Physiographic rim of the Grand Canyon, Arizona: A digital database
George H. Billingsley, Haydee M. Hampton
1999, Open-File Report 99-30
This Open-File report is a digital physiographic map database. This pamphlet serves to introduce and describe the digital data. There is no paper map included in the Open-File report. The report does include, however, PostScript and PDF format plot files, each containing an image of the map. For those interested...
Late Cenozoic stratigraphy and tephrochronology of the western Black Mountains piedmont, Death Valley, California: Implications for the tectonic development of Death Valley
Jeffrey R. Knott, Andrei M. Sarna-Wojcicki, C.E. Meyer, John Tinsley, S. G. Wells, Elmira Wan
1999, GSA Special Papers (333) 345-366
Geologic mapping combined with the tephrochronology of spatially isolated sedimentary sections along the western Black Mountains piedmont adjacent the Death Valley fault zone (DVFZ) improves the late Cenozoic stratigraphy from relative age to correlated age. Pliocene tephra layers identified in Funeral Formation conglomerates at Artist Drive and Copper Canyon include...
Embryotoxicity of Great Lakes lake trout extracts to developing rainbow trout
Peggy J. Wright, Donald E. Tillitt
1999, Aquatic Toxicology (47) 77-92
Planar halogenated hydrocarbons (PHHs), such as polychlorinated dibenzo-p-dioxins, dibenzofurans, and biphenyls are present in aquatic systems, and are known to produce adverse effects in fish. This study investigated the embryotoxicity of PHH mixtures through the nanoinjection of environmental extracts into newly fertilized eggs from two strains of rainbow trout. Organic...
Wetland restoration, flood pulsing, and disturbance dynamics
Beth A. Middleton
1999, Book
While it is generally accepted that flood pulsing and disturbance dynamics are critical to wetland viability, there is as yet no consensus among those responsible for wetland restoration about how best to plan for those phenomena or even whether it is really necessary to do so at all. In this...
Dietary assimilation of cadmium associated with bacterial exopolymer sediment coatings by the estuarine amphipod Leptocheirus plumulosus: Effects of Cd concentration and salinity
C.E. Schlekat, Alan W. Decho, G.T. Chandler
1999, Marine Ecology Progress Series (183) 205-216
Bacterial extracellular substances (also known as exopolysaccharides, or EPS) may serve as vectors for trophic transfer of metals in benthic systems because these ubiquitous sediment coatings can sorb high concentrations of toxic metals, and because many benthic invertebrates assimilate EPS sediment coatings upon ingestion. We conducted 3...
Source and age of ground-water seepage to streams
Edward Modica
1999, Fact Sheet 063-99
Stormwater runoff for selected watersheds in the Edwards Aquifer recharge zone, Bexar County, Texas, 1996-98
D.J. Ockerman, B.L. Petri, R.N. Slattery
1999, Fact Sheet 172-98
The Edwards aquifer is one of the most productive carbonate aquifers in the Nation. The dissolution-modified, faulted limestone aquifer is the sole source of public water supply for San Antonio, Texas (fig. 1) and is the major source of water for Bexar County. In addition to providing public water supply...
Computer Program for Point Location And Calculation of ERror (PLACER)
Gregory E. Granato
1999, Open-File Report 99-99
A program designed for point location and calculation of error (PLACER) was developed as part of the Quality Assurance Program of the Federal Highway Administration/U.S. Geological Survey (USGS) National Data and Methodology Synthesis (NDAMS) review process. The program provides a standard method to derive study-site locations from site maps in...
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory-Determination of arsenic and selenium in water and sediment by graphite furnace atomic absorption spectrometry
Sandra R. Jones, John R. Garbarino
1999, Open-File Report 98-639
Graphite furnace-atomic absorption spectrometry (GF-AAS) is a sensitive, precise, and accurate technique that can be used to determine arsenic and selenium in samples of water and sediment. The GF-AAS method has been developed to replace the hydride generation-atomic absorption spectrometry (HG-AAS) methods because the method detection limits are similar, bias...
The relationship between species density and community biomass in grazed and ungrazed coastal meadows
James B. Grace, H. Jutila
1999, Oikos (85) 398-408
Previous studies have indicated that the relationship between community biomass and species density can be represented by a multivariate model in which abiotic variables influence species density both through effects on biomass and through effects on the species pool. In this paper, we use data from grazed and ungrazed coastal...
Data on past climate warmth may lead to better model of warm future
Andre Droxler, Richard Z. Poore, Lloyd Burckle
1999, Eos Science News (80) 289-290
Weather bureaus around the world have accumulated daily historical records of atmospheric conditions for more than a century to help forecast meteorological conditions 3 to 5 days ahead. To gain insight into the impact of possible future climate warming and constrain predictive models for a warm future, climatologists are seeking...
Monitoring survival rates of Swainson's Thrush Catharus ustulatus at multiple spatial scales
D.K. Rosenberg, D.F. DeSante, K.S. McKelvey, James E. Hines
1999, Bird Study (46) S198-S208
We estimated survival rates of Swainson's Thrush, a common, neotropical, migratory landbird, at multiple spatial scales, using data collected in the western USA from the Monitoring Avian Productivity and Survivorship Programme. We evaluated statistical power to detect spatially heterogeneous survival rates and exponentially declining survival rates among spatial scales with...
Characterizing fractured-zone flow using numerical flow-log models
Frederick L. Paillet
B. Amadei, R.L. Kranz, G.A. Scott, P.H. Smeallie, editor(s)
1999, Book chapter, Rock mechanics for industry: Proceedings of the 37th U.S. Rock Mechanics Symposium
Water-quality monitoring and hydraulic testing in fractured bedrock aquifers involves two important tasks: 1) identifying the hydraulically active fractures intersecting the borehole, and 2) inferring how the specific entry or exit ports in the borehole wall are connected to large-scale flow paths in the region surrounding the...
Historical trends in salinity and substrate in central and northern Florida Bay: A Paleoecological Reconstruction using modern analogue data
G. Lynn Wingard, Scott E. Ishman
1999, Estuaries (22) 369-383
Understanding the natural spatial and temporal variability that exists within an ecosystem is a critical component of efforts to restore systems to their natural state. Analysis of benthic foraminifers and molluscs from modern monitoring sites within Florida Bay allows us to determine what environmental parameters control...
Real-time control of the robotic lunar observatory telescope
J.M. Anderson, K.J. Becker, H. H. Kieffer, D.N. Dodd
1999, Publications of the Astronomical Society of the Pacific (111) 737-749
The US Geological Survey operates an automated observatory dedicated to the radiometry of the Moon with the objective of developing a multispectral, spatially resolved photometric model of the Moon to be used in the calibration of Earth-orbiting spacecraft. Interference filters are used with two imaging instruments to observe the Moon...
U.S. Geological Survey assessment model for undiscovered conventional oil, gas and NGL resources; the seventh approximation
James W. Schmoker, Timothy R. Klett
1999, Bulletin 2165
Documentation for HYDMOD; a program for extracting and processing time-series data from the U.S. Geological Survey's modular three-dimensional finite-difference ground-water flow model
Randall T. Hanson, Stanley A. Leake
1999, Open-File Report 98-564
This report presents a FORTRAN computer program that generates simulated time-series data as output from the U.S. Geological Survey Modular Finite-Difference Ground-Water Flow Model at user-specified point locations or a collection of points that compose a profile through the modeled region. The program can save time-series data at user-specified locations...
The quality of our nation's waters: Nutrients and pesticides
Water Resources Division, U.S. Geological Survey
1999, Circular 1225
This report is the first in a series of nontechnical publications, 'The quality of our nation's waters,' designed to describe major findings of the National Water-Quality Assessment Program regarding water-quality issues of regional and national concern. Sources, seasonal and geographic patterns of occurrence, and long-term trends are evaluated for nutrients...
Geology of the Thaumasia region, Mars: Plateau development, valley origins, and magmatic evolution
J. M. Dohm, K. L. Tanaka
1999, Planetary and Space Science (47) 411-431
We have constructed the complex geologic history of the Thaumasia region of Mars on the basis of detailed geologic mapping and relative-age dating of rock units and structure. The Thaumasia plateau dominates the region and consists of high lava plains partly surrounded by rugged highlands, mostly of Noachian and Hesperian...
An evaluation of six internal anchor tags for tagging juvenile striped bass
A. Henderson-Arzapalo, P. Rago, J. Skjeveland, M. Mangold, P. Washington, J. Howe, T. King
1999, North American Journal of Fisheries Management (19) 482-493
Six types of internal anchor tags were compared for retention, legibility, and durability in tagging juvenile (age-0) striped bass Morone saxatilis. Tank-reared striped bass (120–200 mm total length) were tagged with coded wire tags and one of six types of internal anchor tags (500 fish each tag type and two...
Does Europa have a subsurface ocean? Evaluation of the geological evidence
Robert T. Pappalardo, Michael J.S. Belton, H.H. Breneman, M. H. Carr, Clark R. Chapman, G.C. Collins, T. Denk, S. Fagents, Paul E. Geissler, B. Giese, R. Greeley, R. Greenberg, J.W. Head, P. Helfenstein, G. Hoppa, S.D. Kadel, K.P. Klaasen, James E. Klemaszewski, K.P. Magee, Alfred S. McEwen, J. M. Moore, W.B. Moore, G. Neukum, C. B. Phillips, L.M. Prockter, G. Schubert, D.A. Senske, R.J. Sullivan, B.R. Tufts, E. P. Turtle, Robert Wagner, K.K. Williams
1999, Journal of Geophysical Research: Planets (104) 24015-24055
It has been proposed that Jupiter's satellite Europa currently possesses a global subsurface ocean of liquid water. Galileo gravity data verify that the satellite is differentiated into an outer H2O layer about 100 km thick but cannot determine the current physical state of this layer (liquid or solid). Here we...
Magnitude and Significance of Carbon Burial in Lakes, Reservoirs, and Northern Peatlands
Water Resources Division, U.S. Geological Survey
1999, Fact Sheet 058-99
It is estimated that freshwater lakes in the world have a total area of about 1.5x1012 m2 (Shiklomanov, 1993; table 1). Including saline inland seas in this total would add another 1x1012 m2. The 28 largest (area of each > 5,000 km2) freshwater lakes in the world have a total...
Field test of two energetic models for yellow perch
J.S. Schaeffer, R.C. Haas, J.S. Diana, J.E. Breck
1999, Transactions of the American Fisheries Society (128) 414-435
Field data from a population of yellow perch Perca flavescens in Saginaw Bay, Lake Huron, were used to evaluate the ability of two energetic models to predict consumption by yellow perch. Field estimates of daily ration for age‐1–4 fish during May through October 1987 and 1988 were compared with...
Cenozoic basins of the Death Valley extended terrane as reflected in regional-scale gravity anomalies
Richard J. Blakely, Robert C. Jachens, James P. Calzia, Victoria Langenheim
1999, GSA Special Papers (333) 1-16
The contrast in density between basin-filling deposits and underlying basement rocks in the Basin and Range province produces a distinctive pattern of gravity anomalies that roughly correlates with basin-and-range topography. This is especially apparent in the Death Valley extended terrane, where minima in residual gravity closely correspond to well-known extensional...
Observations of Phobos, Deimos, and bright stars with the Imager for Mars Pathfinder
Nick Thomas, D.T. Britt, Kenneth E. Herkenhoff, Scott L. Murchie, B. Semenov, H.U. Keller, P. H. Smith
1999, Journal of Geophysical Research E: Planets (104) 9055-9068
The Imager for Mars Pathfinder (IMP) was used to observe several objects during the Martian night. The satellites, Phobos and Deimos, were observed on two occasions each, through the IMP geological filters covering the wavelength range 440 nm to 1 μm. The observations were converted to geometric albedo using triaxial...
