Reflexions on Frasnian and Famennian stage boundary decisions as a guide to future deliberations
W. Ziegler, Charles Sandberg
1995, Newsletters on Stratigraphy (33) 157-180
The pros and cons of the three conodont-based boundaries of the Frasnian and Famennian Stages and their corresponding GSSPs (Global Stratotype Section and Point) are evaluated in terms of current taxonomic, biostratigraphic, and sedimentologic knowledge. Two of these boundaries are based on easily identified pelagic species, which provide excellent bases...
Dust deposition in southern Nevada and California, 1984–1989: Relations to climate, source area, and source lithology
Marith C. Reheis, Rolf Kihl
1995, Journal of Geophysical Research D: Atmospheres (100) 8893-8918
Dust samples collected annually for 5 years from 55 sites in southern Nevada and California provide the first regional source of information on modern rates of dust deposition, grain size, and mineralogical and chemical composition relative to climate and to type and lithology of dust source. The...
Crustal geophysics gives insight into new madrid seismic zone
T.G. Hildenbrand, Eugene S. Schweig, Rufus D. Catchings, Victoria E. Langenheim, Walter D. Mooney, Thomas L. Pratt, W. D. Stanley
1995, Eos, Transactions, American Geophysical Union (76) 65-72
No abstract available....
Influence of static stress changes on earthquake locations in southern California
R.A. Harris, R.W. Simpson, P.A. Reasenberg
1995, Nature (375) 221-224
Earthquakes induce changes in static stress on neighbouring faults that may delay, hasten or even trigger subsequent earthquakes1–10. The length of time over which such effects persist has a bearing on the potential contribution of stress analyses to earthquake hazard assessment, but is presently unknown. Here we use an elastic...
The making of metal deposits
Randolph A. Koski
1995, Nature (377) 679-680
No abstract available....
Seismic evidence for an earthquake nucleation phase
W.L. Ellsworth, G. C. Beroza
1995, Science (268) 851-855
Near-source observations show that earthquakes initiate with a distinctive seismic nucleation phase that is characterized by a low rate of moment release relative to the rest of the event. This phase was observed for the 30 earthquakes having moment magnitudes 2.6 to 8.1, and the size and duration of this...
The biogeochemistry of wetlands in the San Luis Valley, Colorado: The effects of acid drainage from natural and mine sources
Larry P. Gough, Laurie S. Balistrieri, F.E. Lichte, T.M. Yanosky, Ronald C. Severson, A.S. Archuleta
1995, Report
The Summitville Mine, located near the old mining town of Summitville in Rio Grande County, Colorado, operated between July 1986 and December 1992 as a large-tonnage open-pit heap-leach gold mine. During its 6 years of existence the trace metal levels in drainage water from the mine site were elevated over...
Ostracode δ18O and δ13C evidence of Holocene environmental changes in the sediments of two Minnesota lakes
A. Schwalb, Sharon M. Locke, Walter E. Dean
1995, Journal of Paleolimnology (14) 281-296
Stable oxygen and carbon isotope geochemistry of ostracode valves, abundance and assemblages of ostracode species, and sedimentological parameters from cores taken in Williams and Shingobee Lakes in north-central Minnesota show changes in climatic and hydrologic history during the Holocene. Isotopic records are consistent with the following scenario:Before 9800 yr B.P....
A 12 000 year radiocarbon date of deglaciation from the Continental Divide of northwestern Montana
Paul E. Carrara
1995, Canadian Journal of Earth Sciences (32) 1303-1307
During the Pinedale (Late Wisconsinan) glaciation, an outlet glacier from a mountain ice field flowed eastward across the Continental Divide through Marias Pass in northwestern Montana. This outlet glacier was the major source of the Two Medicine glacier, a large piedmont glacier that extended from the mountain front east about...
Responses of bluegills and black crappies to dissolved oxygen, temperature, and current in backwater lakes of the upper Mississippi River during winter
B.C. Knights, Barry L. Johnson, M.B. Sandheinrich
1995, North American Journal of Fisheries Management (15) 390-399
We conducted a radiotelemetry study to examine the effects of dissolved oxygen (DO), water temperature, and current velocity on winter habitat selection by bluegills Lepomis macrochirus and black crappies Pomoxis nigromaculatus in the Finger Lakes backwater complex, Pool 5, on the upper Mississippi River. When DO was above 2 mg/L, both species selected areas...
Continental roots go with the flow
Walter D. Mooney
1995, Nature (375)
No abstract available....
Transport of agricultural chemicals to ground water, Princeton, Minnesota, 1991-93
G. N. Delin
1995, Conference Paper, Clean Water - Clean Environment - 21st Century
No abstract available....
Comparison of condition indices in migratory passerines at a stopover site in coastal Louisiana
Terry J. Spengler, P.L. Leberg, Wylie C. Barrow Jr.
1995, Condor (97) 438-444
We evaluated the utility of four nondestructive condition indices—body mass, body mass scaled by wing chord length, fat scoring, and total body electrical conductivity method (TOBEC)—as predictors of lipid levels in migrating Wood Thrushes (Hylocichla mustelina), Swainson's Thrushes (Catharus ustulatus), and Summer Tanagers (Piranga rubra). The Red-winged Blackbird (Agelaius phoeniceus),...
Contaminants and sea ducks in Alaska and the circumpolar region
Charles Henny, Deborah D. Rudis, Thomas J. Roffe, Everett Robinson-Wilson
1995, Environmental Health Perspectives (103) 41-49
We review nesting sea duck population declines in Alaska during recent decades and explore the possibility that contaminants may be implicated. Aerial surveys of the surf scoter (Melanitta perspicillata), white-winged scoter (M. fusca), black scoter (M. nigra), oldsqaw (Clangula hyemalis), spectacled eider (Somateria fischeri), and Steller's eider (Polysticta stellei) show...
Bald eagles kleptoparasitizing sea otters at Amchitka Island, Alaska
Jon Watt, Bernhard Krausse, M. Tim Tinker
1995, Condor (97) 588-590
No abstract available....
Preliminary geologic map of the Calabasas 7.5' quadrangle, southern California: A digital database
R. F. Yerkes, R. H. Campbell
1995, Open-File Report 95-51
This Open-File report is a digital geologic map database. This pamphlet serves to introduce and describe the digital data. There is no paper map included in the Open-File report. This digital map database is compiled from previously published sources combined with some new mapping and modifications in nomenclature. The geologic...
Mortality estimates of striped bass caught in Albemarle Sound and Roanoke River, North Carolina
Robert Dorazio
1995, North American Journal of Fisheries Management (15) 290-299
A statistical analysis of the age composition of striped bass Morone saxatilis harvested in Albemarle Sound and the Roanoke River, North Carolina. indicated that in 1988–1992 the population experienced a relatively high rate of total mortality. Age‐3 and older fish were estimated to have been fully vulnerable to fishing mortality and to...
Development of toxic equivalency factors for PCB congeners and the assessment of TCDD and PCB mixtures in rainbow trout
John L. Newsted, Paul D. Jones, John P. Giesy, Robert A. Crawford, Gerald T. Ankley, Donald E. Tillitt, Jay W. Gooch, Michael S. Denison
1995, Environmental Toxicology and Chemistry (14) 861-871
This study was undertaken to evaluate the relationship between mammalian and piscine 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) toxic equivalency factors (TEFs) for PCBs, based on induction of CYP1A enzyme activity, catalytic protein, and mRNA. Rainbow trout administered a single i.p. injection of TCDD had an average (±SD) ED50 of 0.91 ± 0.14 μg...
Aerial infrared surveys in the investigation of geothermal and volcanic heat sources
Water Resources Division, U.S. Geological Survey
1995, Fact Sheet 079-95
This factsheet briefly summarizes and clarifies the application of aerial infrared surveys in geophysical exploration for geothermal energy sources and environmental monitoring for potential volcanic hazards....
Floods in southeast Texas, October 1994
Fred Liscum, Jeffery W. East
1995, Fact Sheet 073-94
Rainfall in southeast Texas, which ranged in amounts from about 8 to more than 28 inches during October 15–19, 1994, caused severe flooding in parts of a 38-county area. A combination of meteorological events—residual atmospheric moisture over southern Texas associated with Hurricane Rosa from the Pacific Coast of Mexico and...
National Water-Quality Assessment Program— Pesticides in the Trinity River Basin study unit, Texas, 1968-91
R.L. Ulery
1995, Fact Sheet 088-95
The Trinity River Basin National Water Quality Assessment (NAWQA) study-unit staff began assessment activities in 1991, and in 1992, undertook a retrospective review of existing data on pesticides. The main purpose of this review was to aid in the design of a pesticide-sampling network for the study unit. The review...
United States Geological Survey : programs in Alabama
Water Resources Division, U.S. Geological Survey
1995, Fact Sheet 002-95
Isotopic geochronology of the Leadville 1° x 2° quadrangle, west-central Colorado; summary and discussion
Alan R. Wallace
1995, Bulletin 2104
No abstract available....
Bibliography of USGS marine organic geochemistry; 1976-1995
Keith A. Kvenvolden
1995, Open-File Report 95-41
Geologic map of the Clarksville South and Tungsten 7.5-minute quadrangles, Virginia and North Carolina
J. D. Peper, T. W. Clark, K. A. Kanahele
1995, Open-File Report 94-629
No abstract available....
