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Page 2824, results 70576 - 70600

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Regional sediment budget of the Columbia River littoral cell, USA: Analysis of bathymetric- and topographic-volume change
Maarten C. Buijsman, C. R. Sherwood, A. E. Gibbs, G. Gelfenbaum, G. M. Kaminsky, P. Ruggiero, J. Franklin
2003, Open-File Report 2002-281
In this Open-File Report we present calculations of changes in bathymetric and topographic volumes for the Grays Harbor, Willapa Bay, and Columbia River entrances and the adjacent coasts of North Beach, Grayland Plains, Long Beach, and Clatsop Plains for four intervals: pre-jetty - 1920s (Interval 1), 1920s - 1950s (Interval...
Irrigation-induced contamination of water, sediment, and biota in the western United States-synthesis of data from the National Irrigation Water Quality Program
Ralph L. Seiler, Joseph P. Skorupa, David L. Naftz, B. Thomas Nolan
2003, Professional Paper 1655
In October 1985 the U.S. Department of the Interior (DOI), through the National Irrigation Water Quality Program (NIWQP), began a series of field investigations at 26 areas in the Western United States to determine whether irrigation drainage has had harmful effects on fish, wildlife, and humans or has reduced beneficial...
Natural gas hydrate in oceanic and permafrost environments
Michael D. Max
2003, Book
THE BEGINNINGS OF HYDRATE RESEARCH Until very recently, our understanding of hydrate in the natural environment and its impact on seafloor stability, its importance as a sequester of methane, and its potential as an important mechanism in the Earth's climate change system, was masked by our lack of appreciation of...
Mitochondrial phylogeography of moose (Alces alces) in North America
Kris J. Hundertmark, R. Terry Bowyer, Gerald F. Shields, Charles C. Schwartz
2003, Journal of Mammalogy (84) 718-728
Nucleotide variation was assessed from the mitochondrial control region of North American moose (Alces alces) to test predictions of a model of range expansion by stepping-stone dispersal and to determine whether patterns of genetic variation support the current recognition of 4 subspecies. Haplotypes formed a star phylogeny indicative of a...
Importance of a stochastic distribution of floods and erosion thresholds in the bedrock river incision problem
Noah P. Snyder, Kelin X. Whipple, Gregory E. Tucker, D.J. Merritts
2003, Journal of Geophysical Research B: Solid Earth (108)
Fluvial erosion of bedrock occurs during occasional flood events when boundary shear stress exceeds a critical threshold to initiate incision. Therefore efforts to model the evolution of topography over long timescales should include an erosion threshold and should be driven by a stochastic distribution of erosive events. However, most bedrock...
Compositional analyses of lunar pyroclastic deposits
Lisa R. Gaddis, Matthew I. Staid, James A. Tyburczy, B. Ray Hawke, Noah E. Petro
2003, Icarus (161) 262-280
The 5-band Clementine UVVIS data at ∼100 m/pixel were used to examine the compositions of 75 large and small lunar pyroclastic deposits (LPDs), and these were compared to representative lunar maria and highlands deposits. Results show that the albedo, spectral color, and inferred composition of most LPDs are similar to those of low-titanium, mature lunar maria....
A spatial database of bedding attitudes to accompany Geologic map of the greater Denver area, Front Range Urban Corridor, Colorado
Donald E. Trimble, Michael N. Machette, Theodore R. Brandt, David W. Moore, Kyle E. Murray
2003, Open-File Report 2003-25
This digital map shows bedding attitude symbols display over the geographic extent of surficial deposits and rock stratigraphic units (formations) as compiled by Trimble and Machette 1973-1977 and published in 1979 (U.S. Geological Survey Map I-856-H) under the Front Range Urban Corridor Geology Program. Trimble and Machette compiled their...
Velocity ratio and its application to predicting velocities
Myung W. Lee
2003, Bulletin 2197
The velocity ratio of water-saturated sediment derived from the Biot-Gassmann theory depends mainly on the Biot coefficient?a property of dry rock?for consolidated sediments with porosity less than the critical porosity. With this theory, the shear moduli of dry sediments are the same as the shear moduli of water-saturated sediments. Because the...
Geochemistry of Permian rocks from the margins of the Phosphoria Basin: Lakeridge core, western Wyoming
Robert B. Perkins, Brandie McIntyre, James R. Hein, David Z. Piper
2003, Open-File Report 2003-21
The Permian Phosphoria Formation and interbedded units of the Park City Formation and Shedhorn Sandstone in western Wyoming represent deposition along a carbonate ramp at the eastern margin of the Phosphoria Basin, with portions of the Phosphoria units reflecting periods of upwelling and widespread phosphogenesis. Thickness-weighted slab-samples of these units...
Correlation of the Klamath Mountains and Sierra Nevada
William P. Irwin
2003, Open-File Report 2002-490
This report graphically portrays the broadly parallel tectonic development of the Klamath Mountains and Sierra Nevada from early Paleozoic to Early Cretaceous time. It is dedicated to J.S. Diller of the U.S. Geological Survey who, during his pioneer field studies a century ago, recognized significant similarities between these two important...
Economic drivers of mineral supply
Lorie A. Wagner, Daniel E. Sullivan, John L. Sznopek
2003, Open-File Report 2002-335
The debate over the adequacy of future supplies of mineral resources continues in light of the growing use of mineral-based materials in the United States. According to the U.S. Geological Survey, the quantity of new materials utilized each year has dramatically increased from 161 million tons2 in 1900 to 3.2 billion tons in...
A spatial database of bedding attitudes to accompany Geologic Map of Boulder-Fort Collins-Greeley area, Colorado
Roger B. Colton, Theodore R. Brandt, David W. Moore, Kyle E. Murray
2003, Open-File Report 2003-24
This digital map shows bedding attitude data displayed over the geographic extent of rock stratigraphic units (formations) as compiled by Colton in 1976 (U.S.Geological Survey Map I-855-G) under the Front Range Urban Corridor Geology Program. Colton used his own mapping and published geologic maps having varied map unit schemes...
Water-quality, bed-sediment, and biological data, for streams in the upper Prickly Pear Creek watershed, Montana, 2001
Terry L. Klein, Joanna N. Thamke, David D. Harper, Aida M. Farag, David A. Nimick, David L. Fey
2003, Open-File Report 2003-32
The upper Prickly Pear Creek watershed encompasses the upstream 15 miles of Prickly Pear Creek, south of Helena, Montana (fig. 1). The headwaters of Prickly Pear Creek and its tributaries (Beavertown Creek, Clancy Creek, Dutchman Creek, Golconda Creek, Lump Gulch, Spring Creek, and Warm Springs Creek) are primarily in the...
Geologic map of MTM -45252 and-45257 quadrangles, Reull Vallis region of Mars
Scott C. Mest, David A. Crown
2003, IMAP 2763
Mars Transverse Mercator (MTM) quadrangles -45252 and -45257 (latitude 42.5° S. to 47.5°S., longitude 250° W. to 260° W.) cover a portion of the highlands of Promethei Terra east of Hellas basin. The map area consists of heavily cratered ancient highland materials having moderate to high relief, isolated knobs and...