Characterization of active faulting beneath the Strait of Georgia, British Columbia
J.F. Cassidy, Gary C. Rogers, F. Waldhauser
2000, Bulletin of the Seismological Society of America (90) 1188-1199
Southwestern British Columbia and northwestern Washington State are subject to megathrust earthquakes, deep intraslab events, and earthquakes in the continental crust. Of the three types of earthquakes, the most poorly understood are the crustal events. Despite a high level of seismicity, there is no obvious correlation between the historical crustal...
Simulations of flooding on Tchoutacabouffa River at State Highways 15 and 67 at D'Iberville, Mississippi
Karl E. Winters
2000, Water-Resources Investigations Report 2001-4007
A two-dimensional finite-element surface-water model was used to simulate the effects of the proposed State Highways 15 and 67 relocation on water-surface elevations and flow distributions for the 100-year flood on the Tchoutacabouffa River at D'Iberville, Mississippi. The Mississippi Department of Transportation plans to relocate State Highways 15 and 67...
Facies patterns and conodont biogeography in Arctic Alaska and the Canadian Arctic Islands: Evidence against juxtaposition of these areas during early Paleozoic time
Julie A. Dumoulin, A. G. Harris, D. C. Bradley, T. A. De Freitas
2000, Polarforschung (68) 257-266
Differences in lithofacies and biofacies suggest that lower Paleozoic rocks now exposed in Arctic Alaska and the Canadian Arctic Islands did not form as part of a single depositional system. Lithologic contrasts are noted in shallow- and deep-water strata and are especially marked in Ordovician and Silurian rocks. A widespread...
Kelp forest fish populations in marine reserves and adjacent exploited areas of central California
M.J. Paddack, J. A. Estes
2000, Ecological Applications (10) 855-870
Population structure (density and size distribution) of 10 species of epibenthic kelp forest fishes was compared between three marine reserves and adjacent exploited areas in central California. We also contrasted substrate relief, algal turf cover, and kelp population density among these areas. Densities of fishes were 12–35% greater within the...
Stanford-USGS shrimp-RG ion microprobe: A new approach to determining the distribution of trace elements in coal
A. Kolker, J. L. Wooden, H.M. Persing, R. A. Zielinski
2000, ACS Division of Fuel Chemistry, Preprints (45) 542-546
The distribution of Cr and other trace metals of environmental interest in a range of widely used U.S. coals was investigated using the Stanford-USGS SHRIMP-RG ion microprobe . Using the oxygen ion source, concentrations of Cr (11 to 176 ppm), V (23 to 248 ppm), Mn (2 to 149 ppm),...
Geochemical effects of rapid sedimentation in aquatic systems: Minimal diagenesis and the preservation of historical metal signatures
E. Callender
2000, Journal of Paleolimnology (23) 243-260
Rapid sedimentation exerts a pronounced influence on early sedimentary diagenesis in that there is insufficient time for a sediment particle to equilibrate in any one sediment layer before that layer may be displaced vertically by another layer. These sedimentation patterns are common in surface-water reservoirs whose sedimentation rates (1-10 cm...
Topsmelt
M. K. Saiki
2000, Book chapter, Baylands ecosystem species and community profiles: life histories and environmental requirements of key plants, fish and wildlife
Abstract not available ...
Jacksmelt
M. K. Saiki
2000, Book chapter
Abstract not available...
Ergosterol
R. J. Rodriguez, L.W. Parks
2000, Book chapter, Encyclopedia of plant pathology
Abstract not available ...
Sea-cliff erosion at Pacifica, California, caused by 1997-98 El Niño storms
Charles B. Snell, Kenneth R. Lajoie, Edward W. Medley
2000, Conference Paper, Proceedings of sessions of Geo-Denver 2000 - Slope stability 2000
Twelve homes were constructed in 1949 at the top of a sea cliff along Esplanade Drive in the City of Pacifica, located on the northern coast of San Mateo County, California. The rear yards of those properties were bounded by an approximately 20-meter (70-foot) high cliff that has retreated episodically...
Relations between the detection of methyl tert-butyl ether (MTBE) in surface and ground water and its content in gasoline
M.J. Moran, M.J. Halde, R.M. Clawges, J.S. Zogorski
2000, Conference Paper, ACS National Meeting Book of Abstracts
The relations between the content of MTBE in gasoline and the detection frequency of MTBE in ground and surface water were analyzed using the percent by volume of MTBE in gasoline provided by NIPER. For groundwater, 21 metropolitan areas had information on detection frequency and percent volume of MTBE in...
Younger Dryas interval and outflow from the Laurentide ice sheet
T.C. Moore Jr., J.C.G. Walker, David K. Rea, C.F.M. Lewis, L.C.K. Shane, A. J. Smith
2000, Paleoceanography (15) 4-18
A boxmodel of the Great Lakes is used to estimate meltwater flow into the North Atlantic between 8000 and 14,000 calendar years B.P. Controls on the model include the oxygen isotopic composition of meltwaters and lake waters as measured in the shells of ostracodes. Outflow rates are highest when oxygen...
Aerial-Photointerpretation of landslides along the Ohio and Mississippi rivers
Wen-June Su, Christopher Stohr
2000, Environmental & Engineering Geoscience (6) 311-323
A landslide inventory was conducted along the Ohio and Mississippi rivers in the New Madrid Seismic Zone of southern Illinois, between the towns of Olmsted and Chester, Illinois. Aerial photography and field reconnaissance identified 221 landslides of three types: rock/debris falls, block slides, and undifferentiated rotational/translational slides. Most of the...
Does Ferocactus wislizeni (Cactaceae) have a between-year seed bank?
Janice E. Bowers
2000, Journal of Arid Environments (45) 197-205
Field and laboratory experiments at Tumamoc Hill, Tucson, Arizona, U.S.A., demonstrated that Ferocactus wislizeni, a common perennial cactus in the northern Sonoran Desert, has a between-year seed bank. In laboratory studies, F. wislizeni seeds lost dormancy during storage at room temperature and had a light requirement for germination. Field experiments...
Modeling the influence of variable pH on the transport of zinc in a contaminated aquifer using semiempirical surface complexation models
D.B. Kent, R.H. Abrams, J.A. Davis, J.A. Coston, D.R. LeBlanc
2000, Water Resources Research (36) 3411-3425
Land disposal of sewage effluent resulted in contamination of a sand and gravel aquifer (Cape Cod, Massachusetts) with zinc (Zn). The distribution of Zn was controlled by pH‐dependent adsorption; the Zn extended 15 m into the 30‐m‐thick sewage plume within approximately 100 m of the source but only 2–4 m...
Fractures and their distribution in the tills of Ohio
C.S. Brockman, J.P. Szabo
2000, Ohio Journal of Science (100) 39-55
Fractures in till may be horizontal, parallel high- to low-angle, or polygonal (when viewed on a horizontal surface). They have been attributed to several geologic processes, the most important of which are desiccation, freeze-thaw, glaciotectonics, and lodgement till deposition. A literature review, a field study, and core examinations have identified...
Forest clearing and regional landsliding
D. R. Montgomery, K. M. Schmidt, H. M. Greenberg, W. E. Dietrich
2000, Geology (28) 311-314
The influence of forest clearing on landsliding is central to long-standing concern over the effects of timber harvesting on slope stability. Here we document a strong topographic control on shallow landsliding by combining unique ground-based landslide surveys in an intensively monitored study area with digital terrain modeling using high-resolution laser...
Pesticide transport in the San Joaquin River Basin
Neil M. Dubrovsky, Charles R. Kratzer, Sandra Y. Panshin, JoAnn M. Gronberg, Kathryn M. Kuivila
2000, Conference Paper, Agrochemical fate and movement
Pesticide occurrence and concentrations were evaluated in the San Joaquin River Basin to determine potential sources and mode of transport. Land use in the basin is mainly agricultural. Spatial variations in pesticide occurrence were evaluated in relation to pesticide application and cropping patterns in three contrasting subbasins...
Enhancements of nonpoint source monitoring of volatile organic compounds in ground water
W.W. Lapham, M.J. Moran, J.S. Zogorski
2000, Journal of the American Water Resources Association (36) 1321-1334
The U.S. Geological Survey (USGS) has compiled a national retrospective data set of analyses of volatile organic compounds (VOCs) in ground water of the United States. The data are from Federal, State, and local nonpoint-source monitoring programs, collected between 1985–95. This data set is being used to augment data...
Organic matter sources and rehabilitation of the Sacramento-San Joaquin Delta (California, USA)
A.D. Jassby, James E. Cloern
2000, Aquatic Conservation: Marine and Freshwater Ecosystems (10) 323-352
1. The Sacramento San Joaquin River Delta, a complex mosaic of tidal freshwater habitats in California, is the focus of a major ecosystem rehabilitation effort because of significant long-term changes in critical ecosystem functions. One of these functions is the production, transport and transformation of organic matter that constitutes the...
Woody riparian vegetation response to different alluvial water table regimes
P.B. Shafroth, J.C. Stromberg, D.T. Patten
2000, Western North American Naturalist (60) 66-76
Woody riparian vegetation in western North American riparian ecosystems is commonly dependent on alluvial groundwater. Various natural and anthropogenic mechanisms can cause groundwater declines that stress riparian vegetation, but little quantitative information exists on the nature of plant response to different magnitudes, rates, and durations of groundwater decline. We observed...
Isotope evidence of paleo-El Niño-Southern Oscillation cycles in loess-paleosol record in the central United States
Hongfang Wang, L.R. Follmer, Liu J. Chao-li J.
2000, Geology (28) 771-774
The δ13C of soil carbonate in rhizoconcretions collected from a loess-paleosol sequence in the central United States indicates that growing-season C3/C4 plant ratio oscillated by 35% on a 900 ± 200 yr time scale during the late Wisconsinan glaciation. The pattern appears in phase with advance and retreat of the southern...
An approach for assessment of water quality using semipermeable membrane devices (SPMDs) and bioindicator tests
J. D. Petty, S.B. Jones, J.N. Huckins, W.L. Cranor, J.T. Parris, T.B. McTague, T.P. Boyle
2000, Chemosphere (41) 311-321
As an integral part of our continued development of water quality assessment approaches, we combined integrative sampling, instrumental analysis of widely occurring anthropogenic contaminants, and the application of a suite of bioindicator tests as a specific part of a broader survey of ecological conditions, species diversity, and habitat quality in...
Solid-solution solubilities and thermodynamics: Sulfates, carbonates and halides
P. Glynn
2000, Reviews in Mineralogy and Geochemistry (40) 480-511
[No abstract available]...
Coyote, Canis latrans, use of commercial sunflower, Helianthus spp., Seeds as a food source in western Kansas
M.A. Sovada, D.J. Telesco, C.C. Roy
2000, Canadian Field-Naturalist (114) 697-699
Food habits of Coyotes (Canis latrans) were determined by analysis of scats collected in western Kansas in 1996. Mammals were the most frequently occurring food of Coyotes (100% of scats), followed by plants (39%), insects (30%) and birds (9%). Commercial sunflower (Helianthus spp.) seeds were found in 9 of 23...
