Geologic map of the Sunnymead 7.5' quadrangle, Riverside County, California
Douglas M. Morton, Jonathan C. Matti
2001, Open-File Report 2001-450
Open-File Report 01-450 contains a digital geologic map database of the Sunnymead 7.5’ quadrangle, Riverside County, California that includes: ARC/INFO (Environmental Systems Research Institute, http:/www.esri.com) version 7.2.1 coverages of the various elements of the geologic map. A Postscript file to plot the geologic map on a topographic base, containing a Correlation of...
The internal structure of sand bars on the Colorado River, Grand Canyon, as determined by ground-penetrating radar
Walter A. Barnhardt, Robert Kayen, David Rubin, Diane L. Minasian
2001, Open-File Report 2001-425
High-resolution, subsurface imagery from ground-penetrating radar (GPR) has revealed the internal structure of sand bars at seven sites on the Colorado River, Grand Canyon. Based on reconnaissance-level surveys, we recognized three stratigraphic units and several intervening unconformities. Unit A, which exhibits hyperbolic reflections and always occurs at the base of...
Tampa Bay, Florida, March 22, 1991
Water Resources Division, U.S. Geological Survey
2001, Open-File Report 2001-9
This poster has been prepared for education purposes. Colors are near neutral. Water and swampy areas are blue-black. Healthy plant growth is green. Agricultural fields and areas with low plant growth are pink and beige. Highways, parking lots, and other black surfaces are purple. Beach sand, cleared land, and cement...
A simple calculator of ballistic trajectories for blocks ejected during volcanic eruptions
Larry G. Mastin
2001, Open-File Report 2001-45
During the past century, numerous observers have described the violent ejection of large blocks and bombs from volcanoes during volcanic explosions. Minakami (1942) mapped the locations of blocks ejected from Asama Volcano during explosions in 1937. He developed a mathematical expression relating initial velocity and trajectory angle of ejected blocks...
Preliminary mineralogical characterization of weathered and less-weathered strata of the Meade Peak phosphatic shale member of the Permian Phosphoria Formation: Measured sections C and D, Dry Valley, Caribou County, Idaho
Andrew C. Knudsen, Mickey E. Gunter, James R. Herring
2001, Open-File Report 2001-72
This study used powder X-ray diffraction, with Rietveld quantification software to quantify and characterize the mineralogy of the 83 samples collected from two stratigraphic sections measured by the U.S. Geological Survey at the Dry Valley mine in the Meade Peak Member of the Phosphoria Formation. Analyses show extensive variability of...
Potentiometric surfaces of the intermediate aquifer system, west-central Florida, September 2000
A. D. Duerr
2001, Open-File Report 2001-114
The intermediate aquifer system underlies a 5,000-square-mile area within the Southwest Florida Water Management District including De Soto, Sarasota, Hardee, Manatee, and parts of Charlotte, Hillsborough, Highlands, Polk, and Lee Counties. The intermediate aquifer system is overlain by the surficial aquifer system and is underlain by the Floridan aquifer system....
Mineral potential modelling of gold and silver mineralization in the Nevada Great Basin — A GIS-based analysis using weights of evidence
Mark J. Mihalasky
2001, Open-File Report 2001-291
The distribution of 2,690 gold-silver-bearing occurrences in the Nevada Great Basin was examined in terms of spatial association with various geological phenomena. Analysis of these relationships, using GIS and weights of evidence modelling techniques, has predicted areas of high mineral potential where little or no mining activity exists. Mineral potential...
Basement geophysical interpretation of the National Petroleum Reserve Alaska (NPRA), Northern Alaska
R. W. Saltus, T. L. Hudson, J. D. Phillips
2001, Open-File Report 2001-476
Colorado vermiculite deposits: mines, prospects, and occurrences
Bradley S. VanGosen, Alfred L. Bush
2001, Open-File Report 2001-475
Publications of Volcano Hazards Program 2000
Manuel Nathenson
2001, Open-File Report 2001-464
The Volcano Hazards Program of the U.S. Geological Survey (USGS) is part of the Geologic Hazards Assessments subactivity as funded by Congressional appropriation. Investigations are carried out in the Geology and Hydrology Disciplines of the USGS and with cooperators at the Alaska Division of Geological and Geophysical Surveys, University of...
Results of chemical and stable isotopic analyses of water samples collected in the Patagonia Mountains, southern Arizona
Richard B. Wanty, Wayne C. Shanks III, Paul Lamothe, A. L. Meier, Fred Lichte, Paul H. Briggs, Byron R. Berger
2001, Open-File Report 2001-463
Water samples were collected in the Patagonia Mountains in February, 1997. Most of the samples were collected from portals of abandoned mines, or from stream drainages immediately downstream from abandoned mines. Most of the samples have low pH ( 1000 mg/L). Anion composition of...
Geologic map of the Steele Peak 7.5' quadrangle, Riverside County, California
Douglas M. Morton, Rachel M. Alvarez, Van M. Diep
2001, Open-File Report 2001-449
Open-File Report 01-449 contains a digital geologic map database of the Steele Peak 7.5’ quadrangle, Riverside County, California that includes: ARC/INFO (Environmental Systems Research Institute, http://www.esri.com) version 7.2.1 coverages of the various elements of the geologic map. A Postscript file to plot the geologic map on a topographic base, and containing a...
Inferred oil and gas reserve estimates for the United States
E. D. Attanasi
2001, Open-File Report 2001-447
Landslides triggered by Hurricane Mitch in Guatemala -- inventory and discussion
Robert C. Bucknam, Jeffrey A. Coe, Manuel Mota Chavarria, Jonathan W. Godt, Arthur C. Tarr, Lee-Ann Bradley, Sharon A. Rafferty, Dean Hancock, Richard L. Dart, Margo L. Johnson
2001, Open-File Report 2001-443
The torrential rains that accompanied Hurricane Mitch in October and November of 1998 triggered thousands of landslides in the moderate to steep terrain bordering the Motagua and Polochic Rivers in eastern Guatemala. Using aerial photographs taken between January and March 2000 we mapped all visible landslides larger than about 15 m in minimum dimension in a study area of...
Potentiometric surface of the upper Floridan Aquifer, west-central Florida, September 2000
A. D. Duerr
2001, Open-File Report 2001-115
A test of a mechanical multi-impact shear-wave seismic source
David M. Worley, Jack K. Odum, Robert A. Williams, William J. Stephenson
2001, Open-File Report 2001-440
We modified two gasoline-engine-powered earth tampers, commonly used as compressional-(P) wave seismic energy sources for shallow reflection studies, for use as shear(S)-wave energy sources. This new configuration, termed ?Hacker? (horizontal Wacker?), is evaluated as an alternative to the manual sledgehammer typically used in conjunction with a large timber held down...
Land use change and effects on water quality and ecosystem health in the Lake Tahoe basin, Nevada and California
William Forney, Lora Richards, Kenneth D. Adams, Timothy B. Minor, Timothy G. Rowe, J. LaRue Smith, Christian G. Raumann
2001, Open-File Report 2001-418
Human activity in the Lake Tahoe Basin has increased substantially in the past four decades, causing significant impacts on the quality and clarity of the lake's famous deep, clear water. Protection of Lake Tahoe and the surrounding environment has become an important activity in recent years. A variety of agencies,...
Chemical composition of samples collected from waste rock dumps and other mining-related features at selected phosphate mines in southeastern Idaho, western Wyoming, and northern Utah
Phillip R. Moyle, J. Douglas Causey
2001, Open-File Report 2001-411
This report provides chemical analyses for 31 samples collected from various phosphate mine sites in southeastern Idaho (25), northern Utah (2), and western Wyoming (4). The sampling effort was undertaken as a reconnaissance and does not constitute a characterization of mine wastes. Twenty-five samples were collected from waste rock dumps,...
A field conference on Impacts of coalbed methane development in the Powder River basin, Wyoming
Romeo M. Flores, Gary D. Stricker, Joseph F. Meyer, Thomas E. Doll, Pierce H. Norton, Robert J. Livingston, M. Craig Jennings, Scott Kinney, Heather Mitchell, Steve Dunn
2001, Open-File Report 2001-126
Coalbed methane (CBM) development from the Paleocene Fort Union Formation coal beds in the Powder River Basin in Wyoming has been rapidly expanding since 1993. During the past ten years the number of CBM producing wells rose to about 4,000 wells as of October, 2000. About 3,500 of these wells...
High-resolution seismic reflection/refraction images near the outer margin of the Chesapeake Bay impact crater, York-James Peninsula, southeastern Virginia
R. D. Catchings, D.E. Saulter, D.S. Powars, M. R. Goldman, J.A. Dingler, G. S. Gohn, J.S. Schindler, G.H. Johnson
2001, Open-File Report 2001-407
Powars and Bruce (1999) showed that the Chesapeake Bay region of southeastern Virginia was the site of an asteroid or comet impact during the late Eocene, approximately 35 million years ago (Fig. 1). Initial borehole and marine seismic-reflection data revealed a 90-km-diameter impact structure, referred to as the Chesapeake Bay...
Images of the World Trade Center site show thermal hot spots on September 16 and 23, 2001
Roger N. Clark, Robert O. Green, Gregg A. Swayze, Todd M. Hoefen, K. Eric Livo, Betina Pavi, Chuck Sarcher, Joe Boardman, J. Sam Vance
2001, Open-File Report 2001-405
Locatable mineral reports for South Dakota and Colorado, provided to the U.S. Forest Service in fiscal years 2000 and 2001
Anna B. Wilson
2001, Open-File Report 2001-401
Facies analysis of late Proterozoic through Lower Cambrian rocks of the Death Valley regional ground-water system and surrounding areas, Nevada and California
Donald S. Sweetkind, Diane K. White
2001, Open-File Report 2001-351
Altitude and configuration of the potentiometric surface in lower Elk Creek watershed, Chester County, Pennsylvania, March through September 2000
Abdul Mohammad
2001, Open-File Report 2001-329
No abstract available...
Altitude and configuration of the regional potentiometric surface, Willow Grove Naval Air Station/Joint Reserve Base and vicinity, Horsham Township, Montgomery County, Pennsylvania, October 7-8, 1999
Ronald A. Sloto, D.J. Goode, John H. Way
2001, Open-File Report 2001-149
No abstract available ...
