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Geochemical baseline studies and relations between water quality and streamflow in the Upper Blackfoot watershed, Montana: Data for July 1997-December 1998
Sonia A. Nagorski, Johnnie N. Moore, David B. Smith
2001, Open-File Report 2001-59
We used ultraclean sampling techniques to study the solute (operationally defined as <0.2 ?m) surface water geochemistry at five sites along the Upper Blackfoot River and four sites along the Landers Fork, some in more detail and more regularly than others. We collected samples also from Hogum Creek, a tributary to the Blackfoot,...
USGS Mineral Resources Program; national maps and datasets for research and land planning
S. W. Nicholson, D. B. Stoeser, S. D. Ludington, Frederic H. Wilson
2001, Fact Sheet 079-01
The U.S. Geological Survey, the Nation’s leader in producing and maintaining earth science data, serves as an advisor to Congress, the Department of the Interior, and many other Federal and State agencies. Nationwide datasets that are easily available and of high quality are critical for addressing a wide range of...
Isostatic gravity map of the Death Valley ground-water model area, Nevada and California
D. A. Ponce, R.J. Blakely, R. L. Morin, E. A. Mankinen
2001, Miscellaneous Field Studies Map 2381-C
An isostatic gravity map of the Death Valley groundwater model area was prepared from over 40,0000 gravity stations as part of an interagency effort by the U.S. Geological Survey and the U.S. Department of Energy to help characterize the geology and hydrology of southwest Nevada and parts of California....
Core descriptions, core photographs, physical property logs and surface textural data of sediment cores recovered from the continental shelf of the Monterey Bay National Marine Sanctuary during the research cruises M-1-95-MB, P-2-95-MB, and P-1-97-MB
Kevin M. Orzech, Wendy E. Dahl, Brian D. Edwards
2001, Open-File Report 2001-107
In response to the 1992 creation of the Monterey Bay National Marine Sanctuary (MBNMS), the United States Geological Survey (USGS) initiated a multiyear investigation of the Sanctuary continental margin. As part of the investigative effort, this report summarizes the shipboard procedures, subsequent laboratory analyses, and data results from three seafloor...
Molluscan faunal distribution in Florida Bay, past and present: An integration of down-core and modern data
G. Lynn Wingard, Jeffrey D. Stoner, Charles W. Holmes
2001, Bulletins of American Paleontology (361)
Statistical comparison of modern molluscan fauna to down-core molluscan assemblages in four cores elucidates changes in the Florida Bay ecosystem during the past 100 to 200 years. Fluctuations within molluscan faunal dominance and diversity patterns suggest a response to changing environmental conditions. Faunal dominance patterns indicate an increase...
Researchers consider U.S. Southwest's response to warmer, drier conditions
Kevin M. Schmidt, Robert Webb
2001, Eos, Transactions, American Geophysical Union (82) 475-478
In 2000, the popular press frequently referred to reports that the southwestern United States might experience a shift from relatively wet to dry conditions during the next couple of decades (see http://topex‐www.jpl.nasa.gov/discover/PDO.html). These predictions stemmed from observations that the Pacific Decadal Oscillation (PDO) appeared to abruptly change from a “positive”...
Magnetostratigraphy of the Eocene-Oligocene San Lorenzo and Vaqueros formations, Santa Cruz Mountains, California; implications for California biostratigraphic zonations
D.R. Prothero, Joey Sutton, E. E. Brabb
2001, Book chapter, Pacific Section, Society of Economic Paleontologists and Mineralogists
The San Lorenzo and Vaqueros formations in the Santa Cruz Mountains are the only place in the Pacific Coast that provide a superposed record of the middle Eocene to late Oligocene Narizian, Refugian, and Zemorrian benthic foraminiferal stages, and also yields planktonic microfossils that can be used to correlate these...
Magnetic stratigraphy of the lower middle Eocene (type Ulatsian) Vacaville Shale, Solano County, California
D.R. Prothero, E. E. Brabb
2001, Book chapter, Pacific Section, Society of Economic Paleontologists and Mineralogists
Mallory (1959) designated exposures of the Vacaville Shale on Ulatis Creek, northwest o Vacaville, California, as the type section of his lower middle Eocene Ulatisian benthic foraminiferal stage. Magnetic samples were taken from the 75 m of exposed section, and yielded a stable remanence held mainly in magnetite which passed...
Analysis of late Quaternary faulting in San Diego Bay and hazard to the Coronado Bridge
Michael P. Kennedy, Samuel H. Clarke Jr.
2001, California Geology (54) 4-17
Southern California is transected by numerous pervasive northwest-trending Quaternary fault zones. Together they form the broad transform-fault boundary along which the Pacific and North America crustal plates move irregularly past one another in a right-lateral sense at a rate of about 5 centimeters (cm)/year. The city of San Diego, which...
Marine Cretaceous-Tertiary boundary section in southwestern South Dakota
Dennis O. Terry Jr., John A. Chamberlain Jr., Philip W. Stoffer, Paula Messina, Patricia Jannett
2001, Geology (29) 1055-1058
A distinctive zone of disrupted strata, which we interpret as a distal manifestation of the end-Cretaceous Chicxulub impact event, occurs over 300 km2 in southwestern South Dakota. This disrupted zone is within the Fox Hills Formation, ranges from 0.5 to 5 m in thickness, and contains large-scale slump-roll structures, clastic dikes,...
Dynamic computer model for the metallogenesis and tectonics of the Circum-North Pacific
Christopher R. Scotese, Warren J. Nokleberg, James W.H. Monger, Ian O. Norton, Leonid M. Parfenov, Alexander I. Khanchuk, Thomas K. Bundtzen, Kenneth M. Dawson, Roman A. Eremin, Yuri F. Frolov, Kazuya Fujita, Nikolai A. Goryachev, Anany I. Pozdeev, Vladimir V. Ratkin, Sergey M. Rodinov, Ilya S. Rozenblum, David W. Scholl, Vladimir I. Shpikerman, Anatoly A. Sidorov, David B. Stone
2001, Open-File Report 2001-261
The digital files on this report consist of a dynamic computer model of the metallogenesis and tectonics of the Circum-North Pacific, and background articles, figures, and maps. The tectonic part of the dynamic computer model is derived from a major analysis of the tectonic evolution of the Circum-North Pacific which...
Chromium
J.F. Papp, B. R. Lipin
2001, Open-File Report 2001-381
Gravity data along LARSE (Los Angeles Regional Seismic Experiment) Line II, southern California
R .J. Wooley, V.E. Langenheim
2001, Open-File Report 2001-375
The U.S. Geological Survey conducted a detailed gravity study along part of the Los Angeles Regional Seismic Experiment (LARSE) transect across the San Fernando Basin and Transverse Ranges to help characterize the structure underlying this area. 249 gravity measurements were collected along the transect and to augment regional coverage near...
Drilling, Construction, Water-Level, and Water-Quality Information for the Kualapuu Deep Monitor Well, 4-0800-01, Molokai, Hawaii
Delwyn S. Oki, Glenn R. Bauer
2001, Open-File Report 2001-350
A monitor well was completed in January 2001 by the U.S. Geological Survey in the Kualapuu area of central Molokai, Hawaii that allows for monitoring the thicknesses of the freshwater body and the upper part of the underlying freshwater-saltwater transition zone. The well was drilled in cooperation with the State...
Reprocessing of multi-channel seismic-reflection data collected in the Chukchi Sea
Warren F. Agena, Myung W. Lee, Patrick E. Hart
2001, Open-File Report 2001-330
Contained on this set of two CD-ROMs are stacked and migrated multi-channel seismic-reflection data for 44 lines recorded in the Chukchi Sea, northern Alaska, by the United States Geological Survey in 1977, 1978, and 1980. All data were reprocessed by the USGS in 2000 using updated methods. The resulting final...