Digital structural mapping of Mars
J. M. Dohm, R. C. Anderson, K. L. Tanaka
1998, Astronomy and Geophysics (39) 3.20-3.22
Magmatic and tectonic activity have both contributed significantly to the surface geology of Mars. Digital structural mapping techniques have now been used to classify and date centers of tectonic activity in the western equatorial region. For example, our results show a center of tectonic activity at Valles Marineris, which may...
Modelling of instream flow needs: The link between sediment and aquatic habitat
Robert T. Milhous
1998, Regulated Rivers: Research & Management (14) 79-94
Instream flows are needed to remove undesirable accumulations of sediment. Fines and sand accumulate on and in gravels during periods of low flow and must be removed (flushed) periodically in order for the gravel to continue as suitable habitat for aquatic animals. Sediment of all sizes can also fill pools...
Using hydrogeology to site wetland compensation
Michael V. Miller, Christine S. Fucciolo, James J. Miner
1998, Conference Paper, Proceedings of the ASCE Wetlands Engineering River Restoration Conference
The Illinois State Geological Survey has designed an initial site evaluation (ISE) procedure to rapidly separate candidate sites that have favorable hydrogeologic characteristics for wetland restoration or creation from sites where success is doubtful or difficult. ISE aims to focus compensation efforts on sites where former wetland hydrology can be...
Tropical storm flooding of a coastal plain landscape: Extensive floodplains ameliorated potential adverse effects on water quality, fishes, and molluskan communities
W.K. Michener, E.R. Blood, J.B. Box, C. A. Couch, S.W. Golladay, D. J. Hippe, R.J. Mitchell, B.J. Palik
1998, BioScience (48) 696-705
No abstract available....
Regional land cover characterization using Landsat thematic mapper data and ancillary data sources
James E. Vogelmann, Terry L. Sohl, P.V. Campbell, D.M. Shaw
Veith G., editor(s)
1998, Environmental Monitoring and Assessment (51) 415-428
As part of the activities of the Multi-Resolution Land Characteristics (MRLC) Interagency Consortium, an intermediate-scale land cover data set is being generated for the conterminous United States. This effort is being conducted on a region-by-region basis using U.S. Standard Federal Regions. To date, land cover data sets have been...
Studies on the bacterial flora of native freshwater bivalves from the Ohio River
C. E. Starliper, R. Villella, P. Morrison, J. Mathias
1998, Biomedical Letters (58) 85-95
No abstract available. ...
New roles for an old resource: Ferromanganese nodules assist mine cleanup
E. I. Robbins
1998, Geotimes (43) 14-17
[No abstract available]...
Quantitative measure of the variation in fault rheology due to fluid-rock interactions
M.L. Blanpied, C.J. Marone, D.A. Lockner, J.D. Byerlee, D.P. King
1998, Journal of Geophysical Research B: Solid Earth (103) 9691-9712
We analyze friction data from two published suites of laboratory tests on granite in order to explore and quantify the effects of temperature (T) and pore water pressure (Pp) on the sliding behavior of faults. Rate-stepping sliding tests were performed on laboratory faults in granite containing “gouge” (granite powder), both...
Flow of river water into a Karstic limestone aquifer. 1. Tracing the young fraction in groundwater mixtures in the Upper Floridan Aquifer near Valdosta, Georgia
Niel Plummer, E. Busenberg, J. B. McConnell, S. Drenkard, P. Schlosser, R. L. Michel
1998, Applied Geochemistry (13) 995-1015
The quality of water in the Upper Floridan aquifer near Valdosta, Georgia is affected locally by discharge of Withlacoochee River water through sinkholes in the river bed. Data on transient tracers and other dissolved substances, including Cl−, 3H, tritiogenic helium-3 (3He), chlorofluorocarbons (CFC-11, CFC-12,...
Magmagenesis at Soufriere volcano St Vincent, Lesser Antilles Arc
E. Heath, R. Macdonald, H. Belkin, C. Hawkesworth, Haraldur Sigurdsson
1998, Journal of Petrology (39) 1721-1764
Soufriere volcano of St Vincent (<0.6 Ma) is composed of basalts and basaltic andesites, the most mafic of which (mg-number 75) may be representative of the parental magmas of the calc-alkaline suites of the Lesser Antilles arc. Parental, possibly primary, magmas at Soufriere had MgO ∼12.5 wt % and...
Geodynamics of magmatic Cu-Ni-PGE sulfide deposits: New insights from the Re-Os isotope system
D.D. Lambert, J.G. Foster, L.R. Frick, E.M. Ripley, M. L. Zientek
1998, Economic Geology (93) 121-136
In this study, we reassess crustal contamination and sulfide ore-forming processes in some of the largest magmatic ore deposits, using published Re-Os isotope data and a modeling methodology that incorporates the R factor, defined as the effective mass of silicate magma with which a given mass of sulfide magma has...
Chemical gradients in sediment cores from an EPA reference site off the Farallon Islands - Assessing chemical indicators of dredged material disposal in the deep sea
Michael H. Bothner, P.W. Gill, W.S. Boothman, B.B. Taylor, Herman A. Karl
1998, Marine Pollution Bulletin (36) 443-457
Heavy metal and organic contaminants have been determined in undisturbed sediment cores from the US Environmental Protection Agency reference site for dredged material on the continental slope off San Francisco. As expected, the concentrations are significantly lower than toxic effects guidelines, but concentrations of PCBs, PAHs, Hg, Pb, and Clostridium...
Magnetic Susceptibility and Mineral Zonations Controlled by Provenance in Loess along the Illinois and Central Mississippi River Valleys
D.A. Grimley, L.R. Follmer, E.D. McKay
1998, Quaternary Research (49) 24-36
Magnetic susceptibility (MS) patterns have proven useful for regional stratigraphic correlations of zones within thick, oxidized Peoria and Roxana Silts along the Illinois and Central Mississippi River valleys for more than 350 km. Variations in MS of C horizon loess are controlled by silt-sized magnetite content and are interpreted to...
Tribute to Jerome Namias: The Scripps Era
D.R. Cayan
1998, Bulletin of the American Meteorological Society (79) 1089-1095
[No abstract available]...
Earthquake triggering by transient and static deformations
J. Gomberg, N.M. Beeler, M.L. Blanpied, P. Bodin
1998, Journal of Geophysical Research B: Solid Earth (103) 24411-24426
Observational evidence for both static and transient near-field and far-field triggered seismicity are explained in terms of a frictional instability model, based on a single degree of freedom spring-slider system and rate- and state-dependent frictional constitutive equations. In this study a triggered earthquake is one whose failure time has been...
Consideration of measurement error when using commercial indoor radon determinations for selecting radon action levels
G.M. Reimer, S.L. Szarzi, Michael P. Dolan
1998, Conference Paper, Journal of Radioanalytical and Nuclear Chemistry
An examination of year-long, in-home radon measurement in Colorado from commercial companies applying typical methods indicates that considerable variation in precision exists. This variation can have a substantial impact on any mitigation decisions, either voluntary or mandated by law, especially regarding property sale or exchange. Both long-term exposure (nuclear track...
Growth and survival of lake sturgeon larvae fed formulated diets
M. N. DiLauro, W. F. Krise, K. Fynn-Aikins
1998, Progressive Fish-Culturist (60) 293-296
We conducted a 60‐d experiment to ascertain diet‐related differences in survival and growth of larval lake sturgeon Acipenser fulvescens. We offered formulated diets to larval lake sturgeon 2 weeks after first‐feeding to find a suitable formulated diet. The five formulated diets were fed to larvae in combination with live brine shrimp Artemia sp., which...
Coalbed methane resource potential and current prospects in Pennsylvania
A.K. Markowski
1998, International Journal of Coal Geology (38) 137-159
Coalbed methane gas content analyses from exploratory coal cores and existing data indicate that gas content generally increases with increasing depth and rank. The coal beds studied are from the Main Bituminous field of Pennsylvania (which currently contains 24 coalbed methane pools) and the Northern and Southern Anthracite coal fields....
Diets of nestling Gull-billed Terns in coastal Virginia
R.M. Erwin, T.B. Eyler, Jeff S. Hatfield, S. McGary
1998, Waterbirds (21) 323-327
We studied the diets of nestling Gull-billed Terns (Sterna nilotica) at colonies in coastal Virginia during the breeding seasons of 1995 and 1996 as part of a long-term study of the species. No previous quantitative assessments had been made of diets of this species anywhere along the Atlantic Coast, and...
Report from working group on alluvial pedogenesis
W.J. Autin, A. Aslan, E.A. Bettis, P.M. Walthall
1998, Quaternary International (51-52) 85-86
These uses illustrate the complexity of alluvial pedogenesis as it relates to the analysis and interpretation of paleosols. Difficulties with interpretations of alluvial paleosols are probably greatest when applied to the preserved sedimentary record, where direct evidence of paleolandscape variability is scanty or lacking....
The status of Moapa coriacea and Gila seminuda and status information on other fishes of the Muddy River, Clark County, Nevada
G.G. Scoppettone, P.H. Rissler, M.B. Nielsen, J.E. Harvey
1998, Southwestern Naturalist (43) 115-122
Moapa coriacea is endemic to the headwaters (Warm Springs area) of the Muddy River, Clark County, Nevada. The Warm Springs area was snorkeled and Moapa coriacea and Gila seminuda enumerated in August 1994 after a fire, and in May 1997 after a diversion dam had been removed from the downstream...
Determination of phylogenetic relationships of Flavobacterinium psychrophilum (Flexibacterin psychrophilus), Flavobacterinium columnare (Flexibacterin columnaris), and Flexibacterin maritimus by sequence analysis of 16S ribosomal RNA genes amplified by polymerase chain reaction
J.A. Bader, E. B. Shotts Jr.
1998, Journal of Aquatic Animal Health (10) 320-327
The nearly complete small subunit 16S ribosomal RNA (rRNA) gene sequence amplified by polymerase chain reaction was determined for Flavobacterium psychrophilum (formerly Flexibacter psychrophilus) by using automated nucleotide sequencing. The sequence was found to be 1,465 base pairs (bp) in length, a size consistent with previously determined sequences for...
Variability of Secchi disk readings in an exceptionally clear and deep caldera lake
Gary L. Larson, M.W. Buktenica
1998, Archiv fur Hydrobiologie (141) 377-388
SUMMARY: The Peromyscus leucopus on a 17-acre study area were live-trapped, marked, and released over a seven-day period. On the three following nights intensive snap-trapping was done on the central acre of the study plot. The animals caught by snap traps in...
Assessing relative abundance and reproductive success of shrubsteppe raptors
Robert N. Lehman, L.B. Carpenter, Karen Steenhof, Michael N. Kochert
1998, Journal of Field Ornithology (69) 244-256
From 1991-1994, we quantified relative abundance and reproductive success of the Ferruginous Hawk (Buteo regalis), Northern Harrier (Circus cyaneus), Burrowing Owl (Speotytoc unicularia), and Short-eared Owl (Asio flammeus) on the shrubsteppe plateaus (benchlands) in and near the Snake River Birds of Prey National Conservation Area in southwestern Idaho. To assess relative abundance, we searched...
Professionals in environmental education: Helping kids learn about forestry
D.H. Anderson, J.L. Thompson, P.J. Jakes
1998, Journal of Forestry (96) 25-29
A K--8 school in a suburb of St. Paul has formed a partnership with natural resource professionals to create a school forest for environmental education in the field. The university and agency professionals worked with students to teach them the skills necessary to map and inventory their school grounds....
