The crustal structure of the axis of the Great Valley, California, from seismic refraction measurements
W.S. Holbrook, Walter D. Mooney
1987, Tectonophysics (140) 49-63
In 1982 the U.S. Geological Survey collected six seismic refraction profiles in the Great Valley of California: three axial profiles with a maximum shot-to-receiver offset of 160 km, and three shorter profiles perpendicular to the valley axis. This paper presents the results of two-dimensional raytracing and synthetic seismogram modeling of...
Lead poisoning in Canada geese on Plum Island, Massachusetts (USA)
R. M. Windingstad, L. S. Hinds III
1987, Journal of Wildlife Diseases (23) 438-442
During December 1983 and early January 1984, about 200 Canada geese (Branta canadensis) died of lead poisoning at Parker River National Wildlife Refuge on Plum Island, Massachusetts. In an effort to determine the source of lead, 100 bottom samples were taken from a refuge impoundment where much of the mortality/morbidity...
Sediment-yield history of a small basin in southern Utah, 1937-1976: Implications for land management and geomorphology
R. Hereford
1987, Geology (15) 954-957
Alluvium deposited in a reservoir from 1937 to 1976 records the sediment-yield history of a small (2.8 km2), high-relief basin in semiarid southern Utah. Stratification in the alluvium shows that sediment was deposited in the reservoir only 21 times in 38 yr, a...
A review of applications of U-Th-Pb isotope systematics to investigations of uranium source rocks.
J. S. Stuckless
1987, Uranium (3) 235-244
U, Th and Pb concentrations and the isotopic composition of Pb can be used to evaluate crystalline rocks as a source for U in sedimentary deposits. Under favourable geologic circumstances, the technique can yield information on both the timing and the amount of U released to the sedimentary environment. The...
Tidal and tidally averaged circulation characteristics of Suisun Bay, California
Lawrence H. Smith, Ralph T. Cheng
1987, Water Resources Research (23) 143-155
Availability of extensive field data permitted realistic calibration and validation of a hydrodynamic model of tidal circulation and salt transport for Suisun Bay, California. Suisun Bay is a partially mixed embayment of northern San Francisco Bay located just seaward of the Sacramento-San Joaquin Delta. The model employs a...
CHANNEL EVOLUTION IN MODIFIED ALLUVIAL STREAMS.
Andrew Simon, Cliff R. Hupp
1987, Transportation Research Record 16-24
This study (a) assesses the channel changes and network trends of bed level response after modifications between 1959 and 1972 of alluvial channels in western Tennessee and (b) develops a conceptual model of bank slope development to qualitatively assess bank stability and potential channel widening. A six-step, semiquantitative model of...
Modes of development of slope canyons and their relation to channel and levee features on the Ebro sediment apron, off-shore northeastern Spain
S. O'Connell, William B. F. Ryan, W. R. Normark
1987, Marine and Petroleum Geology (4)
Six submarine slope canyons in an area of the northwestern Mediterranean, offshore from the Ebro River and Delta, were surveyed with bathymetric swathmapping (SeaBeam) and mid-range side-looking sonar (SeaMARC I). All of the canyons have slightly winding paths with concave-upwards gradients that are relatively steep shallower than 1,200 m. Two...
Inter-laboratory comparison of X-ray fluorescence analyses of eruptive products of El Chichón Volcano, Chiapas, Mexico
Robert I. Tilling, Theodore J. Bornhorst, Joseph E. Taggart Jr., William I. Rose Jr., James J. McGee
1987, Applied Geochemistry (2) 337-345
An inter-laboratory comparison has been made of X-ray fluorescence analyses of 10 samples of lava and pumices from El Chichón Volcano, Chiapas, Mexico. Some determinations of major-element constituents agree within analytical uncertainty, whereas others exchibit significant bias. Analyses carried out at the Michigan Technological University (MTU) laboratory are systematically lower in MgO...
Significance of non-isotropic scattering from vegetation for geobotanical remote sensing
John W. Salisbury, N.M. Milton, P.A. Walsh
1987, International Journal of Remote Sensing (8) 997-1009
Although it has been known for quite some time that individual leaves display non-Lambertian scattering at wavelengths of strong absorption in the visible part of the spectrum, while displaying near-Lambertian behaviour at wavelengths of little absorption in the near-infrared, this is widely ignored in geobotanical remote sensing investigations. Preliminary data...
Estimating threshold values for the land disposal of organic solvent-contaminated wastes
William R. Roy, R. A. Griffin
1987, Journal of Hazardous Materials (15) 365-376
This paper describes conceptual and mathematical modeling approaches to evaluate environmentally suitable waste management practices that prevent ground water pollution from landfill disposal of solid wastes contaminated with organic solvents. Threshold values for disposal of solid wastes contaminated with acetone, nitrobenzene, chlorobenzene, and carbon tetrachloride were estimated using a disposal...
Large-scale volcano-ground ice interactions on Mars
S. W. Squyres, D.E. Wilhelms, A.C. Moosman
1987, Icarus (70) 385-408
The process of volcano-ground ice interaction on Mars is investigated by thermodynamic calculations and observations of Viking Orbiter images. We develop a numerical model of volcano-ground ice interaction that includes heat transport by conduction, radiation from the surface, heat transfer to the...
LEACHATE MIGRATION FROM A SOLID WASTE DISPOSAL FACILITY NEAR BISCAYNE NATIONAL PARK, SOUTH FLORIDA.
Bradley G. Waller, James L. Labowski
1987, Conference Paper
Leachate from the Dade County Solid Waste Disposal Facility (SWDF) is migrating to the east (seaward) and to the south from the currently active disposal cell. Water levels and ground-water flow directions are strongly influenced by water-management practices. The SWDF is constructed over the salt-intruded part of the highly transmissive...
Redescription of Spirodentalium Walcott (Gastropoda: Late Cambrian) from Wisconsin
E. L. Yochelson
1987, Journal of Paleontology (61) 66-69
Spirodentalium Walcott, 1890, was originally described as a scaphopod. A reinterpretation of the type lot suggests that its overall shape is that of an open-coiled gastropod. If so, this is probably the earliest known open-coiled form and it is sinistral in coiling direction....
Wolfcampian brachiopods from the Bird Spring Group, Wamp Spring area, Las Vegas Range, Clark County, Nevada
P. C. Mills, R.L. Langenheim Jr.
1987, Journal of Paleontology (61) 32-55
The Wamp Spring section of the Bird Spring Group consists of approximately 1,600 feet of carbonate rocks subdivided into a basal platy limestone member, lower cliff-forming member, and upper cliff-forming member. Triticites, Schwagerina, and Schubertella kingi in the platy limestone member indicate an early Wolfcampian age. Schwagerina, Schubertella...
FUTURE APPLICATIONS OF EXPERT SYSTEMS FOR THE EVALUATION OF ENERGY RESOURCES.
B.M. Miller
1987, Conference Paper, Society of Petroleum Engineers of AIME, (Paper) SPE
The loss of professional experience and expertise in the domain of the earth sciences may prove to be one of the most serious outcomes of the boom-and-bust cyclic nature of the volatile energy and mining industries. Promising new applications of powerful computer systems, known as 'expert systems' or 'knowledge-based systems',...
Labeling Projections on Published Maps
John P. Snyder
1987, American Cartographer (14) 21-27
To permit accurate scaling on a map, and to use the map as a source of accurate positions in the transfer of data, certain parameters - such as the standard parallels selected for a conic projection - must be stated on the map. This information is often missing on published...
Hydrogeologic controls of surface-water chemistry in the Adirondack region of New York State
N.E. Peters, C. T. Driscoll
1987, Biogeochemistry (3) 163-180
Relationships between surface-water discharge, water chemistry, and watershed geology were investigated to evaluate factors affecting the sensitivity of drainage waters in the Adirondack region of New York to acidification by atmospheric deposition. Instantaneous discharge per unit area was derived from relationships between flow and staff-gage readings at 10 drainage basins...
Preliminary report on gaseous hydrocarbons in sediment and seeps, offshore Eel River basin, California
M.E. Field, K.A. Kvenvolden
1987, Conference Paper, Tectonics, sedimentation and evolution of the Eel River and associated coastal basins of Northern California
No abstract available ...
Role of geophysics in identifying and characterizing sites for high-level nuclear waste repositories.
J. C. Wynn, E.H. Roseboom
1987, Journal of Geophysical Research (92) 7787-7796
Evaluation of potential high-level nuclear waste repository sites is an area where geophysical capabilities and limitations may significantly impact a major governmental program. Since there is concern that extensive exploratory drilling might degrade most potential disposal sites, geophysical methods become crucial as the only nondestructive means to examine large volumes...
Geology of the Caribbean
William P. Dillon, N.T. Edgar, Kathryn M. Scanlon, Kim D. Klitgord
1987, Oceanus (30) 42-52
The Venezuelan and Colombian basins are located on the Caribbean Plate whilst the Yucatan basin is on the North American Plate. The processes occurring at the boundaries between the Caribbean Plate and the adjacent North American, South American and Cocos Plates, and the resulting surface features and patterns of volcanic...
Magmatic history of Red Sea rifting: Perspective from the central Saudi Arabian coastal plain
J.S. Pallister
1987, Geological Society of America Bulletin (98) 400-417
A newly recognized Tertiary dike complex and comagmatic volcanic rocks exposed on the central Saudi Arabian coastal plain record early stages of magmatism related to Red Sea rifting. Intrusive and stratigraphic relationships and new potassium-argon dating indicate episodic magmatism from about 30 Ma to the present. Additional stratigraphic and radiometric...
Application of microwave digestion to the analysis of peat
C. S.E. Papp, L. B. Fischer
1987, The Analyst (112) 337-338
A microwave digestion technique for the dissolution of peat is described and compared with a dry ashing method and a nitric - perchloric - hydrofluoric acid wet digestion. Peat samples with different organic matter contents were used and Ca, Mg, Fe, AI, Na, K, Mn, Zn, Cu and Li were...
Evolution and petroleum geology of Amlia and Amukta intra-arc summit basins, Aleutian Ridge
E.L. Geist, J.R. Childs, D.W. Scholl
1987, Marine and Petroleum Geology (4) 334-352
Amlia and Amukta Basins are the largest of many intra-arc basins formed in late Cenozoic time along the crest of the Aleutian Arc. Both basins are grabens filled with 2-5 km of arc-derived sediment. A complex system of normal faults deformed the basinal strata. Although initial deposits of late Micocene...
A comparison of water solubility enhancements of organic solutes by aquatic humic materials and commercial humic acids
C.T. Chlou, Daniel E. Kile, T.I. Brinton, Ronald L. Malcolm, J.A. Leenheer, P. MacCarthy
1987, Environmental Science & Technology (21) 1231-1234
No abstract available....
Maps showing aeromagnetic intensity, flight altitudes, and generalized aeromagnetic intensity of the Walker Lake 1 degree by 2 degrees Quadrangle, California and Nevada
Donald Plouff
1987, Miscellaneous Field Studies Map 1382-F
No abstract available....
