Earthquake location in island arcs
E.R. Engdahl, J. W. Dewey, K. Fujita
1982, Physics of the Earth and Planetary Interiors (30) 145-156
A comprehensive data set of selected teleseismic P-wave arrivals and local-network P- and S-wave arrivals from large earthquakes occurring at all depths within a small section of the central Aleutians is used to examine the general problem of earthquake location in island arcs. Reference hypocenters for this special data set...
Application of automated image analysis to coal petrography
E. C. T. Chao, J.A. Minkin, C.L. Thompson
1982, International Journal of Coal Geology (2) 113-150
The coal petrologist seeks to determine the petrographic characteristics of organic and inorganic coal constituents and their lateral and vertical variations within a single coal bed or different coal beds of a particular coal field. Definitive descriptions of coal characteristics and...
Interfingering of the Frontier Formation and Aspen Shale, Cumberland Gap, Wyoming.
J. M'gonigle
1982, Mountain Geologist (19) 59-61
The basal part, or the Chalk Creek Member, of the non-marine lower Frontier Formation (Upper Cretaceous) includes a thin coal bed that grades S into a carbonaceous shale. The latter plus associated sandstones and shales pinch out S of Cumberland Gap and lie stratigraphically below the top of the Aspen...
Late Pleistocene- Holocene transgressive sedimentation in deltaic and non-deltaic areas of the northeastern Bering epicontinental shelf.
C.H. Nelson
1982, Geologie en Mijnbouw (61) 5-18
The distribution of late Pleistocene and Holocene surface sediments on the northern Bering Seafloor is patchy and dependent upon locations of seafloor bedrock and pre-late Pleistocene glacial debris, late Holocene river sediment influx, and modern strong bottom currents. Seafloor vibracores and high-resolution profiles record two different sedimentary environments in the...
Genetic implications of minor-element and Sr-isotope geochemistry of alkaline rock complexes in the Wet Mountains area, Fremont and Custer counties, Colorado
T.J. Armbrustmacher, C. E. Hedge
1982, Contributions to Mineralogy and Petrology (79) 424-435
Concentrations of Rb, Sr, and REE (rare earth elements), and Sr-isotopic ratios in rocks of the Cambrian alkaline complexes in the Wet Mountains area, Colorado, show that rocks formed as end-products of a variety of magmas generated from different source materials. The complexes generally contain a bimodal suite of cumulus...
The graphic cell method: a new look at digitizing geologic maps
J.T. Hanley
1982, Computers & Geosciences (8) 149-161
The graphic cell method is an alternative method of digitizing areal geologic information. It involves a discrete-point sampling scheme in which the computer establishes a matrix of cells over the map. Each cell and the whole cell is assigned the identity or value of the geologic information that is recognized...
Formation and interpretation of dilatant echelon cracks
D. D. Pollard, P. Segall, P.T. Delaney
1982, Geological Society of America Bulletin (93) 1291-1303
The relative displacements of the walls of many veins, joints, and dikes demonstrate that these structures are dilatant cracks. We infer that dilatant cracks propagate in a principal stress plane, normal to the maximum tensile or least compressive stress. Arrays of echelon crack...
Geochemical indices of fine sediment transport, northwest Gulf of Mexico
C. W. Holmes
1982, Journal of Sedimentary Petrology (52) 307-321
The 210 Pb distribution, the clay mineralogy distribution, and the distribution of three trace metals, barium, lead, and manganese, in the sediments of the south Texas shelf are related to the dynamics of the sedimentary transport process. 210 Pb, whose concentration is time dependent, defines three loci...
Unroofing history of a suture zone in the Himalaya of Pakistan by means of fission-track annealing ages
P.K. Zeitler, R.A.K. Tahirkheli, C. W. Naeser, N.M. Johnson
1982, Earth and Planetary Science Letters (57) 227-240
The uplift history of the Swat Valley and Hazara region of northwestern Pakistan has been established using 22 fission-track dates on apatite, zircon and sphene. A major fault, the Main Mantle Thrust (MMT) strikes east-west across the Swat Valley, separates regions...
Laboratory measurements of reservoir rock from the Geysers geothermal field, California
D.A. Lockner, R. Summers, D. Moore, J.D. Byerlee
1982, International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts (19) 65-80
Rock samples taken from two outcrops, as well as rare cores from three well bores at the Geysers geothermal field, California, were tested at temperatures and pressures similar to those found in the geothermal field. Both intact and 30?? sawcut cylinders were deformed at confining pressures of 200-1000 bars, pore...
Biostratigraphy and paleoenvironment of Miocene- Pliocene hemipelagic limestone: Kingshill Seaway, St. Croix, US Virgin Islands.
B. H. Lidz
1982, Journal of Foraminiferal Research (12) 205-233
The Kingshill Limestone and younger carbonate rocks constitute the central portion of St. Croix, forming the remains of an ancient seaway that was flanked by emergent highlands. The seaway has been filled with thick epipelagic sediments alternating with carbonate turbidites and ash falls and capped with shallow-water reefal and terrigenous...
Stream-grade variation and riparian-forest ecology along Passage Creek, Virginia
Cliff R. Hupp
1982, Bulletin of the Torrey Botanical Club (109) 488-499
Passage Creek, in northwestern Virginia, flows on relatively nonresistant shales, then cuts through a gorge underlain by resistant sandstone In the gorge, the stream gradient steepens, the size of bed material increases, a braided channel forms, and riparian-forest composition and growth form changes relative to areas outside the gorge Effects...
The impact of entrainment and impingement on fish populations in the Hudson River estuary : Volume III : An analysis of the validity of the utilities' stock recruitment curve-fitting exercise and "prior estimation of beta" technique
S.W. Christensen, C.P. Goodyear, B.L. Kirk
1982, Report
No abstract available at this time...
A user's guide for the stock-recruitment model validation program
S.W. Christensen, B.L. Kirk, C.P. Goodyear
1982, Report
No abstract available at this time...
The impact of entrainment and impingement on fish populations in the Hudson River estuary: Volume II: Impingement impact analyses, evaluations of alternative screening devices, and critiques of utility testimony relating to density-dependent growth, the age-composition of the striped bass Spawning stock, and the LMS Real-Time Life Cycle Model
L.W. Barnthouse, W. Van Winkle, J. Golumbek, G. F. Cada, C.P. Goodyear, S.W. Christensen, J.B. Cannon, D.W. Lee
1982, Report
No abstract available at this time...
A study of gizzard nematodes and renal coccidiosis in Canada geese (Branta canadensis interior) of the Mississippi Valley population
Benjamin N. Tuggle
1982, Thesis
A total of 309 Mississippi Valley Population Canada geese, Branta canadensis interior, of different sex and age groups was collected from three locations in the Mississippi Flyway from 1979-1981 and examined for gizzard nematodes and renal coccidia. Three species of nematodes were removed from the gizzards, Amidostomum anseris, A. spatulatum,...
Use of a mammalian resource by a Chihuahuan snake community
R.P. Reynolds, N.J. Scott Jr.
1982, Wildlife Research Report 13
No abstract available at this time...
Influence of climate and density on survival of desert bighorn lambs
David M. Leslie Jr., C. L. Douglas
1982, Technical Report CPSU/UNLV 025/02
No abstract available at this time...
Simulated effects of transplant removal from the River Mountains bighorn herd
David M. Leslie Jr., C. L. Douglas
1982, Technical Report CPSU/UNLV 025/03
No abstract available at this time...
Extraction and investigative techniques for study of interstitial waters of unconsolidated sediments: A review
P.A. Kriukov, Frank T. Manheim
Kent A. Fanning, Frank T. Manheim, editor(s)
1982, Book chapter, The dynamic environment of the ocean floor
No abstract available....
Effects of soils and grazing on breeding birds of uncultivated upland grasslands of the Northern Great Plains
H.A. Kantrud, R.L. Kologiski
1982, Wildlife Research Report 15
The principal use of uncultivated upland grasslands in the northern Great Plains is for livestock production. However, on lands set aside for wildlife or for scientific or recreational use, grazing by livestock may be used as a management measure to enhance populations of game species or to create conditions that...
Using stem basal area to determine biomass and stand structure in chamise chaparral
T.J. Stohlgren, N.L. Stephenson, D.J. Parsons, P.W. Rundel
1982, General Technical Report PSW-58
No abstract available at this time...
Rifting history and structural development of the continental margin north of Alaska
Arthur Grantz, S. D. May
1982, Book chapter, M 34: Studies in continental margin geology
Seismic-reflection profiles in the Alaskan Beaufort Sea and onshore geology indicate that the continental margin north of Alaska is of Atlantic type. Rifting appears to have begun in earliest Jurassic time, about 190 to 185 m.y. ago, when crustal extension created a rift-valley system beneath the Beaufort shelf and part...
Hydrates of natural gas in continental margins
K.A. Kvenvolden, L.A. Barnard
1982, Book chapter, Studies in continental margin geology
Natural gas hydrates in continental margin sediment can be inferred from the widespread occurrence of an anomalous seismic reflector which coincides with the predicted transition boundary at the base of the gas hydrate zone. Direct evidence of gas hydrates is provided by visual observations of sediments from the landward wall...
A new instrument for sampling flocculent material at the water/sediment interface
Michael H. Bothner, Page C. Valentine
1982, Journal of Sedimentary Research (52) 639-640
We have designed an instrument to collect fine-grained and flocculent material from the water/sediment interface for chemical and mineralogical analysis. The sampler can be used from a manned research submersible or by a diver in shallow water. In areas of active deposition, the material collected represents the most recently deposited...
