High-energy carbonate-sand accumulation, the Quicksands, southwest Florida Keys
Eugene A. Shinn, Barbara H. Lidz, Charles W. Holmes
1990, Journal of Sedimentary Research (60) 952-967
High-resolution seismic-reflection profiles of the Quicksands, located along a broad ridge on the platform shelf west of Key West, Florida, indicate a significant deposit of non-oolitic carbonate sand occurs in a belt 47 km long by 28 km wide. The surface of the belt is ornamented by large (5 m),...
Summer-fall survival of American woodcock in Maine
Eric L. Derleth, Greg F. Sepik
1990, Journal of Wildlife Management (54) 97-106
We estimated summer-fall (15 Jun-20 Oct) survival for 32 adult and 96 fledged young American woodcock (Scolopax minor) radiotagged in eastern Maine during 1982-84 using single-interval, multiple-interval, and nonparametric (product-limit) methods. Single-interval survival estimates were 0.90, 0.88, 0.57, and 0.73 for adult males, adult females, young males, and young females,...
Ground-water resources of Honey Lake Valley, Lassen County, California, and Washoe County, Nevada
Elinor H. Handman, Clark J. Londquist, Douglas K. Maurer
1990, Water-Resources Investigations Report 90-4050
Honey Lake Valley is a 2,200 sq-mi, topographically closed basin about 35 miles northwest of Reno, Nevada. Unconsolidated basin-fill deposits on the valley floor and fractured volcanic rocks in northern and eastern uplands are the principal aquifers. In the study area, about 130,000 acre- ft of water recharges the aquifer...
1986 Great Lakes Seismic refraction survey (GLIMPCE): Line A - refraction mode
Patrick Morel-a-l’Huissier, John H. Karl, Anne M. Trehu, Zoltan Hajnal, Robert F. Mereu, Robert P. Meyer, John L. Sexton, C. Patrick Ervin, Alan G. Green, Deborah Hutchinson
1990, Geological Survey of Canada Open File 2283
In the fall of 1986, the Geological Survey of Canada (GSC), the United States Geological Survey (USGS), two Canadian universities -- University of Western Ontario and University of Saskatchewan, and four American universities -- Northern Illinois University, Southern Illinois University, University of Wisconsin-Madison and University of Wisconsin-Oshkosh participated in a...
Major off-axis hydrothermal activity on the northern Gorda Ridge
Peter A. Rona, Roger P. Denlinger, M. R. Fisk, K. J. Howard, G. L. Taghon, Kim D. Klitgord, James S. McClain, G. R. McMurray, J. C. Wiltshire
1990, Geology (18) 493-496
The first hydrothermal field on the northern Gorda Ridge, the Sea Cliff hydrothermal field, was discovered and geologic controls of hydrothermal activity in the rift valley were investigated on a dive series using the DSV Sea Cliff. The Sea Cliff hydrothermal field was discovered where predicted...
Postglacial response of a stream in central Iowa to changes in climate and Drainage basin factors
J. Van Nest, E. Arthur Bettis III
1990, Quaternary Research (33) 73-85
Postglacial geomorphic development of the Buchanan Drainage, a small tributary to the South Skunk River, is reconstructed by documenting relationships among four allostratigraphic units and 17 radiocarbon dates. Formation and headward expansion of the valley was both episodic and time-transgressive. Response to downstream conditions in the South Skunk River largely...
Cosmic ray exposure dating with in situ produced cosmogenic 3He: Results from young Hawaiian lava flows
Mark D. Kurz, D. Colodner, T.W. Trull, Richard B. Moore, K. O’Brien
1990, Earth and Planetary Science Letters (97) 177-189
In an effort to determine the in situ production rate of spallation-produced cosmogenic 3He, and evaluate its use as a surface exposure chronometer, we have measured cosmogenic helium contents in a suite of Hawaiian radiocarbon-dated lava flows. The lava flows, ranging in age...
Conductivity and transit time estimates of a soil liner
I.G. Krapac, K. Cartwright, S.V. Panno, B.R. Hensel, K.H. Rehfeldt, B.L. Herzog
1990, Conference Paper
A field-scale soil linear was built to assess the feasibilty of constructing a liner to meet the saturated hydraulic conductivity requirement of the U.S. EPA (i.e., less than 1 ?? 10-7 cm/s), and to determine the breakthrough and transit times of water and tracers through the liner. The liner, 8...
Spatial resolution requirements for automated cartographic road extraction
S. Benjamin, L. Gaydos
1990, Photogrammetric Engineering and Remote Sensing (56) 93-100
Ground resolution requirements for detection and extraction of road locations in a digitized large-scale photographic database were investigated. A color infrared photograph of Sunnyvale, California was scanned, registered to a map grid, and spatially degraded to 1- to 5-metre resolution pixels. Road locations in each data set were extracted using...
Molecular orbital (SCF-X-α-SW) theory of Fe2+-Mn3+, Fe3+-Mn2+, and Fe3+-Mn3+ charge transfer and magnetic exchange in oxides and silicates
David M. Sherman
1990, American Mineralogist (75) 256-261
Metal-metal charge-transfer and magnetic exchange interactions have important effects on the optical spectra, crystal chemistry, and physics of minerals. Previous molecular orbital calculations have provided insight on the nature of Fe2+-Fe3+ and Fe2+-Ti4+ charge-transfer transitions in oxides and silicates. In this work, spin-unrestricted molecular orbital calculations on (FeMnO10) clusters are...
The Taylor Creek Rhyolite of New Mexico: a rapidly emplaced field of lava domes and flows
W. A. Duffield, G. B. Dalrymple
1990, Bulletin of Volcanology (52) 475-487
The Tertiary Taylor Creek Rhyolite of southwest New Mexico comprises at least 20 lava domes and flows. Each of the lavas was erupted from its own vent, and the vents are distributed throughout a 20 km by 50 km area. The volume of the rhyolite and genetically associated pyroclastic deposits...
Use of social indices to predict reproductive success in canvasbacks
Jerome R. Serie, Lewis M. Cowardin
1990, Journal of Wildlife Management (54) 66-72
We correlated temporal changes in social groupings of canvasbacks (Aythya valisineria) breeding near Minnedosa, Manitoba, with an independent estimate of hen success during 1974-80. Roadside counts of pairs, lone males, and flocked males were made along transects at 5-day intervals, normalized to percentages to allow comparisons among years, and plotted...
A quantitative micropaleontologic method for shallow marine peleoclimatology: Application to Pliocene deposits of the western North Atlantic Ocean
T. M. Cronin, H.J. Dowsett
1990, Marine Micropaleontology (16) 117-147
A transfer function was developed to estimate summer and winter paleotemperatures for arctic to tropical regions of the western North Atlantic Ocean using fossil ostracode assemblages. Q-mode factor analysis was run on ostracode assemblages from 100 modern bottom sediment samples from continental shelves of North America, Greenland and the Caribbean...
Age determinations and growth rates of Pacific ferromanganese deposits using strontium isotopes
B.L. Ingram, J.R. Hein, G. L. Farmer
1990, Geochimica et Cosmochimica Acta (54) 1709-1721
87Sr 86Sr ratios, trace element and REE compositions, and textural characteristics were determined for three hydrogenetic Fe-Mn crusts, one hydrothermal deposit, and two mixed hydrothermalhydrogenetic crusts from the Pacific. The Sr isotope data are compared to the Sr seawater curve for the Cenozoic to determine the ages and growth rates...
Longevity of treethrow microtopography: Implications for mass wasting
R.J. Schaetzl, L.R. Follmer
1990, Geomorphology (3) 113-123
This study examines and compares methods of dating pit/mound microtopography formed by tree uprooting, and provides 14C evidence for the longevity of these landforms. Microtopography can often by dated by reference to known meteorological phenomena, or within certain age constraints, by dendrochronologic means....
Bottom-boundary-layer measurements on the continental shelf off the Ebro River, Spain
D.A. Cacchione, D.E. Drake, M.A. Losada, R. Medina
1990, Marine Geology (95) 179-192
Measurements of currents, waves and light transmission obtained with an instrumented bottom tripod (GEOPROBE) were used in conjunction with a theoretical bottom-boundary-layer model for waves and currents to investigate sediment transport on the continental shelf south of the Ebro River Delta,...
Sedimentology and petroleum occurrence, Schoolhouse Member, Maroon Formation (Lower Permian), northwestern Colorado
Samuel Y. Johnson, Christopher J. Schenk, D. L. Anders, Michele L. Tuttle
1990, American Association of Petroleum Geologists Bulletin (74) 135-150
The Lower Permian Schoolhouse Member of the Maroon Formation forms a partly exhumed petroleum reservoir in the Eagle basin of northwestern Colorado. The Schoolhouse consists mainly of yellowish gray to gray, low-angle to parallel bedded, very fine to fine-grained sandstone of eolian sand-sheet origin; interbedded fluvial deposits are present in...
Techniques for noise removal and registration of TIMS data
S. Hummer-Miller
1990, Photogrammetric Engineering and Remote Sensing (56) 49-53
Extracting subtle differences from highly correlated thermal infrared aircraft data is possible with appropriate noise filters, constructed and applied in the spatial frequency domain. This paper discusses a heuristic approach to designing noise filters for removing high- and low-spatial frequency striping and banding. Techniques for registering thermal infrared aircraft data...
Effects of climatic change on the Thornthwaite moisture index
Gregory J. McCabe, David M. Wolock, Lauren E. Hay, Mark A. Ayers
1990, Water Resources Bulletin (26) 633-643
The Thornthwaite moisture index is a useful indicator of the supply of water (precipitation) in an area relative to the demand for water under prevailing climatic conditions (potential evapotranspiration). This study examines the effects of changes in climate (temperature and precipitation) on the Thornthwaite moisture index in the conterminous United...
Carbon isotope constraints on degassing of carbon dioxide from Kilauea Volcano
T.M. Gerlach, B.E. Taylor
1990, Geochimica et Cosmochimica Acta (54) 2051-2058
We examine models for batch-equilibrium and fractional-equilibrium degassing of CO2 from magma at Kilauea Volcano. The models are based on1.(1) the concept of two-stage degassing of CO2 from magma supplied to the summit chamber,2.(2) C isotope data for CO2 in eruptive and noneruptive (quiescent) gases from Kilauea and<li...
Estimates of ion sources in deciduous and coniferous throughfall
L.J. Puckett
1990, Atmospheric Environment - Part A General Topics (24) 545-555
Estimates of external and internal sources of ions in net througfall deposition were derived for a deciduous and coniferous canopy by use of multiple regression. The external source component appears to be dominated by dry deposition of Ca2+, SO2 and NO3− during dormant and growing seasons for the two canopy types. Increases...
Structure and morphology of magnetite anaerobically-produced by a marine magnetotactic bacterium and a dissimilatory iron-reducing bacterium
N.H.C. Sparks, S. Mann, D.A. Bazylinski, Derek R. Lovley, H.W. Jannasch, R.B. Frankel
1990, Earth and Planetary Science Letters (98) 14-22
Intracellular crystals of magnetite synthesized by cells of the magnetotactic vibroid organism, MV-1, and extracellular crystals of magnetite produced by the non-magnetotactic dissimilatory iron-reducing bacterium strain GS-15, were examined using high-resolution transmission electron microscopy, electron diffraction and57Fe Mo¨ssbauer spectroscopy. The magnetotactic...
Qualitative and numerical analyses of the effects of river inflow variations on mixing diagrams in estuaries
L.A. Cifuentes, L. E. Schemel, J.H. Sharp
1990, Estuarine, Coastal and Shelf Science (30) 411-427
The effects of river inflow variations on alkalinity/salinity distributions in San Francisco Bay and nitrate/salinity distributions in Delaware Bay are described. One-dimensional, advective-dispersion equations for salinity and the dissolved constituents are solved numerically and are used to simulate mixing in the estuaries. These simulations account for time-varying river inflow, variations...
Determination of trace levels of herbicides and their degradation products in surface and ground waters by gas chromatography/ion-trap mass spectrometry
W. E. Pereira, C.E. Rostad, T.J. Leiker
1990, Analytica Chimica Acta (228) 69-75
A rapid, specific and highly sensitive method is described for the determination of several commonly used herbicides and their degradation products in surface and ground waters by using gas chromatography/ion-trap mass spectrometry. The compounds included atrazine, and its degradation products desethylatrazine and desisopropylatrazine; Simazine; Cyanazine; Metolachlor; and alachlor and its...
Early Holocene pecan, Carya illinoensis, in the Mississippi River Valley near Muscatine, Iowa
E. Arthur Bettis III, R. G. Baker, B.K. Nations, D.W. Benn
1990, Quaternary Research (33) 102-107
A fossil pecan, Carya illinoensis (Wang.) K. Koch, from floodplain sediments of the Mississippi River near Muscatine, Iowa, was accelerator-dated at 7280 ?? 120 yr B.P. This discovery indicates that pecan was at or near its present northern limit by that time. Carya pollen profiles from the Mississippi River Trench...
