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Page 4448, results 111176 - 111200

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Publication Extents

Not all publications have extents, not all extents are completely accurate
Silicoflagellate and diatom biostratigraphy in successive Burdigalian transgressions, middle Atlantic coastal plain
Karen L. Wetmore, George W. Andrews
1990, Micropaleontology (36) 283-295
The earliest Miocene strata on the Middle Atlantic Coastal Plain were deposited in two distinct marine transgressions separated by a hiatus in sedimentation of approximately one million years. The older unit (Bed 3A of the Calvert Formation and its correlatives) was deposited in a relatively restricted basin of middle Burdigalian...
Methods of measurement of exploratory well impacts, offshore Florida
Phillip A. Dustan, Jack L. Kindinger, B. H. Lidz, J.H. Hudson
1990, Conference Paper, Proceedings of the American Academy of Underwater Sciences Tenth Annual Scientific Diving Symposium
Six offshore oil well tests were drilled off Key West in the late 1950s and early 1960s. Two wells were drilled on coral bottom, two on carbonate sand, and two on mixed turtle grass and gorgonian/sponge hardbottom. After locating the sites with a proton magnetometer; several underwater assessment methods were...
Effectiveness of the addition of alkaline materials at surface coal mines in preventing or abating acid mine drainage--Part 2. Mine site case studies
Keith Brady, Michael W. Smith, Richard L. Beam, Charles A. Cravotta III,
1990, Conference Paper, Proceedings of the 1990 Mining and Reclamation Conference and Exhibition
The effectiveness of preventing or ameliorating acid mine drainage (AMD) through the application of alkaline additives is evaluated for eight surface coal mines in Pennsylvania. Many of the mine sites had overburden characteristics that made prediction of post‐mining water quality uncertain. Alkaline materials were applied at rates ranging from 42...
Effectiveness of the addition of alkaline materials at surface coal mines in preventing or abating acid mine drainage--Part 1. Geochemical considerations
Charles A. Cravotta III,, Keith Brady, Michael W. Smith, Richard L. Beam
1990, Conference Paper, Proceedings of the 1990 Mining and Reclamation Conference and Exhibition
The addition of alkaline materials to supplement deficient "neutralization potential" (NP) of mine spoil, and thus to prevent or abate acid mine drainage, has riot been successful at most surface coal mines in Pennsylvania. A basic problem may have been improper accounting for acid‐production potential and thus inadequate addition rates...
Numerical simulation of tidal dispersion around a coastal headland
R. P. Signell, W. Rockwell Geyer
Ralph T. Cheng, editor(s)
1990, Book chapter, Residual Currents and Long-Term Transport
Tidal flows around headlands can exhibit strong spatial gradients in the Eulerian currents, resulting in complex Lagrangian trajectories and dispersion of the vertically integrated flow. This typically occurs when the horizontal length scale of the headland is comparable to or smaller than the tidal excursion. The effects of these headlands...
Reevaluation of large-scale dispersivities for a waste chloride plume: Effects of transient flow
Daniel J. Goode, Leonard F. Konikow
1990, Conference Paper, ModelCARE 90: Calibration and Reliability in Groundwater Modelling
This paper investigates the effects of transient groundwater flow on dispersion of a waste chloride plume in the basaltic aquifer beneath the Idaho (USA) National Engineering Laboratory. In an early application of numerical modeling techniques to the two-dimensional simulation of field-scale plumes, previous investigators identified longitudinal and transverse dispersivities using...
Keweenaw hot spot: Geophysical evidence for a 1.1 Ga mantle plume beneath the Midcontinent Rift System
D. R. Hutchinson, R.S. White, W.F. Cannon, K. J. Schulz
1990, Journal of Geophysical Research B: Solid Earth (95) 10869-10884
The Proterozoic Midcontinent Rift System of North America is remarkably similar to Phanerozoic rifted continental margins and flood basalt provinces. Like the younger analogues, the volcanism within this older rift can be explained by decompression melting and rapid extrusion of igneous material during lithospheric extension above a broad,...
The origin of large local uplift in extensional regions
G. King, M. Ellis
1990, Nature (348) 689-693
Large localized uplift is commonly observed in continental regions undergoing extension. These observations can be modelled by planar, high-angle normal faulting of an elastic upper crust overlying an inviscid lower crust. Isostasy provides the necessary driving force. The model quantifies the role of flexural rigidity, density variations in the crust,...
Kinematics of late Paleozoic continental collision between Laurentia and Gondwana
P. E. Sacks, D.T. Secor Jr.
1990, Science (250) 1702-1705
In the Appalachians, late Paleozoic Alleghanian orogenesis is widely regarded as resulting from dextral oblique collision between irregular margins of Gondwana and Laurentia. However, this relative plate motion cannot account for coeval convergence in the Ouachitas and Variscides and is incompatible with some tectonic transport indicators in the Appalachians. An...
Geodetic estimate of coseismic slip during the 1989 Loma Prieta, California, Earthquake
Michael Lisowski, W.H. Prescott, James C. Savage, M. J. Johnson
1990, Geophysical Research Letters (17) 1437-1440
Offsets in the relative positions of geodetic stations resulting from the Loma Prieta earthquake can be explained with a dislocation model that includes buried oblique slip on a rupture surface extending 37 km along the strike of the San Andreas fault, dipping 70° to the SW, and extending from a...
A possible geodetic anomaly observed prior to the Loma Prieta, California, Earthquake
Michael Lisowski, W.H. Prescott, James C. Savage, Jerry L. Svarc
1990, Geophysical Research Letters (17) 1211-1214
Monthly measurements since mid‐1981 of distance from a geodetic station located 11 km from the epicenter of the Loma Prieta earthquake (Ms = 7.1; October 17, 1989) to three stations 30 to 40 km distant provides an unusually complete record of deformation in the epicentral region in the years prior to...
An apparent shear zone trending north‐northwest across the Mojave Desert into Owens Valley, eastern California
James C. Savage, Michael Lisowski, W.H. Prescott
1990, Geophysical Research Letters (17) 2113-2116
Strain rates measured at four geodetic networks in eastern California situated between northern Owens Valley and the Transverse Ranges along a small circle drawn about the Pacific‐North America pole of rotation are remarkably consistent. Each exhibits 0.14 μrad/yr simple right‐lateral engineering‐shear‐strain accumulation across the local vertical plane tangent to the...
Identification of isopropylbiphenyl, alkyl diphenylmethanes, diisopropylnaphthalene, linear alkyl benzenes and other polychlorinated biphenyl replacement compounds in effluents, sediments and fish in the Fox River System, Wisconsin
Paul H. Peterman, Joseph J. Delfino
1990, Biological Mass Spectrometry (19) 755-770
Five polychlorinated biphenyl replacement dye solvents and a diluent present in carbonless copy paper were identified by gas chromatography/mass spectrometry in the following matrices: effluents from a de-inking–recycling paper mill and a municipal wastewater treatment plant receiving wastewaters from a carbonless copy paper manufacturing plant; sediments; and fish collected near...
A proposal to conserve black-footed ferrets and the prairie dog ecosystem
Brian Miller, Christen Wemmer, Dean Biggins, Richard P. Reading
1990, Environmental Management (14) 763-769
Prairie dogs (Cynomys spp.) have been poisoned throughout this century because of grazing competition with livestock. Recent evidence showed these early claims were exaggerated, but animal control was already entrenched in government policy. As a result, ongoing government subsidized poisoning has reduced prairie dogs to about 2% of their former...
Development of survival skills in captive-raised Siberian polecats (Mustela eversmanni) I: locating prey
Brian Miller, Dean Biggins, Chris Wemmer, Roger Powell, Lou Hanebury, Deborah Horn, Astrid Vargas
1990, Journal of Ethology (8) 89-94
Captive-raised mustelids appear to have a rudimentary capacity to kill prey, but the skills necessary for locating prey may be eroded during captivity. We tested the maturational component of prey-searching behavior with captive-raised Siberian polecats (Mustela eversmanni) by subjecting polecats to a simulated prairie dog colony of 6 burrows within...
Development of survival skills in captive-raised Siberian polecats (Mustela eversmanni) II: predator avoidance
Brian Miller, Dean Biggins, Chris Wemmer, Roger Powell, Lorena Calvo, Lou Hanebury, Tracy Wharton
1990, Journal of Ethology (8) 95-104
We exposed naive Siberain polecats (Mustela eversmanni) (aged 2, 3, and 4 months) to a swooping stuffed great horned owl (Buho virginianus) and a stuffed badger (Taxidae taxus) mounted on a remote control toy automobile frame. The first introduction to each was harmless, the second was accompanied by a mild...