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  • 1
    Online-Ressource
    Online-Ressource
    Bloomington :Indiana University Press,
    Schlagwort(e): Electronic books.
    Beschreibung / Inhaltsverzeichnis: At the Top of the Grand Staircase: The Late Cretaceous of Southern Utah documents this major stepping stone toward a synthesis of the ecology and evolution of the Late Cretaceous ecosystems of western North America.
    Materialart: Online-Ressource
    Seiten: 1 online resource (656 pages)
    Ausgabe: 1st ed.
    ISBN: 9780253008961
    Serie: Life of the Past Series
    DDC: 560.97925
    Sprache: Englisch
    Anmerkung: Cover -- Title -- Copyright -- Contents -- Foreword -- Preface -- Acknowledgments -- List of Contributors -- 1 One Hundred Thirty Years of Cretaceous Research in Southern Utah -- 2 Geologic Overview -- 3 Accumulation of Organic Carbon-Rich Strata along the Western Margin and in the Center of the North American Western Interior Seaway during the Cenomanian-Turonian Transgression -- 4 Tectonic and Sedimentary Controls, Age, and Correlation of the Upper Cretaceous Wahweap Formation, Southern Utah -- 5 Implications of the Internal Plumbing of a Late Cretaceous Sand Volcano: Grand Staircase-Escalante National Monument, Utah -- 6 The Kaiparowits Formation: A Remarkable Record of Late Cretaceous Terrestrial Environments, Ecosystems, and Evolution in Western North America -- 7 A Late Campanian Flora from the Kaiparowits Formation, Southern Utah, and a Brief Overview of the Widely Sampled but Little-Known Campanian Vegetation of the Western Interior of North America -- 8 Continental Invertebrates and Trace Fossils from the Campanian Kaiparowits Formation, Utah -- 9 Elasmobranchs from Upper Cretaceous Freshwater Facies in Southern Utah -- 10 Freshwater Osteichthyes from the Cenomanian to Late Campanian of Grand Staircase-Escalante National Monument, Utah -- 11 Preliminary Report on Salamanders (Lissamphibia -- Caudata) from the Late Cretaceous (Late Cenomanian-Late Campanian) of Southern Utah, U.S.A. -- 12 Anuran Ilia from the Upper Cretaceous of Utah - Diversity and Stratigraphic Patterns -- 13 Turtles from the Kaiparowits Formation, Utah -- 14 Review of Late Cretaceous Mammalian Faunas of the Kaiparowits and Paunsaugunt Plateaus, Southwestern Utah -- 15 Late Cretaceous Mammals from Bryce Canyon National Park and Vicinity, Paunsaugunt Plateau, Southwestern Utah. , 16 Lizards and Snakes from the Cenomanian through Campanian of Southern Utah: Filling the Gap in the Fossil Record of Squamata from the Late Cretaceous of the Western Interior of North America -- 17 Crocodyliforms from the Late Cretaceous of Grand Staircase-Escalante National Monument and Vicinity, Southern Utah, U.S.A. -- 18 Review of Late Cretaceous Ankylosaurian Dinosaurs from the Grand Staircase Region, Southern Utah -- 19 Ornithopod Dinosaurs from the Grand Staircase-Escalante National Monument Region, Utah, and Their Role in Paleobiogeographic and Macroevolutionary Studies -- 20 Review of Pachycephalosaurian Dinosaurs from Grand Staircase-Escalante National Monument, Southern Utah -- 21 Ceratopsid Dinosaurs from the Grand Staircase of Southern Utah -- 22 Late Cretaceous Theropod Dinosaurs of Southern Utah -- 23 A Trackmaker for Saurexallopus: Ichnological Evidence for Oviraptorosaurian Tracks from the Upper Cretaceous of Western North America -- 24 First Report of Probable Therizinosaur (cf. Macropodosaurus) Tracks from North America, with Notes on the Neglected Vertebrate Ichnofauna of the Ferron Sandstone (Late Cretaceous) of Central Utah -- 25 Fossil Vertebrates from the Tropic Shale (Upper Cretaceous), Southern Utah -- 26 Paleontological Overview and Taphonomy of the Middle Campanian Wahweap Formation in Grand Staircase-Escalante National Monument -- 27 Taphonomy of a Subadult Teratophoneus curriei (Tyrannosauridae) from the Upper Campanian Kaiparowits Formation of Utah -- 28 A New Macrovertebrate Assemblage from the Late Cretaceous (Campanian) of Southern Utah -- Index -- A -- B -- C -- D -- E -- F -- G -- H -- I -- J -- K -- L -- M -- N -- O -- P -- Q -- R -- S -- T -- U -- V -- W -- X -- Z.
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  • 2
    Buch
    Buch
    La Jolla, Calif. : Univ. of California, SCRIPPS Inst. of Oceanography
    Materialart: Buch
    Seiten: 160 S
    Sprache: Unbestimmte Sprache
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Earth and Planetary Sciences 28 (2000), S. 611-667 
    ISSN: 0084-6597
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract There has been considerable controversy concerning the role of chemical weathering in the regulation of the atmospheric partial pressure of carbon dioxide, and thus the strength of the greenhouse effect and global climate. Arguments center on the sensitivity of chemical weathering to climatic factors, especially temperature. Laboratory studies reveal a strong dependence of mineral dissolution on temperature, but the expression of this dependence in the field is often obscured by other environmental factors that co-vary with temperature. In the field, the clearest correlation is between chemical erosion rates and runoff, indicating an important dependence on the intensity of the hydrological cycle. Numerical models and interpretation of the geologic record reveal that chemical weathering has played a substantial role in both maintaining climatic stability over the eons as well as driving climatic swings in response to tectonic and paleogeographic factors.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Sedimentology 37 (1990), S. 0 
    ISSN: 1365-3091
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Late Cretaceous epicontinental phosphorites, porcelanites/cherts, dark-coloured shales, glauconitic sandstones and bioclastic and fine-grained carbonate rocks in Egypt are examined in terms of their overall depositional and diagenetic framework and stable isotopic and organic geochemical characteristics. Two main depositional realms are interpreted and correlated through sequence stratigraphic analysis: (1) a shallow hemipelagic environment accompanying initial stages of marine transgression and conducive to the formation of organic carbon-rich shales, biosiliceous sediments and thick phosphorites, and (2) a relatively high energy depositional regime accompanying sea-level fall during which deltas advanced, glauconites were reworked seaward and prograding oyster banks became periodically exposed to episodes of fresh water diagenesis, thereby promoting solution-collapse phenomena in associated cherts. Lenticular to massive phosphorites are viewed as the result of current winnowing and concentration of authigenic grains initially precipitated in associated reducing shales and biosiliceous sediments. In eastern Egypt the phosphorites form winnowed lag layers, some of which may have been redeposited down slope in structural lows. In the west, these sands were concentrated into giant phosphorite sand waves built by reworking of penecontemporaneously deposited phosphatic muds during marine transgression. Carbon isotopic results substantiate interpretations from modern deposits for limitation of phosphate mineral precipitation with depth in sediments as a result of lattice poisoning. However, direct desorption of phosphorus to pore waters from detrital iron-oxyhydroxide phases also may have been important in the Cretaceous setting, the iron reduced in this process being available for incorporation in glauconites. The main locus for authigenic glauconite precipitation appears to be where iron fluxes from regions of lateritic weathering were highest and near the boundary between oxygenated and reduced waters.This study suggests a model for the common coexistence of glauconites and phosphorites in the geological record. Although upwelling is often advocated as the origin of nearly all giant phosphorite deposits, we suggest that some of these may have been strongly influenced by fluvially derived phosphorus borne on particulates and desorbed from these compounds upon flocculation and/or reduction in bottom waters or pore waters.
    Materialart: Digitale Medien
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  • 5
    Digitale Medien
    Digitale Medien
    [s.l.] : Nature Publishing Group
    Nature 419 (2002), S. 897-898 
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Reconstruction from oxygen-isotope data of global sea-surface temperatures (SSTs) that prevailed during periods when greenhouse-gas levels were higher than at present (that is, in the early Eocene and Cretaceous epochs) indicates that temperatures were significantly warmer than present in mid- ...
    Materialart: Digitale Medien
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  • 6
    Digitale Medien
    Digitale Medien
    [s.l.] : Nature Publishing Group
    Nature 310 (1984), S. 450-451 
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] As stratigraphie resolution in some parts of the geological record improves, and sampling for stable isotope studies becomes ever more detailed, palaeoceano-graphers and geochemists are beginning to discover apparent evidence of major rapid changes in ocean-atmosphere chemistry. Many of these ...
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    [s.l.] : Nature Publishing Group
    Nature 361 (1993), S. 123-124 
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] SIR - Raymo and Ruddiman1 propose a false dichotomy between climate hypoth-eses in which variations in atmospheric CO2 are driven either by accelerated weathering accompanying tectonic uplift or.by changes in CO2 outgassing. Fur-thermore, they propose that mountain uplift is the primary control on ...
    Materialart: Digitale Medien
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  • 8
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Tektite-like glasses preserved at the Cretaceous/Tertiary boundary at Beloc in Haiti provide clear evidence of an impact event. The glass composition suggests that the impact occurred on a continental shelf region, generating a silica-rich glass with chemical composition that reflects the melting ...
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 9
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Live specimens of 5. solidissima were collected from two localities off coastal New Jersey in the Middle Atlantic Bight, from water depths of 10 and 45 m. Growth increment analyses were performed whereby yearly changes in shell growth height were corrected for ontogenetic growth trends11;12 by ...
    Materialart: Digitale Medien
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  • 10
    Digitale Medien
    Digitale Medien
    [s.l.] : Nature Publishing Group
    Nature 337 (1989), S. 61-64 
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] The section at DSDP Site 577 on the Shatsky Rise (32á°26' N, 157á°43' E) was collected by hydraulic piston core and yielded the first continuous, undisturbed sequence of pure nannofossil ooze (〉90% CaCO3) across the Cretaceous/Tertiary (K/T) boundary. Because of the relatively ...
    Materialart: Digitale Medien
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