Upper Pleistocene turbidite sand beds and chaotic silt beds in the channelized, distal, outer-fan lobes of the Mississippi fan
C.H. Nelson, D.C. Twichell, W. C. Schwab, H.J. Lee, Neil H. Kenyon
1992, Geology (20) 693-696
Cores from a Mississippi outer-fan depositional lobe demonstrate that sublobes at the distal edge contain a complex local network of channelized-turbidite beds of graded sand and debris-flow beds of chaotic silt. Off-lobe basin plains lack siliciclastic coarse-grained beds. The basin-plain mud facies exhibit low acoustic backscatter on SeaMARC IA sidescan...
Laboratory methods
F.G. Ethridge, W.R. Almon, M.P. Cone, D.G. Kersey, H.A. Ohen, W.A. Nagel, K.A. Byerly, Jim Funk, C.L. Vayra, J.G. Kaldi, R.M. Sneider, J.T. Hawkins, R. W. Scott, D.W. Houseknecht, J.B. Thomas, P.C. Henshaw, R.L. Kaufman, L.W. Slentz, P.A. Dickey, Dare Keelan, J.O. Amaefule
1992, Book chapter, Development geology reference manual
No abstract available ...
Mixed-mode isolation of triazine metabolites from soil and aquifer sediments using automated solid-phase extraction
M. S. Mills, E.M. Thurman
1992, Analytical Chemistry (64) 1985-1990
No abstract available. ...
Determination of hatching date for eggs of black-crowned night-herons, snowy egrets and great egrets
T. W. Custer, G.W. Pendleton, R.W. Roach
1992, Journal of Field Ornithology (63) 145-154
Floatation of eggs in water and specific gravity of eggs of Black-crowned Night-Herons (Nycticorax nycticorax ), Snowy Egrets (Egretta thula ) and Great Egrets (Casmerodius albus ) were evaluated as methods to determine date of hatching. Although specific gravity was a better predictor of hatching date than egg...
Transfer of computer software technology through workshops: The case of fish bioenergetics modeling
Barry L. Johnson
1992, Fisheries (17) 114-118
I recommend a three-part program to promote the availability and use of computer software packages to fishery managers and researchers. The three-part approach consists of journal articles that announce new technologies, technical reports that serve as user's guides, and hands-on workshops that provide direct instruction to new users. Workshops, which...
Semiempirical model of soil water hysteresis
J. R. Nimmo
1992, Soil Science Society of America Journal (56) 1723-1730
In order to represent hysteretic soil water retention curves accurately using as few measurements as possible, a new semiempirical model has been developed. It has two postulates related to physical characteristics of the medium, and two parameters, each with a definite physical interpretation, whose values are determined empirically for a...
Sublethal effects of cadmium on physiological responses in the pocketbook mussel, Lampsilis ventricosa
T.J. Naimo, G.J. Atchison, L. E. Holland Bartels
1992, Environmental Toxicology and Chemistry (11) 1013-1021
Recent studies indicate that the density and diversity of freshwater mussels are declining in many large river systems, possibly from low-level chemical contamination. Exposure of Lam-psilis ventricosa (Barnes, 1823) to 0, 22, 111, and 305 μg/L of cadmium for 28 d in a proportional diluter resulted in a significant decrease (p ≤ 0.05)...
The cycling of iron and manganese in the water column of Lake Sammamish, Washington
Laurie S. Balistrieri, J.W. Murray, B. Paul
1992, Limnology and Oceanography (37) 510-528
Processes controlling the distribution and mobility of Fe and Mn in Lake Sammamish, Washington, a seasonally anoxic lake, are deduced from a year‐long monthly study of physical, chemical, and biological parameters in the lake. Inventories of dissolved Mn and Fe in the bottom waters increase as the...
A glacier peak and Mount Saint Helens J volcanic ash couplet and the timing of deglaciation in the Colville Valley area, Washington
P. E. Carrara, D.A. Trimble
1992, Canadian Journal of Earth Sciences (29) 2397-2405
A Late Pleistocene volcanic ash couplet consisting of a Glacier Peak ash layer and an underlying Mount Saint Helens J ash layer has been identified at three sites in the Colville Valley area of northeastern Washington. This ash couplet has been reported as far east as northwestern Montana and therefore...
The oldest known Rocky Mountain bristlecone pines (Pinus aristata Engelm.)
F.C. Brunstein, D.K. Yamaguchi
1992, Arctic and Alpine Research (24) 253-256
We have found 12 living Rocky Mountain bristlecone pines (Pinus aristata) more than 1600 yr old, including four that are more than 2100 yr old, on Black Mountain, near South Park, and on Almagre Mountain, in the southern Front Range, Colorado. A core from the oldest of these trees has...
Deep Sea Drilling Project Site 612 bolide event: New evidence of a late Eocene impact-wave deposit and a possible impact site, US east coast
W. Wei, C. Wylie Poag, Lawrence J. Poppe, David W. Folger, David S. Powars, Robert B. Mixon, Lucy E. Edwards, Scott Bruce
1992, Geology (20) 771-774
A remarkable >60-m-thick, upward-fining, polymictic, marine boulder bed is distributed over >15 000 km2 beneath Chesapeake Bay and the surrounding Middle Atlantic Coastal Plain and inner continental shelf. The wide varieties of clast lithologies and microfossil assemblages were derived from at least seven known Cretaceous, Paleocene, and Eocene stratigraphic units....
A monoclinic, pseudo-orthorhombic Au-Hg mineral of potential economic significance in Pleistocene Snake River alluvial deposits of southeastern Idaho
G. A. Desborough, E.E. Foord
1992, Canadian Mineralogist (30) 1033-1038
A mineral with the approximate composition of Au94Hg6 - Au88Hg12 (atomic %) has been identified in Pleistocene Snake River alluvial deposits. The gold-mercury mineral occurs as very small grains or as polycrystalline masses composed of subhedral to nearly euhedral attached crystals. Vibratory cold-polishing techniques with 0.05-??m alumina abrasive for polished...
Pesticides in Iowa precipitation
B.K. Nations, G.R. Hallberg
1992, Journal of Environmental Quality (21) 486-492
Rainfall was sampled for pesticides to assess their occurrence in precipitation and potential impacts on water resources. Three areas in Iowa were sampled; two localities were in rural settings, and a third in an urban area. Fourteen pesticides, including ten herbicides and four insecticides, were detected...
Computer simulation of dry layered granular flow down an incline composed of grains
Chi-Hai Ling, Chyan-Deng Jan
1992, Conference Paper, Proceedings of Engineering Mechanics
Experiments show that gravity-driven dry granular flows are essentially layered for smooth spheres. This paper describes layer-to-layer interaction in the flow. Assuming two-dimensional flow and neglecting the interaction of grains within the same layer, one may idealize the problem as an elastic sphere under external forces moving down an incline...
Metallogeny of the midcontinent rift system of North America
S. W. Nicholson, W.F. Cannon, K. J. Schulz
1992, Precambrian Research (58) 355-386
The 1.1 Ga Midcontinent rift system of North America is one of the world's major continental rifts and hosts a variety of mineral deposits. The rocks and mineral deposits of this 2000 km long rift are exposed only in the Lake Superior region. In the Lake Superior region, the...
Comparison of three newton-like nonlinear least-squares methods for estimating parameters of ground-water flow models
R.L. Cooley, M. C. Hill
1992, Conference Paper, Finite Elements in Water Resources, Proceedings of the International Conference
Three methods of solving nonlinear least-squares problems were compared for robustness and efficiency using a series of hypothetical and field problems. A modified Gauss-Newton/full Newton hybrid method (MGN/FN) and an analogous method for which part of the Hessian matrix was replaced by a quasi-Newton approximation (MGN/QN) solved some of the...
Late Pleistocene equilibrium-line reconstructions in the northern Peruvian Andes
D. T. Rodbell
1992, Boreas (21) 43-52
ELA reconstructions using the toe-to-headwall-altitude ratio method for paleoglaciers in the Cordilleras Blanca and Oriental, northern Peruvian Andes indicate that ELAs during the last glacial maximum (LGM; marine isotope stage 2)) were c.4300 m in the Cordillera Blanca, c.3900-3600 m on the west side of the Cordillera Oriental, and c.3200...
Thermal waters along the Konocti Bay fault zone, Lake County, California: a re-evaluation
J. M. Thompson, Robert H. Mariner, L. D. White, T. S. Presser, William C. Evans
1992, Journal of Volcanology and Geothermal Research (53) 167-183
The Konocti Bay fault zone (KBFZ), initially regarded by some as a promising target for liquid-dominated geothermal systems, has been a disappointment. At least five exploratory wells were drilled in the vicinity of the KBFZ, but none were successful. Although the Na-K-Ca and Na-Li geothermometers indicate that the thermal waters...
Hydraulic roughness of earth covers at a cold-desert waste burial site
B.F. Goff, G.C. Bent, G.E. Hart
1992, Arid Soil Research and Rehabilitation (6) 327-338
A kinematic wave model of overland flow was used to calculate hydraulic roughness coefficients for earth covers and native hillslope surfaces at a waste burial site. Manning's n roughness coefficients were greater on earth cover plots planted to crested wheatgrass (n = 0.076) than on those planted to streambank wheatgrass...
Stimulation of coho salmon growth by insulin-like growth factor I
S. D. McCormick, K.M. Kelley, G. Young, R. S. Nishioka, H. A. Bern
1992, General and Comparative Endocrinology (86) 398-406
The effect of insulin-like growth factor I on growth rate of coho salmon (Oncorhynchus kisutch) was examined. Juvenile coho salmon received implants of osmotic minipumps containing recombinant bovine insulin-like growth factor I (rbIGF-I) or saline for a period of 3 to 4 weeks. High doses of rbIGF-I (>0.13 μg ·...
Prevalence of lead exposure among age and sex cohorts of Canada geese
S. DeStefano, C. J. Brand, D. H. Rusch
1992, Canadian Journal of Zoology (70) 901-906
We examined the prevalence of lead exposure from ingestion of waste lead shot among age and sex cohorts of Canada geese (Branta canadensis) on the breeding, migration, and wintering grounds of the Eastern Prairie Population. Blood samples from 6963 geese were assayed for lead concentration by atomic absorption spectrophotometry. On...
Seasonal changes in the spatial distribution of phytoplankton in small, temperate-zone lakes
J. E. Cloern, A.E. Alpine, B.E. Cole, T. Heller
1992, Journal of Plankton Research (14) 1017-1024
Seasonal sampling across two small lakes shows that phytoplankton patchiness is greatly enhanced during winter ice-cover relative to the open-water seasons of exposure to wind stress and rapid turbulent mixing....
Comparison of purge and trap GC/MS and purgeable organic chloride analysis for monitoring volatile chlorinated hydrocarbons
Larry B. Barber, E. Michael Thurman, Yoshi Takahashi, Mary C. Noriega
1992, Ground Water (30) 836-842
A combined field and laboratory study was conducted to compare purge and trap gas chromatography/mass spectrometry (PT‐GC/MS) and purgeable organic chloride (POC1) analysis for measuring volatile chlorinated hydro‐carbons (VCH) in ground water. Distilled‐water spike and recovery experiments using 10 VCH indicate that at concentrations greater than...
Campanian ammonites from the Upper Cretaceous Gober Chalk of Lamar County, Texas
W. A. Cobban, W. J. Kennedy
1992, Journal of Paleontology (66) 440-454
The Roxton Limestone Member at the top of the Gober Chalk in northeast Texas yields a rich fauna, dominated by Baculites haresi Reeside, 1927, and Inoceramus balticus Boehm, 1909, with sparse occurrences of pachydiscus cf. P. paulsoni (Young, 1963), Anapachydiscus sp.juv., Placenticeras placenta (DeKay, 1828), Hoplitoplacenticeras aff. H. plasticum (Paulcke,...
Comparative gas exchange characteristics of potted, glasshouse-grown almond, apple, fig, grape, olive, peach and Asian pear
S. S. Higgins, F. E. Larsen, R. B. Bendel, G. K. Radamaker, J. H. Bassman, W. R. Bidlake, A. A. Wir
1992, Scientia Horticulturae (52) 313-329
Net photosynthesis (Pn), dark respiration (Rd), transpirational flux density (TFD) and leaf conductance (kl) on glasshouse-grown plants of almond, apple, fig, grape, olive, peach and Asian pear were examined under various laboratory environmental conditions. Grape and almond had the highest light-saturated photosynthetic rates, greater than 20 μmol CO2 m−2 s−1. Apple had...
