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Page 5162, results 129026 - 129050

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Ichnofossils of the alluvial Willwood Formation (lower Eocene), Bighorn Basin, northwest Wyoming, U.S.A
T. M. Bown, M. J. Kraus
1983, Palaeogeography, Palaeoclimatology, Palaeoecology (43) 95-128
The ichnofossil assemblage of the lower Eocene Willwood Formation consists of at least nine distinct endichnia that are preserved in full relief. Four forms (three ichnogenera and four ichnospecies) are new and represent fodinichnia and domichnia of oligochaete worms, an insect or spider, an unknown vertebrate (probably a mammal), and...
Heavy-mineral distribution in modern and ancient bay deposits, Willapa Bay, Washington, U.S.A.
Gretchen Luepke, H. Edward Clifton
1983, Sedimentary Geology (35) 233-247
Analysis of heavy-mineral distribution in modern sediments of Willapa Bay, Washington, indicates a dominance of two mineralogic assemblages, one with approximately equivalent amounts of hornblende, orthopyroxene and clinopyroxene, the other dominated by clinopyroxene. The hornblende-orthopyroxene-clinopyroxene suite is derived from the Columbia River, which discharges into the ocean a short distance...
Paleoclimatic analyses of middle Eocene through Oligocene planktic foraminiferal faunas
G. Keller
1983, Palaeogeography, Palaeoclimatology, Palaeoecology (43) 73-94
Quantitative faunal analyses and oxygen isotope ranking of individual planktic foraminiferal species from deep sea sequences of three oceans are used to make paleoceanographic and paleoclimatic inferences. Species grouped into surface, intermediate and deep water categories based on δ18O values provide evidence of major changes in water-mass stratification, and individual...
Late cretaceous-cenozoic magnetostratigraphic and biostratigraphic correlations of the South Atlantic Ocean: DSDP Leg 73
R.Z. Poore, L. Tauxe, S.F. Percival Jr., John L. LaBrecque, R. Wright, N.P. Petersen, Charles C. Smith, P. Tucker, K.J. Hsu
1983, Palaeogeography, Palaeoclimatology, Palaeoecology (42) 127-149
DSDP Leg 73 sediment cores allow direct calibrations of magnetostratigraphy and biostratigraphy for much of the lates Cretaceous to Cenozoic in the mid-latitude South Atlantic Ocean. A complete record of the Cenozoic was not obtained, however, because strong dissolution, poor core recovery and intense core disturbance have masked the biostratigraphy...
Surface deformation in volcanic rift zones
David D. Pollard, Paul T. Delaney, Wendell A. Duffield, Elliot T. Endo, Arnold T. Okamura
1983, Tectonophysics (94) 541-584
The principal conduits for magma transport within rift zones of basaltic volcanoes are steeply dipping dikes, some of which feed fissure eruptions. Elastic displacements accompanying a single dike emplacement elevate the flanks of the rift relative to a central depression. Concomitant normal faulting may transform the depression into a graben...
Accumulation of fossil fuels and metallic minerals in active and ancient rift lakes
Eleanora I. Robbins
1983, Tectonophysics (94) 633-658
A study of active and ancient rift systems around the world suggests that accumulations of fossil fuels and metallic minerals are related to the interactions of processes that form rift valleys with those that take place in and around rift lakes. The deposition of the precursors of petroleum, gas, oil...
Strain accumulation along the San Andreas fault system east of San Francisco Bay, California
W.H. Prescott, M. Lisowski
1983, Tectonophysics (97) 41-56
The occurrence of several large earthquakes to the east of San Francisco Bay during historical times, and present high levels of microseismicity, indicate that a significant part of the relative plate motion may be occurring east of San Francisco Bay. Furthermore, the Hayward fault is known to be slipping aseismically...
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S.R. Moran, L. Clayton
1983, Quaternary Science Reviews (1) xv-xxii
No abstract available....