Variation of organic sulfur in macerals of selected Illinois Basin coals
I. Demir, R.D. Harvey
1991, Organic Geochemistry (17) 525-533
An electron microbeam technique was used to determine the distribution of organic sulfur in the main macerals of five Illinois Basin coals. On average, sporinites are the highest, inertinites the lowest, and vitrinites intermediate in organic sulfur for each coal. The observed differences are likely due to varying affinities of...
Geology of the Uranian satellites
S.K. Croft, L.A. Soderblom
1991, Book chapter, Uranus
No abstract available ...
National aerial photography program as a geographic information system resource
Donald L. Light
1991, Conference Paper, GIS/LIS 1991 ACSM-ASPRS Fall Convention
The National Aerial Photography Program (NAPP) is jointly funded by Federal agencies and States that choose to participate in a 50-50 cost sharing cooperative arrangement. The NAPP is designed to acquire black-and-white (B&W) or color infrared (CIR) photography at a scale of 1:40,000. The status of NAPP flying, now going...
Flame ionization mass spectrometry--Isotope ratio determinations for potassium
Howard E. Taylor, John R. Garbarino, S. R. Koirtyohann
1991, Applied Spectroscopy (45) 886-886
The air/acetylene flame provides a convenient ion source for the determination of potassium isotopic ratios by mass spectrometry. Unlike the argon inductively coupled plasma (ICP), the flame provides low background in the mass region of interest. Ion production is quite satisfactory for isotope ratio measurements at the micrograms per milliliter...
Flexural extension of the upper continental crust in collisional foredeeps
D. C. Bradley, W.S.F. Kidd
1991, Geological Society of America Bulletin (103) 1416-1438
Normal faults on the outer slopes of trenches and collisional foredeeps reveal that high-amplitude lithospheric flexure can result in inelastic extensional deformation of the convex side of a flexed plate. This process, which we call "flexural extension," differs fundamentally from rifting in that...
Oxygen, hydrogen, and sulfur isotope studies in the Juneau gold belt, southeastern Alaska: Constraints on the origin of hydrothermal fluids
R.J. Goldfarb, R.J. Newberry, W.J. Pickthorn, C. A. Gent
1991, Economic Geology (86) 66-80
The delta 18 O values of gold-bearing quartz from the Juneau gold belt range from 15.2 to 20.8 per mil, indicating that ore fluid values ranged from 7.2 to 12.8 per mil at an estimated temperature of 300 degrees C. Hydrothermal micas from many of the deposits are characterized by delta D...
Sedimentology and cyclicity in the Lower Permian De Chelly Sandstone on the Defiance Plateau: Eastern Arizona
J. D. Stanesco
1991, Mountain Geologist (28) 1-11
The Lower Permian (Leonardian) De Chelly Sandstone crops out along a north-south trend on the Defiance Plateau of eastern Arizona. It is divided into lower and upper members separated by a tongue of the Supai Formation that pinches out to the north.Lithofacies in the De Chelly Sandstone consist of (1)...
Mineral remains of early life on Earth? On Mars?
E. Iberall-Robbins, A. S. Iberall
1991, Geomicrobiology Journal (9) 51-66
The oldest sedimentary rocks on Earth, the 3.8‐Ga Isua Iron‐Formation in southwestern Greenland, are metamorphosed past the point where organic‐walled fossils would remain. Acid residues and thin sections of these rocks reveal ferric microstructures that have filamentous, hollow rod, and spherical shapes not characteristic of crystalline minerals. Instead, they resemble...
Controls on the composition of fluvial sands from a tropical weathering environment: Sands of the Orinoco River drainage basin, Venezuela and Colombia
M. J. Johnsson, R.F. Stallard, N. Lundberg
1991, Geological Society of America Bulletin (103) 1622-1647
Fluvial sands in the Orinoco River drainage basin fall into three main compositional groupings: (1) sands of subarkose and arkose composition, from high-relief parts of the Guayana Shield, where crystalline rocks are exposed; (2) sands of litharenite and sub-litharenite composition from the active orogenic belt at the western and northwestern...
Petrogenesis and geological history of a uranium source rock: a case study in northeastern Washington, U.S.A.
R. A. Zielinski, R.C. Burruss
1991, Applied Geochemistry (6) 597-612
A small (4 km2) drainage basin in northeastern Washington contains highly uraniferous groundwater and highly uraniferous peaty sediments of Holocene age. The U is derived from granitic bedrock that underlies the entire drainage basin and that contains 9–16 ppm U. This...
Comparison of tetrachloromethane sorption to an alkylammonium-clay and an alkyldiammonium-clay
J. A. Smith, P. R. Jaffe
1991, Environmental Science & Technology (25) 2054-2058
No abstract available....
Crustal structure of the western New England Appalachians and the Adirondack Mountains
S. Hughes, J.H. Leutgert
1991, Journal of Geophysical Research (96)
Presents an interpretation of the crustal velocity structure based on a seismic refraction/wide-angle reflection experiment in eastern North America extending from the Adirondacks in New York State through the northern Appalachians in Vermont and New Hampshire to central Maine. Modeling of the eastern portion of the profile within the New...
Influence of feeding rate on performance of Atlantic salmon fry in an ozonated water reuse system
H. A. Poston, R.C. Williams
1991, Progressive Fish-Culturist (53) 111-113
A 4‐week trial was conducted to determine the optimal feeding level in percent body weight of a commercially prepared, practical diet for early feeding fry of Atlantic salmon (Salmo salar) in an ozonated water reuse system at 17–18°C. Triplicate groups of swimup (0.19‐g) fry were fed one of seven levels...
Resistance of underyearling and yearling Atlantic salmon and lake trout to supersaturation with air
W. F. Krise, R. L. Herman
1991, Journal of Aquatic Animal Health (3) 248-253
Juvenile Atlantic salmon Salmo salar and lake trout Salvelinus namaycush of different sizes were exposed for 96 h to water supersaturated with air. Underyearlings (Atlantic salmon shorter than 66 ± 8 mm [mean total length ± SD] and lake trout shorter than 96 mm) were resistant to high dissolved-gas pressures....
Genotypic and phenotypic variability of Zostera marina on the west coast of North America
T. W. H. Backman
1991, Canadian Journal of Botany (69) 1361-1371
The relation between environmental factors and leaf morphology of Zostera marina L. have long been unclear, primarily because the species is intrinsically variable. The common-garden method was used to determine the genetic, environmental, and interaction components of leaf size variation. Zostera marina consists of several ecotypes with a wide range of phenotypic plasticity. Variation...
Survival and growth of larval striped bass (Morone saxatilis) fed Artemia enriched with highly unsaturated fatty acids (HUFA)
C. A. Lemm, D. P. Lemarie
1991, Aquaculture (99) 117-126
The nutritional value of Artemia nauplii from the Great Salt Lake was effectively improved for larval striped bass (Morone saxatilis) by incorporation of unsaturated fatty acids (20: 5n-3 and 22: 6n-3) into the nauplii by the direct method of enrichment. Survival at 24 days post-hatch increased from 23% to 64% when...
Chemicals for worldwide aquaculture
R. A. Schnick
1991, Book chapter, Fish health management in Asia-Pacific: report on a regional study and workshop on fish disease and fish health management
Regulations and therapeutants or other safe chemicals that are approved or acceptable for use in the aquaculture industry in the US, Canada, Europe and Japan are presented, discussing also compounds that are unacceptable for aquaculture. Chemical use practices that could affect public health are considered and details given regarding efforts...
Streamflow and sediment transport characteristics of the lower Campbell Creek basin, Anchorage, Alaska, 1986-88
S. W. Lipscomb
1991, Water-Resources Investigations Report 91-4074
No abstract available....
Importance of hydrologic data for interpreting wetland maps and assessing wetland loss and mitigation
V. Carter
1991, Biological Report - US Fish & Wildlife Service (90) 79-85
The US Geological Survey collects and disseminates, in written and digital formats, groundwater and surface-water information related to the tidal and nontidal wetlands of the United States. This information includes quantity, quality, and availability of groundwater and surface water; groundwater and surface-water interactions (recharge-discharge); groundwater flow; and the basic surface-water...
Response of Ned Wilson Lake watershed, Colorado, to changes in atmospheric deposition of sulfate
Donald H. Campbell, John T. Turk, Norman E. Spahr
1991, Water Resources Research (27) 2047-2060
The Ned Wilson Lake watershed responds directly and rapidly to changes in precipitation inputs of sulfate, which has important implications for effects of acid deposition on the aquatic system. Chemistry at three precipitation collection sites and three watershed sites (a pond, a lake, and a spring) has been monitored in...
Improved selenium recovery from tissue with modified sample decomposition
W. G. Brumbaugh, M.J. Walther
1991, Journal of the Association of Official Analytical Chemists (74) 570-571
The present paper describes a simple modification of a recently reported decomposition method for determination of selenium in biological tissue by hydride generation atomic absorption. The modified method yielded slightly higher selenium recoveries (3-4%) for selected reference tissues and fish tissue spiked with selenomethionine....
Late Quaternary faulting along the Death Valley-Furnace Creek fault system, California and Nevada
George E. Brogan, Karl S. Kellogg, D. Burton Slemmons, Christina L. Terhune
1991, Bulletin 1991
The Death Valley-Furnace Creek fault system, in California and Nevada, has a variety of impressive late Quaternary neotectonic features that record a long history of recurrent earthquake-induced faulting. Although no neotectonic features of unequivocal historical age are known, paleoseismic features from multiple late Quaternary events of surface faulting are well...
Proposed U.S. Geological Survey standard for digital orthophotos
David Hooper, Vincent Caruso
1991, Conference Paper, GIS/LIS 1991 ACSM-ASPRS Fall Convention
The U.S. Geological Survey has added the new category of digital orthophotos to the National Digital Cartographic Data Base. This differentially rectified digital image product enables users to take advantage of the properties of current photoimagery as a source of geographic information. The product and accompanying standard were implemented in...
Evaluation of a mark-recapture method for estimating mortality and migration rates of stratified populations
R.M. Dorazio, P.J. Rago
1991, Canadian Journal of Fisheries and Aquatic Sciences (48) 254-260
We simulated mark–recapture experiments to evaluate a method for estimating fishing mortality and migration rates of populations stratified at release and recovery. When fish released in two or more strata were recovered from different recapture strata in nearly the same proportions, conditional recapture probabilities were estimated outside the [0, 1]...
The influence of ambient salinity on routine metabolism in the teleost Cyprinodon variegatus Lacepède
F.G. Nordlie, S. J. Walsh, D. C. Haney, T.F. Nordlie
1991, Journal of Fish Biology (38) 115-122
Routine metabolism of the euryhaline cyprinodontid Cyprinodon variegatus Lacepede was measured at a series of ambient salinities ranging from fresh water through 100‰. Fish used had been sequentially acclimated to the test salinities (ambient temperature of 20±1° C and a 12: 12 L: D schedule). Routine metabolic rates were highest at ambient salinities...
