Flood dependency of cottonwood establishment along the Missouri River, Montana, USA
Michael L. Scott, Gregor T. Auble, Jonathan M. Friedman
1997, Ecological Applications (7) 677-690
Flow variability plays a central role in structuring the physical environment of riverine ecosystems. However, natural variability in flows along many rivers has been modified by water management activities. We quantified the relationship between flow and establishment of the dominant tree (plains cottonwood, Populus deltoides subsp. monilifera) along one of the least hydrologically...
Geomorphic influences on the distribution of Yellowstone cutthroat trout in the Absaroka Mountains, Wyoming
C.G. Kruse, W.A. Hubert, F.J. Rahel
1997, Transactions of the American Fisheries Society (126) 418-427
Influences of large‐scale abiotic, geomorphic characteristics on distributions of Yellowstone cutthroat trout Oncorhynchus clarki bouvieri are poorly understood. We sampled 151 sites on 56 perennial streams in the Greybull–Wood river drainage in northwestern Wyoming to determine the effects of geomorphic variables on Yellowstone cutthroat trout distributions. Channel slope, elevation,...
Conditions for the return and simulation of the recovery of burrowing mayflies in western Lake Erie
Cynthia S. Kolar, Patrick L. Hudson, Jacqueline F. Savino
1997, Ecological Applications (7) 665-676
In the 1950s, burrowing mayflies, Hexagenia spp. (H. limbata and H. rigida), were virtually eliminated from the western basin of Lake Erie (a 3300 km2 area) because of eutrophication and pollution. We develop and present a deterministic model for the recolonization of the western basin by Hexagenia to pre-1953 densities. The model was based on the logistic...
Water-level changes in response to the 20 December 1994 earthquake near Parkfield, California
Eddie Quilty, Evelyn A. Roeloffs
1997, Bulletin of Seismological Society of America (87) 310-317
We analyze co-seismic changes of water level in nine wells near Parkfield, California, produced by an MD 4.7 earthquake on 20 December 1994 in order to test the hypothesis that co-seismic water-level changes are proportional to co-seismic volumetric strain. For each well, a quantitative relationship between water level and volumetric strain can...
Triassic plutonism in southern California: Southward younging of arc initiation along a truncated continental margin
A. P. Barth, R. M. Tosdal, J. L. Wooden, K. A. Howard
1997, Tectonics (16) 290-304
Earliest Cordilleran magmatism in the southwestern United States is recorded by a belt of Triassic plutons that intrude Proterozoic basement of the Mojave crustal province and its cratonal/miogeoclinal cover. The belt extends from the western Mojave Desert through the Transverse Ranges to the Colorado River trough. Triassic plutons are predominantly...
Review of two visual programming languages for simulation modeling
Jacoby Carter
1997, SWS Bulletin (14) 38-39
No abstract available....
Application of the Modern Analog Technique (MAT) of sea surface temperature estimation to middle Pliocene North Pacific planktonic foraminifer assemblages
Harry J. Dowsett, Marci M. Robinson
1997, Palaeontologia Electronica 1-22
Seventy-two samples from Deep Sea Drilling Project Sites 445 and 463 and Ocean Drilling Program Site 769 from the northwest Pacific Ocean were compared to 499 modern core top Pacific Ocean samples using the squared chord distance dissimilarity measure. Many samples show high levels of dissimilarity that can be explained...
Estimating temporary emigration using capture-recapture data with Pollock's robust design
W. L. Kendall, James D. Nichols, James E. Hines
1997, Ecology (78) 563-578
Statistical inference for capture–recapture studies of open animal populations typically relies on the assumption that all emigration from the studied population is permanent. However, there are many instances in which this assumption is unlikely to be met. We define two general models for the process of temporary emigration: completely random...
Classification of mineral deposits into types using mineralogy with a probabilistic neural network
Donald A. Singer, Ryoichi Kouda
1997, Nonrenewable Resources (6) 27-32
In order to determine whether it is desirable to quantify mineral-deposit models further, a test of the ability of a probabilistic neural network to classify deposits into types based on mineralogy was conducted. Presence or absence of ore and alteration mineralogy in well-typed deposits were used to train the network....
Constraints on establishment of plains cottonwood in an urban riparian preserve
G.T. Auble, M. L. Scott, Jonathan M. Friedman, J. Back, V.J. Lee
1997, Wetlands (17) 138-148
Plot sampling and hydraulic modeling were combined to investigate establishment and survival of plains cottonwood along Boulder Creek, an urban stream on the Colorado Plains. We tested the hypothesis that establishment is limited to bare, moist surfaces produced by spring flooding in the current year. No cottonwood germination was observed...
Selection of the Mars Pathfinder landing site
M. P. Golombek, R. A. Cook, H. J. Moore, Thomas J. Parker
1997, Journal of Geophysical Research Planets (102) 3967-3988
The Mars Pathfinder spacecraft will land on a depositional fan near the mouth of the catastrophic outflow channel, Ares Vallis (19.5°N, 32.8°W). This site offers the prospect of analyzing a variety of rock types from the ancient cratered highlands, intermediate-age ridged plains, and reworked channel deposits. Analyses of these rocks...
Land cover characterization and land surface parameterization research
Louis T. Steyaert, Thomas R. Loveland, William J. Parton
1997, Ecological Applications (7) 1-2
The understanding of land surface processes and their parameterization in atmospheric, hydrologic, and ecosystem models has been a dominant research theme over the past decade. For example, many studies have demonstrated the key role of land cover characteristics as controlling factors in determining land surface processes, such as the exchange...
Combining digital spatial data with hydrologic measurements to interpret controls of stream chemistry in large watersheds
Yvonne H. Baevsky, Gregory B. Lawrence, David M. Wolock, Douglas A. Burns, Peter S. Murdoch
1997, Conference Paper, BIOGEOMON '97 journal of conference abstracts
No abstract available....
Relation of the lower Pennsylvanian unconformity to a mid-carboniferous eustatic event in the eastern United States
K. J. Englund, R. E. Thomas
1997, Prace - Panstwowego Instytutu Geologicznego 170-172
Two contrasting concepts specifying the age and duration of the hiatus resulting from a mid-Carboniferous eustatic event in the eastern United States are based on different evidence. The original model indicated that the hiatus is at an unconformity in cratonic areas that was assumed to coincide with the Mississippian-Pennsylvanian boundary...
Deep regional resistivity structure across the Carlin Trend
Brian D. Rodriguez
Peter Vikre, Tommy B. Thompson, K. H. Bettles, Odin Christensen, Ron Parratt, editor(s)
1997, Book chapter, Carlin-type gold deposits field conference
The genesis of gold deposits along the Carlin trend is not fully understood. Many of the significant mineral deposits in the Carlin trend were formed during the Tertiary as a result of interrelated high-angle basin-and-range faulting, intrusive igneous activity, and hydrothermal processes (Radtke, 1985). According to Shawe (1991), the linearity...
Age and correlation of tephra layers, position of the Matuyama-Brunhes chron boundary, and effects of Bishop Ash eruption on Owens Lake, as determined from drill hole OL-92, Southeast California
Andrei M. Sarna-Wojcicki, Charles E. Meyer, Elmira Wan
1997, Book chapter, An 800,000-year paleoclimatic record from core OL-92, Owens Lake, Southeast California
Tephra layers in the ~323-m-deep Owens lake drill hole OL-92 correlate to tephra layers that have been identified and dated elsewhere in the western United States. Tephra layers identified are the Bishop ash bed (758 ka) at 309.2–298.6 m; the Dibekulewe (ash) bed (ca. 470 ka to ca. 610 ka)...
Synthesis of the paleoclimatic record from Owens Lake core OL-92
George I. Smith, James L. Bischoff, J. Platt Bradbury
1997, Book chapter, An 800,000-year paleoclimatic record from core OL-92, Owens Lake, Southeast California
During much of the late Quaternary, Owens Lake overflowed into one or more of four successively lower-elevation basins. Most of the water came from the high, eastern slopes of the southern Sierra Nevada, and changes in the volumes of that water reflect a dominant climatic cycle of ~100 k.y. Variations...
An 800,000-year pollen record from Owens Lake, California: Preliminary analyses
Ronald J. Litwin, D.P. Adam, N. O. Frederiksen, W. B. Woolfenden
1997, Book chapter, An 800,000-year paleoclimatic record from core OL-92, Owens Lake, Southeast California
A long sequence of fossil palynomorph assemblages from a 323-m-long core taken at Owens Lake has enabled us to evaluate the gross vegetational trends for the Owens Valley region of California over the past ~800,000 years. Shifts in vegetation composition and abundance in the study area during the Pleistocene were...
Some comparisons between recent ground-motion relations
Gail M. Atkinson, David Boore
1997, Seismological Research Letters (68) 24-40
We provide an overview of new ground-motion relations for eastern North America (ENA) developed over the last five years. The empirical-stochastic relations of Atkinson and Boore (1995) are compared to relations developed by the Electric Power Research Institute (EPRI, 1993; also Toro et al., 1994), Frankel et al. (1996), and the consensus ENA...
Structural underpinnings and neotectonics of the southern Illinois Basin: An overview
Dennis R. Kolata, T.G. Hildenbrand
1997, Seismological Research Letters (68) 499-510
The southern end of the Illinois Basin is one of the most structurally complex regions in the Midcontinent United States. Two major structural elements characterize this part of the basin: (1) A broad southwestward-plunging cratonic depression extends across central Illinois and southwestern Indiana. Investigations of historical and prehistorical earthquakes in...
Broad-scale climatic influences on rainfall thresholds for debris flows: Adapting thresholds for northern California to southern California
Raymond C. Wilson
Robert A. Larson, James E. Slosson, editor(s)
1997, Book chapter, Storm-induced geologic hazards
A Landslide Warning System (LWS) operated in the San Francisco Bay region until late 1995. The LWS issued public advisories when rainfall conditions reached or approached critical levels for triggering debris flows ("mudslides"). Interest in an LWS for southern California was revived by the destructive landslides triggered by the storms...
Geochemical processes controlling uranium mobility in mine drainages
Richard B. Wanty, W. R. Miller, P. H. Briggs, J. B. McHugh
1997, Book chapter, The environmental geochemistry of mineral deposits: Part A: Processes, techniques, and health issues Part B: Case studies and research topics
Comprehensive models of ore genesis incorporate metal sources, transport and concentration mechanisms, and preservation mechanisms. Analogous concepts apply to the problem of metal migration from mines, mine wastes, and mine tailings, including: the concentrations, mineralogical occurrence, and availability of metals in mineral deposits, host rocks, mine wastes, and tailings (the...
Operation of a landslide warning system during the California storm sequence of January and February 1993
Raymond C. Wilson
Robert A. Larson, James E. Slosson, editor(s)
1997, Book chapter, Storm-induced geologic hazards
From 1986 to late December 1995, the U.S. Geological Survey and the National Weather Service operated a landslide warning system for debris flows triggered by intense rainstorms in the San Francisco Bay region. The Landslide Warning System tracked storm systems as they approached the region, determined actual rainfall with a...
Responses of sediment geochemistry to climate change in Owens Lake sediment: An 800-k.y. record of saline/fresh cycles in core OL-92
James L. Bischoff, Jeffrey P. Fitts, John A. Fitzpatrick
1997, Book chapter, An 800,000-year paleoclimatic record from core OL-92, Owens Lake, Southeast California
Geochemical parameters of sediments from drill hole OL-92 indicate that Owens Lake was saline, alkaline, and highly productive during interglacial periods, and was hydrologically open and relatively unproductive during glacial periods. Abundance of CaCO3, organic carbon, and cation-exchange capacity of the clay fraction show cyclic variation down the core. Six...
Core OL-92 from Owens Lake: Project rationale, geologic setting, drilling procedures, and summary
George I. Smith, James L. Bischoff
1997, Book chapter, An 800,000-year paleoclimatic record from core OL-92, Owens Lake, Southeast California
Several lines of evidence indicated that Owens Lake, a now-dry lake in southeast California, would probably yield a continuous and climatically informative sedimentary record. Also, the details of modern climate and runoff in the area are exceptionally well known, providing a firm basis for interpreting various types of evidence from...
