Paleomagnetic and 40Ar/39Ar geochronologic data from late Proterozoic mafic dikes and sills, Montana and Wyoming
Stephen S. Harlan, John William Geissman, Lawrence W. Snee
1997, Professional Paper 1580
Paleomagnetic and 40Ar/39Ar results from mafic dikes and sills in northwestern Wyoming and western Montana yield similar virtual geomagnetic poles and isotopic dates. In combination with paleomagnetic and geochronologic data from elsewhere in the western Cordillera, these data provide evidence for a regional mafic magnetic event at 780 to 770...
Trends in acetochlor concentrations in surface waters of the White River Basin, Indiana, 1994–96
Charles G. Crawford
1997, Fact Sheet 1997–0058
Corn herbicides are used extensively in the White River Basin and account for about 70 percent of the total agricultural pesticide use in the basin. Acetochlor, a corn herbicide registered for use in 1994, is expected to reduce the total amount of corn herbicides used because of its broad-spectrum weed...
Occurrence of selected organochlorine compounds in fish tissue from eastern Iowa streams, 1995
Linda R. Roberts
1997, Fact Sheet 027-97
Human activities have caused dramatic changes to our Nation's landscape for over a century. Use of synthetic organic compounds in agriculture and industry has resulted in the accumulation and persistence of some of these compounds in natural systems. Concern has arisen over the contamination of our Nation's waters and the...
Use of tracer injections and synoptic sampling to measure metal loading from acid mine drainage
Briant A. Kimball
1997, Fact Sheet 245-96
Thousands of abandoned and inactive mines are located in environmentally sensitive mountain watersheds. Cost-effective remediation of the effects of metals from mining in these watersheds requires knowledge of the most significant sources of metals. The significance of a given source depends on the toxicity of a particular metal, how much...
Geologic maps and petrochemistry of the Precambrian rocks of the Reese Mountain-Hightower SW and Potato Creek areas, Albany and Platte counties, Wyoming
G. L. Snyder, D. F. Siems, G.A. Wandless, L.D. Nealey, A.J. Bartel, E. L. Brandt
1997, IMAP 2234
Research on acidic metal contaminants in Pinal Creek Basin near Globe, Arizona
James G. Brown, Robert Brew, Judson W. Harvey
1997, Fact Sheet 005-97
No abstract available....
Geohydrology and simulation of ground-water flow for the Ohio River alluvial aquifer near Owensboro, northwestern Kentucky
M.D. Unthank
1997, Water-Resources Investigations Report 96-4274
The Ohio River alluvial aquifer is the primary source of drinking water for the residents of Owensboro and Daviess County and adjacent counties in Kentucky. The aquifer consists of sand and gravel deposits that partly fill a bedrock-valley system consisting of shales of Pennsylvanian age. The valley is a result...
Geohydrology and water quality of stratified-drift aquifers in the Winnipesaukee River Basin, central New Hampshire
J. D. Ayotte
1997, Water-Resources Investigations Report 94-4150
The use of stable carbon- and nitrogen-isotope data in quantifying cyanide loss from nine wastewaters
R. O. Rye, C. A. Johnson
1997, Open-File Report 97-82
Delineation of ground-water basins and recharge areas for municipal water-supply springs in a karst aquifer system in the Elizabethtown area, northern Kentucky
C.J. Taylor
1997, Water-Resources Investigations Report 96-4254
Ground-water basins and recharge areas for municipal water-supply springs for the Elizabethtown area, northern Kentucky, were delineated using a hydrogeologic-mapping approach, potentiometric map interpretation, anddye-tracing tests. Five distinct ground-water basins drained by major karst springs are present in the Elizabethtown area. These basins are composed of...
Concentrations of platinum group elements in 122 U.S. coal samples
C.L. Oman, R. B. Finkelman, S.J. Tewalt
1997, Open-File Report 97-53
Analysis of more than 13,000 coal samples by semi-quantitative optical emission spectroscopy (OES) indicates that concentrations of the platinum group elements (iridium, palladium, platinum, osmium, rhodium, and ruthenium) are less than 1 ppm in the ash, the limit of detection for this method of analysis. In order to accurately determine...
Determining concentrations of 2-bromoallyl alcohol and dibromopropene in ground water using quantitative methods
Sandra Y. Panshin
1997, Open-File Report 97-43
A method for determining levels of 2-bromoallyl alcohol and 2,3-dibromopropene from ground-water samples using liquid/liquid extraction followed by gas chromatography/mass spectrometry is described. Analytes were extracted from the water using three aliquots of dichloromethane. The aliquots were combined and reduced in volume by rotary evaporation followed by evaporation using a...
Structural transect across the central Carlin Trend, Eureka County, Nevada
S. G. Peters
1997, Open-File Report 97-55
Saline-water contamination in Quaternary deposits and the Poplar River, East Poplar Oil Field, northeastern Montana
J.N. Thamke, S. D. Craigg
1997, Water-Resources Investigations Report 97-4000
The extent of saline-water contamination in Quaternary deposits in and near the East Poplar oil field may be as much as 12.4 square miles and appears to be present throughout the entire saturated zone. The saline-water contamination affects 9-60 billion gallons of ground water. Saline- contaminated water moves...
Geologic map of the Monterey and Seaside 7.5-minute quadrangles, Monterey County, California: A digital database
Joseph C. Clark, William R. Dupre, Lewis I. Rosenberg
1997, Open-File Report 97-30
No abstract available....
Metamorphic and structural evidence for significant vertical displacement along the Ross Lake fault zone, a major orogen-parallel shear zone in the Cordillera of western North America
J. A. Baldwin, D.L. Whitney, H. A. Hurlow
1997, Tectonics (16) 662-681
Results of an investigation of the petrology and structure of the Skymo complex and adjacent terranes constrain the amount, timing, and sense of motion on a segment of the > 600-km-long Late Cretaceous - early Tertiary Ross Lake fault zone (RLFZ), a major orogen-parallel shear zone in the Cordillera of...
Delineation and extent of saltwater intrusion in the Biscayne aquifer, eastern Dade County, Florida, 1995
Roy S. Sonenshein
1997, Water-Resources Investigations Report 96-4285
No abstract available....
Everyone lives downstream: Water-quality issues related to urban development of the upper Chattahoochee River watershed
Daniel J. Hippe, Caryl J. Wipperfurth, Evelyn A. Hopkins, Elizabeth A. Frick, David J. Wangsness
1997, Water-Resources Investigations Report 96-4302
No abstract available....
CHIM; an electrogeochemical partial extraction method; an historical overview
D.B. Hoover, D. B. Smith, R. W. Leinz
1997, Open-File Report 97-92
A Graphical-User Interface for the U.S. Geological Survey modular three-dimensional finite-difference ground-water flow model (MODFLOW-96) using Argus Numerical Environments
A.M. Shapiro, Joshua Margolin, Shahar Dolev, Yaacov Ben-Israel
1997, Open-File Report 97-121
World Wide Web home page for the South Platte NAWQA
Sharon L. Qi, Kevin F. Dennehy
1997, Fact Sheet 242-96
A World Wide Web home page for the U.S. Geological Survey's (USGS) National Water-Quality Assessment (NAWQA) Program, South Platte River Basin study is now online. The home page includes information about the basinwide investigation and provides viewing and downloading access to physical, chemical, and biological data collected by the study...
GeoChange Global Change Data
Water Resources Division, U.S. Geological Survey
1997, Fact Sheet 026-97
GeoChange is an online data system providing access to research results and data generated by the U.S. Geological Survey's Global Change Research Program. Researchers in this program study climate history and the causes of climatic variations, as well as providing baseline data sets on contemporary atmospheric chemistry, high-resolution meteorology, and...
Water-quality summary of the San Marcos Springs Riverine System, San Marcos, Texas, July-August 1994
R.N. Slattery, Lynne Fahlquist
1997, Fact Sheet 059-97
San Marcos Springs is the second largest spring in Texas and is the headwaters for the San Marcos River in San Marcos. Spring Lake (fig. 1) was built in 1848 at the site of a marsh formed by the springs to provide hydropower to a mill. The San Marcos River...
Geologic maps showing structural modes in the Goshute Mountains and Toano Range, Elko County, Nevada
K. B. Ketner
1997, IMAP 2546
Pesticides in surface waters: Current understanding of distribution and major influences
Steven J. Larson, Paul D. Capel, Michael S. Majewski
1997, Fact Sheet 039-97
This report summarizes a comprehensive analysis of existing information on national and regional patterns of pesticide occurrence in surface waters of the United States and the major influences on the sources and transport of pesticides. It is one of a four-part series that synthesizes current knowledge and understanding of pesticides...
