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Page 2939, results 73451 - 73475

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Implications for evaporite tectonism in the Carbondale and Eagle collapse centers of west-central Colorado, based on reprocessed seismic reflection data
William J. Perry Jr., John J. Miller, Robert B. Scott
2002, Special Paper of the Geological Society of America (366) 55-72
Reprocessing of approximately 64 km of seismic reflection data along five seismic lines has led to new interpretations of evaporite tectonism associated with the Pennsylvanian Eagle Valley Evaporite of the central Colorado trough. Evidence of the oldest evaporite tectonism in the region, imaged by the seismic data, occurs in the...
Statistical analysis of stream water-quality data and sampling network design near Oklahoma City, central Oklahoma, 1977-1999
Mark E. Brigham, Gregory A. Payne, William J. Andrews, Marvin M. Abbott
2002, Water-Resources Investigations Report 2002-4111
Water-quality data collected from 1993-99 at five sites on Bluff, Deer, and Chisholm Creeks and from 1988-99 at five sites in the North Canadian River indicated that there were significant differences in constituent values among sites for water properties, major ions, trace elements, nutrients, turbidity, pesticides, and bacteria. Concentrations of...
Estimating mean annual streamflow of rural streams in Kentucky
G. R. Martin
2002, Water-Resources Investigations Report 2002-4206
Mean annual streamflow ( Q a ), defined as the mean of the series of annual mean streamflow values, was determined for selected rural stream sites in Kentucky. Streamflow data for the available period of record through the 1999 water year (October 1, 1998-September 30, 1999) at 235 continuous-record streamflow-gaging...
Occurrence of selected volatile organic compounds and soluble pesticides in Texas public water-supply source waters, 1999-2001
Barbara June Mahler, Michael G. Canova, Marcus O. Gary
2002, Fact Sheet 020-02
During 1999–2001, the U.S. Geological Survey, in cooperation with the Texas Natural Resource Conservation Commission, collected samples of untreated water from 48 public water-supply reservoirs and 174 public water-supply wells. The samples were analyzed for volatile organic compounds (VOCs) and soluble pesticides; in addition, well samples were analyzed for nitrite...
Thermal maturity patterns (CAI and %Ro) in the Ordovician and Devonian rocks of the Appalachian basin in Pennsylvania
John E. Repetski, Robert T. Ryder, John A. Harper, Michael H. Trippi
2002, Open-File Report 2002-302
 This report presents a series of new thermal maturation maps for Pennsylvania, based on conodont color alteration index (CAI) and vitrinite reflectance (%Ro). Also, RockEval and total organic carbon (TOC) data are included in the report. Two Paleozoic intervals were studied: Middle Ordovician carbonate rocks and Lower and Middle Devonian...
Ecological resource management: A call to arms
J.M. Emlen, Lawrence Kapustka, L. Barnthouse, N. Beyer, G. Biddinger, T. Kedwards, W. Landis, C. Menzie, W. Munns, M. Sorenson, R. Wentsel
2002, Ecological Society Bulletin (83) 269-271
As the human population enlarges, it becomes increasingly difficult to sustain valued ecological resources. Human use of resources, whether it is the harvest of ocean fisheries, logging of forests, or farming...
Dissolved pesticides in the Alamo River and the Salton Sea, California, 1996-97
Kathryn L. Crepeau, Kathryn Kuivila, Brian A. Bergamaschi
2002, Open-File Report 2002-232
Water samples were collected from the Alamo River and the Salton Sea, California, in autumn 1996 and late winter/early spring 1997 and analyzed for dissolved pesticides. The two seasons chosen for sampling were during pesticide application periods in the Imperial Valley. Pesticide concentrations were measured in filtered water samples using...
Standard errors of annual discharge and change in reservoir content data from selected stations in the lower Colorado River streamflow-gaging station network, 1995-99
David W. Anning
2002, Water-Resources Investigations Report 2001-4240
The Bureau of Reclamation is currently (1995–2001) testing the Lower Colorado River Accounting System as a method to estimate the consumptive use of Colorado River water by diverters from Hoover Dam to Mexico. Consumptive use is estimated in the Lower Colorado River Accounting System method, in part, on the basis of the annual...
Generalized hydrogeology and ground-water budget for the C Aquifer, Little Colorado River Basin and parts of the Verde and Salt River Basins, Arizona and New Mexico
Robert J. Hart, John J. Ward, Donald J. Bills, Marilyn E. Flynn
2002, Water-Resources Investigations Report 2002-4026
The C aquifer underlies the Little Colorado River Basin and parts of the Verde and Salt River Basins and is named for the primary water-bearing rock unit of the aquifer, the Coconino Sandstone. The areal extent of this aquifer is more than 27,000 square miles. More than 1,000 well and...
Fracture-correlated lineaments at Great Bay, southeastern New Hampshire
James R. Degnan, Stewart F. Clark
2002, Open-File Report 2002-13
Analysis by remote-sensing techniques and observations of exposed bedrock structure were preliminary steps taken in a study to locate potential bedrock-fracture zones that may store and transmit ground water near Great Bay, N.H. To help correlate lineaments on the surface with fractures, structural measurements were made at exposed bedrock, largely...
Hydrogeology and simulation of ground-water flow and land-surface subsidence in the Chicot and Evangeline aquifers, Houston area, Texas
Mark C. Kasmarek, Eric W. Strom
2002, Water-Resources Investigations Report 2002-4022
In November 1997, the U.S. Geological Survey, in cooperation with the City of Houston Utilities Planning Section and the City of Houston Department of Public Works & Engineering, began an investigation of the Chicot and Evangeline aquifers in the greater Houston area in Texas to better understand the hydrology, flow,...