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Page 2914, results 72826 - 72850

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Flow-system analysis of the Madison and Minnelusa aquifers in the Rapid City area, South Dakota — Conceptual model
Andrew J. Long, Larry D. Putnam
2002, Water-Resources Investigations Report 2002-4185
The conceptual model of the Madison and Minnelusa aquifers in the Rapid City area synthesizes the physical geography, hydraulic properties, and ground-water flow components of these important aquifers. The Madison hydrogeologic unit includes the karstic Madison aquifer, which is defined as the upper, more permeable 100 to 200 ft of...
Sociocultural dimensions of supply and demand for natural aggregate; examples from the Mid-Atlantic region, United States
Gilpin R. Robinson Jr., William M. Brown
2002, Open-File Report 2002-350
The United States uses large quantities of natural aggregate to build and maintain a continuously expanding infrastructure. In recent years, per capita demand for aggregate in the United States has grown to about 9.7 metric tons (10.7 tons) per person per year. Over the next 25 years, the aggregate industry...
Preliminary report on geophysical data in Yavapai County, Arizona
V.E. Langenheim, J.P. Hoffmann, K.W. Blasch, Ed DeWitt, Laurie Wirt
2002, Open-File Report 2002-352
Recently acquired geophysical data provide information on the geologic framework and its effect of groundwater flow and on stream/aquifer interaction in Yavapai County, Arizona. High-resolution aeromagnetic data reflect diverse rock types at and below the topographic surface and have permitted a preliminary interpretation of faults and underlying rock types (in...
Maps Showing Sea Floor Topography, Sun-Illuminated Sea Floor Topography, and Backscatter Intensity of Quadrangles 1 and 2 in the Great South Channel Region, Western Georges Bank
Page C. Valentine, Tammie J. Middleton, Jeremy T. Malczyk, Sarah J. Fuller
2002, IMAP 2698
The Great South Channel separates the western part of Georges Bank from Nantucket Shoals and is a major conduit for the exchange of water between the Gulf of Maine to the north and the Atlantic Ocean to the south. Water depths range mostly between 65 and 80 m in the...
Field-trip guide to the geology of the Lexington Reservoir and Loma Prieta areas in the Santa Cruz Mountains, Santa Clara and Santa Cruz Counties, California
Philip W. Stoffer, Paula Messina
2002, Open-File Report 2002-221
This guide contains a road log and five stop descriptions for a field trip in the southern Santa Cruz Mountains. The trip officially begins at the boat dock parking area on Alma Bridge Road near the dam of Lexington Reservoir. Stop 1 involves a walk up the Limekiln Trail to...
Digital soils survey map of the Patagonia Mountains, Arizona
Laura Norman, Craig Wissler, D. Phillip Guertin, Floyd Gray
2002, Open-File Report 2002-324
The ‘Soil Survey of Santa Cruz and Parts of Cochise and Pima Counties, Arizona,' a product of the USDA’s Soil Conservation Service and the Forest Service in cooperation with the Arizona Agricultural Experiment...
High-Resolution Multichannel Seismic-Reflection Data Acquired in the Northern Gulf of Mexico, 1998-99
Patrick E. Hart, Alan K. Cooper, David C. Twichell, Myung Lee, Warren Agena
2002, Open-File Report 2002-368
During June 1998 and April 1999, the U.S. Geological Survey (USGS) conducted two research cruises in the northern Gulf of Mexico to acquire high-resolution seismic reflection data across the upper and middle continental slope as part of an investigation of the seismic character, distribution, and potential effects of naturally-occurring marine...
Digital map of the elevation of the base of the High Plains Aquifer in the Republican River Basin upstream of Hardy, Nebraska, in parts of Nebraska, Kansas, and Colorado
Michaela R. Johnson, James F. Cornwall, Matthew K. Landon
2002, Open-File Report 2002-64
This digital spatial data set consists of the aquifer base elevation contours (50-foot contour interval) for part of the High Plains aquifer in the central United States. This subset of the High Plains aquifer covers the Republican River Basin in Nebraska, Kansas, and Colorado upstream from the streamflow station on...
Rocks and geology in the San Francisco Bay region
Philip W. Stoffer
2002, Bulletin 2195
The landscape of the San Francisco Bay region is host to a greater variety of rocks than most other regions in the United States. This introductory guide provides illustrated descriptions of 46 common and important varieties of igneous, sedimentary, and metamorphic rock found in the region. Rock types are described...
USGS environmental studies of the World Trade Center area, New York City, after September 11, 2001
Roger N. Clark, Greg Meeker, Geoffrey S. Plumlee, Gregg A. Swayze
2002, Fact Sheet 050-02
Two days after the September 11, 2001, attack on World Trade Center (WTC), the U.S. Geological Survey (USGS) was asked by the U.S. Environmental Protection Agency (EPA) and the U.S. Public Health Service to conduct a remote sensing and mineralogical characterization study of lower Manhattan around the WTC. This study, conducted...
Streamflow gain/loss in the Republican River basin, Nebraska, March 1989
Michaela R. Johnson, Jennifer S. Stanton, James F. Cornwall, Matthew K. Landon
2002, Open-File Report 2002-87
This arc and point data set contains streamflow measurement sites and reaches indicating streamflow gain or loss under base-flow conditions along the Republican River and tributaries in Nebraska during March 21 to 22, 1989 (Boohar and others, 1990). These measurements were made to obtain data on ground-water/surface-water interaction. Flow was...
Streamflow gain/loss in the Republican River basin, Nebraska, May 1975
Michaela R. Johnson, Jennifer S. Stanton, James F. Cornwall, Matthew K. Landon
2002, Open-File Report 2002-79
This arc and point data set contains streamflow-measurement sites and reaches indicating streamflow gain or loss under base-flow conditions along Republican River tributaries in Dundy and Chase Counties, Nebraska during May 19 to 20, 1975 (U.S. Geological Survey, 1976). The streamflow measurements were made to obtain data on ground-water/surface-water interaction....
Overview of catastrophic landslides of South America in the twentieth century
Robert Schuster, Daniel A. Salcedo, Luis Valenzuela
2002, Reviews in Engineering Geology (15) 1-34
This chapter summarizes the processes and effects of the most notable catastrophic mass movement events in South America in the twentieth century. We present 23 case histories of individual and regional landslide events, beginning at the northeast terminus of the Andes Mountains in Venezuela, proceeding counterclockwise down the Pacific Coast...
Late Cenozoic deformation by evaporite tectonism in the Grand Hogback monocline, southwest of the White River uplift, Colorado
Robert B. Scott, Bruce Bryant, William J. Perry Jr.
2002, Special Paper of the Geological Society of America (366) 121-148
Along 50 km of the complex, southwest-dipping, Laramide Grand Hogback monocline, which wraps around the southwest flank of the White River uplift in westcentral Colorado, detailed mapping provides evidence of late Cenozoic collapse that resulted from subsurface flow, diapirism, and dissolution of Pennsylvanian Eagle Valley Evaporite. Numerous discontinuous, small-amplitude, strike-parallel...