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Page 298, results 7426 - 7450

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Interaction between ground water and surface water in the northern Everglades and relation to water budget and mercury cycling; study methods and appendixes
Judson W. Harvey, S.L. Krupa, C.J. Gefvert, Jungyill Choi, R. H. Mooney, J.B. Giddings
2000, Open-File Report 2000-168
The data presented in this report are products of an investigation that quantified interactions between ground water and surface water at several study sites in the northern Everglades. Goals included identifying the major geologic controls and human alterations that affect interactions between ground water and surface water, and determining how...
MODFLOW-2000, The U.S. Geological Survey modular ground-water model: User guide to modularization concepts and the ground-water flow process
Arlen W. Harbaugh, Edward R. Banta, Mary C. Hill, Michael G. McDonald
2000, Open-File Report 00-92
MODFLOW is a computer program that numerically solves the three-dimensional ground-water flow equation for a porous medium by using a finite-difference method. Although MODFLOW was designed to be easily enhanced, the design was oriented toward additions to the ground-water flow equation. Frequently there is a need to solve additional equations;...
Borehole geophysical logs at Naval Weapons Industrial Reserve Plant, Dallas, Texas
Christopher L. Braun, Roberto Anaya, Eve L. Kuniansky
2000, Open-File Report 2000-76
A shallow alluvial aquifer at the Naval Weapons Industrial Reserve Plant near Dallas, Texas, has been contaminated by organic solvents used in the fabrication and assembly of aircraft and aircraft parts. Natural gamma-ray and electromagnetic-induction borehole geophysical logs were obtained from 162 poly vinyl-chloride-cased wells at the plant and were...
The Phosphoria Formation at the Hot Springs Mine in Southeast Idaho: A source of selenium and other trace elements to surface water, ground water, vegetation, and biota
David Z. Piper, J. P. Skorupa, T. S. Presser, M. A. Hardy, S. J. Hamilton, M. Huebner, R. A. Gulbrandsen
2000, Open-File Report 2000-50
Major-element oxides and trace elements in the Phosphoria Formation at the Hot Springs Mine, Idaho were determined by a series of techniques. In this report, we examine the distribution of trace elements between the different solid components aluminosilicates, apatite, organic matter, opal, calcite, and dolomite that largely make up the...
Age and paleoenvironmental significance of mega-invertebrates from the "San Pedro" Formation in the Coyote Hills, Fullerton and Buena Park, Orange County, Southern California
Charles L. Powell II, Dave Stevens
2000, Open-File Report 2000-319
The "San Pedro" Formation in the Coyote Hills contains an invertebrate fossil as-semblage of 184 taxa from 158 localities. The fauna consists of two annelids, 174 mollusks (80 bivalves, 94 gastropods, and three scaphopods), five arthropods, and three echinoids, along with other minor constituents recognized by not specifically identified during...
Suspended sediment in the St. Francis River at St. Francis, Arkansas, 1986-95
W. Reed Green, C. Shane Barks, Alan P. Hall
2000, Open-File Report 99-227
Daily suspended-sediment concentrations were analyzed from the St. Francis River at St. Francis, Arkansas during 1986 through 1995. Suspended-sediment particle size distribution was measured in selected samples from 1978 through 1998. These data are used to assess changes in suspended-sediment concentrations and loads through time. Suspended-sediment concentrations were positively related...
Petroleum system of the Gippsland Basin, Australia
Michele G. Bishop
2000, Open-File Report 99-50-Q
The Gippsland Basin Province 3930, located on the southeastern coast of Australia, is formed from two successive failed rifts that developed into a passive margin during the Cretaceous. Formation of this basin is related to the break up of Gondwana, which resulted in the separation of Antarctica from Australia, and...
Cruise report RV Ocean Surveyor cruise O-1-00-GM the bathymetry and acoustic backscatter of the Pinnacles area, northern Gulf of Mexico May 23, through June 10, 2000 Venice, LA to Venice, LA
James V. Gardner, Kenneth J. Sulak, Peter Dartnell, Laurent Hellequin, Brian R. Calder, Larry A. Mayer
2000, Open-File Report 2000-350
An extensive deep (~100 m) reef tract occurs on the Mississippi-Alabama outer continental shelf (OCS). The tract, known as "The Pinnacles", is apparently part of a sequence of drowned reef complexes along the "40-fathom" shelf edge of the northern Gulf of Mexico (Ludwick and Walton, 1957). It is critical to...