First-principles calibration of 38Ar tracers :implications for the ages of 40Ar/39Ar fluence monitors
Marvin A. Lanphere, G. Brent Dalrymple
2000, Professional Paper 1621
We describe the analytical procedure for first-principles calibrations of 38Ar tracers in the U.S. Geological Survey (USGS) Laboratory in Menlo Park, California. The ages of fluence monitors determined in the USGS laboratory and those reported in the literature differ by nearly 2 percent. However, the radiogenic-40Ar content of the primary...
Living with a restless caldera: Long Valley, California
David P. Hill, Roy A. Bailey, Michael L. Sorey, James W. Hendley II, Peter H. Stauffer
2000, Fact Sheet 108-96
No abstract available ...
Determining the occurrence of pesticides and volatile organic compounds in public water-supply source waters in Texas
B.J. Mahler
2000, Fact Sheet 010-00
Federally owned coal and federal lands in the Northern Rocky Mountains and Great Plains Region
Water Resources Division, U.S. Geological Survey
2000, Fact Sheet 011-00
A tapestry of time and terrain
J.F. Vigil, R.J. Pike, D. G. Howell
2000, IMAP 2720
Organic metamorphism in the California petroleum basins; Chapter B, Insights from extractable bitumen and saturated hydrocarbons
Leigh C. Price
2000, Bulletin 2174-B
Seventy-five shales from the Los Angeles, Ventura, and Southern San Joaquin Valley Basins were extracted and analyzed. Samples were chosen on the basis of ROCK-EVAL analyses of a much larger sample base. The samples ranged in burial temperatures from 40 ? to 220 ? C, and contained hydrogen-poor to hydrogen-rich organic matter (OM), based on OM visual typing and a...
Volcanic ash fall - a "hard rain" of abrasive particles
Christopher A. Kenedi, Steven R. Brantley, James W. Hendley II, Peter H. Stauffer
2000, Fact Sheet 027-00
Geologic map of the Corcoran Canyon Quadrangle, Nye County, Nevada
D. R. Shawe, Richard F. Hardyman, Frank M. Byers Jr.
2000, IMAP 2680
Laboratory performance in the Sediment Laboratory Quality-Assurance Project, 1996-98
John D. Gordon, Carla A. Newland, Shane T. Gagliardi
2000, Water-Resources Investigations Report 99-4184
This report describes the results of the first 3 years of an ongoing study of sediment laboratories used by the U.S. Geological Survey (USGS). The sediment laboratories currently in operation constitute the entire USGS national laboratory system for sediment analyses. As with all environmental data, physical sediment data can be...
Vermont
Water Resources Division, U.S. Geological Survey
2000, Fact Sheet 047-99
Landsat-7 reveals more than just surface features in remote areas of the globe
Thomas P. DeFelice, D. J. Meyer, G. Xian, J. Christopherson, R. Cahalan
2000, Bulletin of the American Meteorological Society (81) 1047-1049
No abstract available....
Basin level statistical properties of topographic index for North America
Praveen Kumar, Kristine L. Verdin, Susan K. Greenlee
2000, Advances in Water Resources (23) 571-578
For land–atmosphere interaction studies several Topmodel based land-surface schemes have been proposed. For the implementation of such models over the continental (and global) scales, statistical properties of the topographic indices are derived using GTOPO30 (30-arc-second; 1 km resolution) DEM data for North America. River basins and drainage...
Mississippi
Water Resources Division, U.S. Geological Survey
2000, Fact Sheet 025-99
South Dakota
Water Resources Division, U.S. Geological Survey
2000, Fact Sheet 043-99
Finding your way with map and compass
Water Resources Division, U.S. Geological Survey
2000, Fact Sheet 079-99
A topographic map tells you where things are and how to get to them, whether you're hiking, biking, hunting, fishing, or just interested in the world around you. These maps describe the shape of the land. They define and locate natural and manmade features like woodlands, waterways, important buildings, and bridges. They show the distance between any two places,...
Sidescan-sonar imagery, surface sediment samples, and surficial geologic interpretation of the southwestern Washington inner continental shelf based on data collected during Corliss Cruises 97007 and 98014
David C. Twichell, V.A. Cross, K. F. Parolski
2000, Open-File Report 2000-167
No abstract available....
Geologic framework and processes of Lake Pontchartrain, Louisiana
Water Resources Division, U.S. Geological Survey
2000, Fact Sheet 025-00
Occurrence, distribution, and concentration of hydrocarbons in and near the Shell Valley Aquifer, North Dakota
Wayne R. Berkas
2000, Open-File Report 99-194
Water samples from 27 wells completed in and near the Shell Valley aquifer were analyzed for benzene, toluene, ethylbenzene, and xylene (BTEX), polynuclear aromatic hydrocarbons (PAH), polychlorinated biphenyls (PCB), and pentachlorophenol (PCP) using the enzyme-linked immunoassay method. The analyses indicated the presence of PAH, PCB, and PCP in the study...
The Jajur coal deposit, northwestern Armenia
Brenda S. Pierce, Gourgen Malkhasian, Artur Martirosyan
2000, Bulletin 2176
Summary of the major water-quality findings from the Eastern Iowa Basins study unit of the National Water-Quality Assessment Program
Stephen J. Kalkhoff
2000, Iowa Groundwater Quarterly (11)
An integrated assessment of the water quality in streams and aquifers in the Wapsipinicon, Iowa, Cedar, and Skunk River basins was conducted in 1996 through 1998 as part of the Eastern Iowa Basins (EIWA) study unit of the U.S. Geological Survey's National Water-Quality Assessment Program (NAWQA). The EIWA study unit...
Chamber measurement of surface-atmosphere trace gas exchange: Numerical evaluation of dependence on soil interfacial layer, and source/sink products
G.L. Hutchinson, G.P. Livingston, R. W. Healy, Robert G. Striegl
2000, Journal of Geophysical Research D: Atmospheres (105) 8865-8875
We employed a three-dimensional finite difference gas diffusion model to simulate the performance of chambers used to measure surface-atmosphere tace gas exchange. We found that systematic errors often result from conventional chamber design and deployment protocols, as well as key assumptions behind the estimation of trace gas exchange rates...
Biogeochemistry: Hexadecane decay by methanogenesis
Robert T. Anderson, Derek R. Lovely
2000, Nature (404) 722-723
The potential for the biological conversion of long-chain saturated hydrocarbons to methane under anaerobic conditions has been demonstrated by using an enrichment culture of bacteria to degrade pure-phase hexadecane. The formation of methane in hydrocarbon-rich subsurface zones could be explained if a similar conversion of long-chain alkanes to methane were...
Bacon receives 1999 Bowen Award
Wes Hildreth, Charles R. Bacon
2000, Eos, Transactions, American Geophysical Union (81) 159-164
Charles R. Bacon received the 1999 Bowen Award, presented by the Volcanology Geochemistry, and Petrology Section during the 1999 AGU Fall Meeting....
Geochemical evidence for a magmatic CO2 degassing event at Mammoth Mountain, California, September-December 1997
K.A. McGee, T.M. Gerlach, R. Kessler, M.P. Doukas
2000, Journal of Geophysical Research B: Solid Earth (105) 8447-8456
Recent time series soil CO2 concentration data from monitoring stations in the vicinity of Mammoth Mountain, California, reveal strong evidence for a magmatic degassing event during the fall of 1997 lasting more than 2 months. Two sensors at Horseshoe Lake first recorded the episode on September 23, 1997, followed 10...
Silica-coated titania and zirconia colloids for subsurface transport field experiments
Joseph N. Ryan, Menachem Elimelech, Jenny L. Baeseman, Robin D. Magelky
2000, Environmental Science & Technology (34) 2000-2005
Silica-coated titania (TiO2) and zirconia (ZrO2) colloids were synthesized in two sizes to provide easily traced mineral colloids for subsurface transport experiments. Electrophoretic mobility measurements showed that coating with silica imparted surface properties similar to pure silica to the titania and zirconia colloids. Measurements of steady electrophoretic mobility and size...
