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  • 1
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    Early-Middle Pleistocene Transitions: The Land-Ocean Evidence (2005)
    London : The Geological Society
    Details
    Description / Table of Contents: The Early-Middle Pleistocene transition (around 1.2 to 0.5 Ma) marks a profound shift in Earth’s climate state. Low-amplitude 41 ka climate cycles, dominating the earlier part of the Pleistocene, gave way progressively to a 100 ka rhythm of increased amplitude that characterizes our present glacial—interglacial world. This volume assesses the biotic and physical response to this transition both on land and in the oceans: indeed it examines the very nature of Quaternary climate change. Milankovitch theory, palaeoceanography using isotopes and microfossils, marine organic geochemistry, tephrochronology, the record of loess and soil deposition, terrestrial vegetationa! change, and the migration and evolution of hominins as well as other large and small mammals, are all considered. These themes combine to explore the very origins of our present biota.
    Pages: Online-Ressource (VII, 326 Seiten)
    ISBN: 1862391815
    URL: http://sp.lyellcollection.org/content/247/1.toc
    Language: English
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  • 2
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    The Palynology and Micropalaeontology of Boundaries (2004)
    London : The Geological Society
    Details
    Description / Table of Contents: This volume explores geological boundaries in time and space using palynology and micropalaeontology. Boundaries produce distinct signatures in the micropalaeontological record. Diffuse or sharp, gradual or abrupt, boundaries can tell us much about the response of biotic systems to environmental change in both marine and terrestrial realms. Different microfossil groups and geological contexts require their own approaches, definitions and considerations of boundaries. The papers in this compilation capture the current range of thinking on the methodology of boundary identification from biostratigraphical, ecological and palaeoenvironmental perspectives. Contributions span the Cambrian to Miocene and feature many fossil groups (including pollen, dinoflagellates, foraminifera, ostracodes, conodonts, and diatoms). With a strong Canadian and North American focus, the volume also includes contributions from Poland, Egypt, Belgium, Argentina and the United Kingdom.
    Pages: Online-Ressource (VII, 355 Seiten)
    ISBN: 1862391602
    URL: http://sp.lyellcollection.org/content/230/1.toc
    Language: English
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  • 3
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    Age of Matuyama-Brunhes boundary constrained by U-Pb zircon dating of a widespread tephra (2015)
    Geological Society of America (GSA)
    In: Geology
    Details
    Publication Date: 2015-05-23
    Description: The youngest geomagnetic polarity reversal, the Matuyama-Brunhes boundary (MBB), provides an important datum plane for sediments, ice cores, and lavas. Its frequently cited age of 780 ka is based on orbital tuning of marine sedimentary records, and is supported by 40 Ar/ 39 Ar dating of Hawaiian lavas using recent age calibrations. Challenging this age, however, are reports of younger astrochronological ages based on oxygen isotope stratigraphy of high-sedimentation-rate marine records, and cosmogenic nuclides in marine sediments and an Antarctic ice core. Here, we present a U-Pb zircon age of 772.7 ± 7.2 ka from a marine-deposited tephra just below the MBB in a forearc basin in Japan. U-Pb dating has a distinct advantage over 40 Ar/ 39 Ar dating in that it is relatively free from assumptions regarding standardization and decay constants. This U-Pb zircon age, coupled with a newly obtained oxygen isotope chronology, yields an MBB age of 770.2 ± 7.3 ka. Our MBB age is consistent with those based on the latest orbitally tuned marine sediment records and on an Antarctic ice core. We provide the first direct comparison between orbital tuning, U-Pb dating, and magnetostratigraphy for the MBB, fulfilling a key requirement in calibrating the geological time scale.
    Print ISSN: 0091-7613
    Electronic ISSN: 1943-2682
    Topics: Geosciences
    Published by Geological Society of America (GSA)
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  • 4
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    Living fossils in the Indo-Pacific warm pool: A refuge for thermophilic dinoflagellates during glaciations (2014)
    Geological Society of America (GSA)
    In: Geology
    Details
    Publication Date: 2014-05-15
    Description: How important are refugia for plankton biogeography? Here for the first time we report living cysts of the fossil dinoflagellate Dapsilidinium pastielsii from Southeast Asia: Shioya Bay (Okinawa, Japan), Koror (Palau), Ambon (Indonesia), East Vietnam Sea (Vietnam), and Masinloc (the Philippines). This species, thought to have become extinct in the early Pleistocene, is the last survivor of a major early Cenozoic lineage. Its disappearance from the Atlantic following the early Pleistocene implies cooling, and the discovery of living D. pastielsii in the Indo-Pacific warm pool suggests that this unique environment with stable temperatures served as an important refuge for thermophilic dinoflagellates with a 〉50 m.y. lineage. This is the first record of a refugium plankton species within the Indo-Pacific warm pool.
    Print ISSN: 0091-7613
    Electronic ISSN: 1943-2682
    Topics: Geosciences
    Published by Geological Society of America (GSA)
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