia counties, New Mexico
Water Resources Division, U.S. Geological Survey, Sander Geophysics, Geoterrex-Dighem
1999, Open-File Report 99-404
No abstract available....
Lava Falls Rapid in Grand Canyon: Effects of Late Holocene debris flows on the Colorado River
Robert H. Webb, Theodore S. Melis, Peter G. Griffiths, John G. Elliott, Thure E. Cerling, Robert J. Poreda, Thomas W. Wise, James E. Pizzuto
1999, Professional Paper 1591
Lava Falls Rapid is the most formidable reach of whitewater on the Colorado River in Grand Canyon and is one of the most famous rapids in the world. Debris flows in 1939, 1954, 1955, 1966, and 1995, as well as prehistoric events, completely changed flow through the rapid. Floods cleared...
Movement patterns, behavior, and habitat use of razorback sucker stocking into the Green River at Canyonlands National Park, Utah
D.K. Foster, Gordon Mueller
1999, Open-File Report 99-107
Molecular stratigraphy of the Devonian Domanik Formation, Timan-Pechora Basin, Russia
M. L. Tuttle, P. G. Lillis, J.L. Clayton
1999, Open-File Report 99-379
The climatic and hydrologic history of southern Nevada during the Late Quaternary
R. M. Forester, J.P. Bradbury, C. Carter, A. B. Elvidge-Tuma, M.L. Hemphill, S.C. Lundstrom, S. A. Mahan, B.D. Marshall, L.A. Neymark, J.B. Paces, S.E. Sharpe, J. F. Whelan, P.E. Wigand
1999, Open-File Report 98-635
Isostatic gravity map of the Las Vegas 30 x 60 minute quadrangle, California and Nevada
V.E. Langenheim, R.I. Morin, J. G. Davidson, K. M. Schmidt, H. R. Blank Jr.
1999, Open-File Report 99-398
Basic Requirements for Collecting, Documenting, and Reporting Precipitation and Stormwater-Flow Measurements
Peter E. Church, Gregory E. Granato, David W. Owens
1999, Open-File Report 99-255
Accurate and representative precipitation and stormwater-flow data are crucial for use of highway- or urban-runoff study results, either individually or in a regional or national synthesis of stormwater-runoff data. Equally important is information on the level of accuracy and representativeness of this precipitation and stormwaterflow data. Accurate and representative measurements...
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....
Geologic framework for the Puget Sound aquifer system, Washington and British Columbia
M. A. Jones
1999, Professional Paper 1424-C
The Puget-Willamette study area is composed of two distinct subareas, the Puget Sound Lowland and the Willamette Lowland. The study area for this report is the Puget Sound Lowland, which is located in western Washington and in a small part of southwestern British Columbia, Canada. The lowland encompasses an area...
Spatial geologic data model for the Gunnison, Grand Mesa, Uncompahgre National Forests mineral resource assessment area, southwestern Colorado and digital data for the Leadville, Montrose, Durango, and Colorado parts of the Grand Junction, Moab, and Cortez 1° x 2° geologic maps
W. C. Day, G.N. Green, D. H. Knepper Jr., R. C. Phillips
1999, Open-File Report 99-427
The digital geologic and geographic information system (GIS) data presented here were prepared to aid in Grand Mesa, Uncompahgre, Gunnison National Forest (GMUG) mineral resource assessment Project studies by the U.S. Geological Survey Mineral Resource Program. The goals of the GMUG Project is to provide mineral resource data and an...
Water professionals and water policy in the Black Hills region
T.A. Fontaine, D.G. Driscoll, J.W. Erickson, S.J. Kenner, J.F. Sawyer
Eloise Kendy, editor(s)
1999, Conference Paper, Science into policy: water in the public realm: proceedings, specialty conference, June 30-July 2, 1999, Bozeman, Montana
A case study approach based on examples from the Black Hills region is used to evaluate the role of water professionals in developing feasible and fair public policy involving water resources. Examples presented include a long-term hydrologic investigation in the Black Hills, a local wellhead protection program, issues being addressed...
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...
Non-lethal sampling for the detection of Myxobolus cerebralis in asymptomatic rainbow trout
Bane Schill, Thomas Waldrop, Christine Densmore, Vicki Blazer
1999, Book, National Whirling Disease Symposium 1999 Missoula, MT
We have described in previous reports (Schill et al., 1998) the development of a polymerase chain reaction (PCR) amplification of 18S ribosomal RNA for the detection of Myxozoan parasites. Oligonucleotide primers were developed by multiple alignment of Myxozoan sequence information and analysis by a custom-written computer program (PRIM). Candidate pairs...
Global Seismic Hazard Assessment Program (GSHAP) in continental Asia
Peizhen Zhang, Zhi-xian Yang, Harsh K. Gupta, Satish C. Bhatia, Kaye M. Shedlock
1999, Annali di Geofisica (42) 1167-1190
The regional hazard mapping for the whole Eastern Asia was coordinated by the SSB Regional Centre in Beijing, originating from the expansion of the test area initially established in the border region of China-India-Nepal-Myanmar- Bangla Dash, in coordination with the other Regional Centres (JIPE, Moscow, and AGSO, Canberra) and with...
Ups and downs in planetary science
Carolyn S. Shoemaker
1999, Annual Review of Earth and Planetary Sciences (27) 1-17
The field of planetary science as it developed during the lifetimes of Gene and Carolyn Shoemaker has sustained a period of exciting growth. Surveying the skies for planet-crossing asteroids and comets and studying the results of their impact upon the planets, especially the Earth, was for Gene and Carolyn an...
Geology and environmental geochemistry of mercury and gold deposits in the northern part of the California Coast Range mercury mineral belt
James J. Rytuba, Dean A. Enderlin
David L. Wagner, Stephan A. Graham, editor(s)
1999, Geologic field trips in Northern California: centennial meeting of the Cordilleran Section of the Geological Society of America (119) 214-234
Geophysical investigation of the nearshore geologic framework, eastern Casco Bay-Reid State Park, Maine: Data analysis and implications for Late Quaternary coastal evolution
I. V. Buynevich, D. M. FitzGerald, K. F. Parolski
1999, Open-File Report 99-380
No abstract available....
Use of nitrogen isotopes to determine sources of nitrate contamination in two desert basins in California
J.N. Densmore, J.K. Bohlke
1999, IAHS-AISH Publication (260) 63-73
Nitrogen-15/14 isotope ratios (δ15N) were measured in groundwater, infiltrating wastewater, and natural uncontaminated soil to determine the source of high NO3- concentrations in two desert basins at Fort Irwin National Training Center in the Mojave Desert. The abundance and isotopic composition of dissolved nitrogen gas were measured in some of...
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,...
Specific conductance, water temperature, and water level data, San Francisco Bay, California, water year 1998
Paul A. Buchanan
1999, Interagency Ecological Program Newsletter (12) 46-53
Specific conductance and water temperature data are continuously recorded at four sites in San Francisco Bay, California: San Pablo Strait at Point San Pablo, Central San Francisco Bay at Presidio Military Reservation, Pier 24 at Bay Bridge, and South San Francisco Bay at San Mateo Bridge near Foster City (Figure...
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...
The needs of salmon and steelhead in balancing their conservation and use
Carl V. Burger
E. Eric Knudsen, Cleveland R. Steward, Donald D. MacDonald, Jack E. Williams, Dudley W. Reiser, editor(s)
1999, Book chapter, Sustainable fisheries management: Pacific salmon
Over the past 100 years, Pacific salmon Oncorhynchus spp. and steelhead trout O. mykiss populations in the Pacific Northwest have experienced dramatic declines as a result of human population growth and associated development of the region's natural resources. Any strategy to reverse those declines will depend on achieving consensus among...
