Application of 2-D travel-time inversion of seismic refraction data to the mid-continent rift beneath Lake Superior
William J. Lutter, Anne M. Trehu, Robert L. Nowack
1993, Geophysical Research Letters (20) 615-618
The inversion technique of Nowack and Lutter (1988a) and Lutter et al. (1990) has been applied to first arrival seismic refraction data collected along Line A of the 1986 Lake Superior GLIMPCE experiment, permitting comparison of the inversion image with an independently derived forward model (Trehu et al., 1991; Shay...
Sensitivity of the U.S. Fish and Wildlife Service's stream network temperature model
J. M. Bartholow
1993, Book, Proceedings of the Thirteenth Annual American Geophysical Union Hydrology Days
No abstract available....
Proceedings of the fourth conference on research in California's National Parks
Stephen D. Veirs Jr., Thomas Stohlgren, Christine Schonewald-Cox
1993, Report
The papers in this proceedings were selected from the 63 presentations given at the Fourth Biennial Conference on Research in National Parks in California. The overall theme for this meeting was a recurring one: “The Integration of Research into National Park Service Resource Management Decisions.” The conference was held at...
Edge-driven microplate kinematics
Hans Schouten, Kim D. Klitgord, David G. Gallo
1993, Journal of Geophysical Research B: Solid Earth (98) 6689-6701
It is known from plate tectonic reconstructions that oceanic microplates undergo rapid rotation about a vertical axis and that the instantaneous rotation axes describing the microplate's motion relative to the bounding major plates are frequently located close to its margins with those plates, close to the tips of propagating rifts....
Wetland modeling and information needs at Stillwater National Wildlife Refuge
David B. Hamilton, Gregor T. Auble
1993, Report, Results of a workshop sponsored by Division on Wildlife Refuges and Wildlife, Region 1
The marshes in and around Stillwater National Wildlife Refuge (the Refuge) are extremely dynamic; expanding and contracting in size both seasonally, due to runoff and subsequent evapotranspiration, and over longer periods, due to climatic variation. The dynamic nature of these marshes results in a diversity of wetland habitats, which...
Microfaunal evidence for elevated Pliocene temperatures in the Arctic Ocean
Thomas M. Cronin, Robin Whatley, Adrian Wood, Akira Tsukagoshi, Noriyuki Ikeya, Elisabeth M. Brouwers, W. M. Briggs Jr.
1993, Paleoceanography and Paleoclimatology (8) 161-173
The migration of thermophilic marine Ostracoda into the Arctic Ocean during the Pliocene indicates that winter and summer ocean temperatures around Arctic margins were ≥ 0 °C and > 3 °C, respectively, and that ice-free conditions existed for most or all of the Arctic. By at least 3.5–3.0 Ma, probably...
Earthquake prediction lessons from Parkfield Experiment
Andrew J. Michael, John O. Langbein
1993, Eos Science News (74) 145-155
In 1985, the National Earthquake Prediction Evaluation Council (NEPEC), and later its California counterpart (CEPEC), approved an earthquake prediction for the first time. This was the Bakun and Lindh [1985] forecast, with 95% confidence, that an M = 5.5 to 6 earthquake would rupture along the San Andreas fault near the town...
Interactive coupling of a lake thermal model with a regional climate model
Steven W. Hostetler, G. T. Bates, F. Giorgi
1993, Journal of Geophysical Research-Atmospheres (98) 5045-5057
A one‐dimensional model of lake temperature, evaporation, and ice has been coupled in an interactive mode with the climate version of the National Center for Atmospheric Research/Pennsylvania State University regional (mesoscale) atmospheric model (MM4). The coupled MM4‐lake model makes possible high‐resolution simulations of climate in the proximity of large water...
Streamflow and sediment dynamics of the Middle Rio Grande Valley, New Mexico, in the context of cottonwood recruitment
Robert T. Milhous, Mark Wondzell, Amy Ritter
1993, Report
The cottonwood gallery forests of the Middle Rio Grande floodplain in New Mexico provide important habitats for birds and other animals. Over the last century, these forests have changed significantly due to invasion of exotics such as salt cedar and Russian olive, which compete with native cottonwoods, and changes...
Radium isotope geochemistry of thermal waters, Yellowstone National Park, Wyoming, USA
N.C. Sturchio, John K. Bohlke
1993, Geochimica et Cosmochimica Acta (57) 1203-1214
Radium isotope activities (226Ra, 228Ra, and 224Ra), chemical compositions, and sulfur isotope ratios in sulfate were determined for water samples from thermal areas in Yellowstone National Park, Wyoming. Activities of 226Ra in these waters range from <0.2 to 37.9 dpm/kg. Activity ratios of 228Ra226Ra">228Ra226Ra range from 0.26 to 14.2,...
A methodology for quantifying and valuing the impacts of flow changes on a fishery
David A. Harpman, Edward W. Sparling, Terry J. Waddle
1993, Water Resources Research (29) 575-582
A quasi-population model for adult brown trout was developed for the Taylor River below the Taylor Park Reservoir in Colorado. This model allows the population to be predicted under alternative flow management regimes. The predicted population effects of two different flow release patterns were compared with the predicted...
Polyphosphate present in DNA preparations from fungal species of Collectotrichum inhibits restriction endonucleases and other enzymes
R. J. Rodriguez
1993, Analytical Biochemistry (209) 291-297
During the development of a procedure for the isolation of total genomic DNA from filamentous fungi (Rodriguez, R. J., and Yoder, 0. C., Exp. Mycol. 15, 232-242, 1991) a cell fraction was isolated which inhibited the digestion of DNA by restriction enzymes. After elimination of DNA, RNA, proteins, and lipids,...
The global carbon dioxide budget
E.T. Sundquist
1993, Science (259) 934-941
The increase in atmospheric CO2 levels during the last deglaciation was comparable in magnitude to the recent historical increase. However, global CO2 budgets for these changes reflect fundamental differences in rates and in sources and sinks. The modern oceans are a rapid net CO2 sink, whereas the oceans were a gradual source during...
Meteorology of the storm of November 3-5, 1985, in West Virginia and Virginia: Chapter B in Geomorphic studies of the storm and flood of November 3-5, 1985, in the upper Potomac and Cheat River basins in West Virginia and Virginia
Stephen J. Colucci, Robert B. Jacobson, Steven Greco
1993, Bulletin 1981-B
The storm of November 3-5, 1985, in the central Appalachian Mountains of West Virginia and Virginia resulted from a complex sequence of meteorological events. The stage was set by Hurricane Juan, which made landfall in the Gulf Coast on October 31. Juan brought moisture northward up the Mississippi Valley; latent...
Comparison of the petrography, palynology and paleobotany of the Stockton coal bed, West Virginia and implications for paleoenvironmental interpretations
Brenda Pierce, R.W. Stanton, Cortland F. Eble
1993, Organic Geochemistry (20) 149-166
The Stockton coal bed (Middle Pennsylvanian) is a relatively high ash coal composed primarily of moderately thin banded, sparsely thin banded, and nonbanded coal (splint and cannel coal). Comparisons of petrographic, palynologic, and paleobotanic data gathered from the same sample sets from a single column of the Stockton coal bed...
Fire history of southeastern Glacier National Park: Missouri River Drainage
Stephen W. Barrett
1993, Report
In 1982, Glacier National Park (GNP) initiated long-term studies to document the fire history of all forested lands in the 410,000 ha. park. To date, studies have been conducted for GNP west of the Continental Divide (Barrett et al. 1991), roughly half of the total park area. These...
Fluvial response to late Quaternary climatic fluctuations, central Kobuk Valley, northwestern Alaska
G.M. Ashley, T. D. Hamilton
1993, Journal of Sedimentary Research (63) 814-827
Much of northwestern Alaska remained unglaciated during the Pleistocene and thus offers a favorable setting for examining long-term records of high-latitude geological and biological change. Epiguruk, a large cut bank 3.5 km long and up to 36 m high on the Kobuk River south of the Brooks Range in eastern...
Stable carbon and oxygen isotope studies of the sediments of Elk Lake, Minnesota
Walter E. Dean, Minze Stuiver
1993, GSA Special Papers (276) 163-180
Variations in the ratios of 18O:16O and 13C:12C in calcite throughout the Holocene in Elk Lake, Minnesota, are recorded in three varve-calibrated carbonate cores. Marl in a varved deep-basin (29.6 m) core consists mainly of calcite precipitated from surface waters during the summer and probably provides the least complicated isotope record. Marl...
Modern sedimentation in Elk Lake, Clearwater County, Minnesota
E.B. Nuhfer, R.Y. Anderson, J. Platt Bradbury, Walter E. Dean
1993, GSA Special Papers (276) 96
The varved sediments of Elk Lake, Clearwater County, Minnesota, contain a 10,000 year record of climatic and limnologic events. Sediment traps deployed in the lake’s water column from 1979 to 1981 and from 1983 to 1984 collected samples that permitted us to identify materials, to see the timing of sedimentation...
Geochemistry of surface sediments of Minnesota lakes
Walter E. Dean, Eville Gorham, Dalway J. Swaine
1993, GSA Special Papers (276) 115-133
Analyses of 36 trace, minor, and major elements were used to classify the sediments of 46 Minnesota lakes. Q-mode factor analyses grouped Minnesota lake sediments according to clastic-, carbonate-, organic-, and redox-related elements. Carbonate lakes occur in west-central Minnesota; their sediments have relatively high concentrations of CaCO3, Ba, and Sr....
Elk Lake in perspective
R.Y. Anderson, Walter E. Dean, J. Platt Bradbury
1993, GSA Special Papers (276) 1-6
Elk Lake is located in the forested region of north-central Minnesota at the headwaters of the Mississippi River and occupies one of countless basins left behind as the last great Pleistocene ice sheet retreated northward into Canada. In this respect it resembles many other moderately deep, dimictic, hard-water lakes in...
Physical properties, mineralogy, and geochemistry of Holocene varved sediments from Elk Lake, Minnesota
Walter E. Dean
1993, GSA Special Papers (276) 135-157
Elk Lake in northwestern Minnesota is situated close to a climatically sensitive ecotone, the forest-prairie border, that migrated back and forth over the drainage basin of the lake during the Holocene. The entire postglacial (Holocene) sediment record in the deepest part of Elk Lake is composed of annual layers (varves)...
40Ar/39Ar thermochronology and Alleghanian development of the southernmost Appalachian Piedmont, Alabama and southwest Georgia
Mark G. Steltenpohl, Michael J. Kunk
1993, GSA Bulletin (105) 819-833
40Ar/39Ar age spectra of hornblende, muscovite, and microcline, and total fusion ages of biotite from metamorphic rocks of the Inner Piedmont, Pine Mountain, and Uchee belts are reported. Mineral cooling ages from the eastern part of the Inner Piedmont are as follows: hornblende, 320 Ma; muscovite, 296 Ma; biotite, 293...
Application and testing of a procedure to evaluate transferability of habitat suitability criteria
Jeff A. Thomas, Ken D. Bovee
1993, Regulated Rivers: Research & Management (8) 285-294
A procedure designed to test the transferability of habitat suitability criteria was evaluated in the Cache la Poudre River, Colorado. Habitat suitability criteria were developed for active adult and juvenile rainbow trout in the South Platte River, Colorado. These criteria were tested by comparing microhabitat use predicted from the criteria...
A salmonid population model with emphasis on habitat limitations
John M. Bartholow, J. L. Laake, Clair B. Stalnaker, Sam Williamson
1993, Rivers (4) 265-279
No abstract available....
