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    Evolutionary Patterns of Trilobites Across the End Ordovician Mass Extinction

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    Congreve_ku_0099D_12715_DATA_1.pdf (14.54Mb)
    Issue Date
    2013-05-31
    Author
    Congreve, Curtis Raymond
    Publisher
    University of Kansas
    Format
    260 pages
    Type
    Dissertation
    Degree Level
    Ph.D.
    Discipline
    Geology
    Rights
    This item is protected by copyright and unless otherwise specified the copyright of this thesis/dissertation is held by the author.
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    Abstract
    The end Ordovician mass extinction is the second largest extinction event in the history or life and it is classically interpreted as being caused by a sudden and unstable icehouse during otherwise greenhouse conditions. The extinction occurred in two pulses, with a brief rise of a recovery fauna (Hirnantia fauna) between pulses. The extinction patterns of trilobites are studied in this thesis in order to better understand selectivity of the extinction event, as well to understand the effect of the extinction of the evolution of various trilobite groups. To study these patterns two phylogenetic analyses of sphaerexochines and ceraurids were generated and the overall data was combined with two older analyses of homalonotids and deiphonines from my Masters Thesis. Speciation and extinction rates were estimated in the deiphonines and sphaerexochines (two closely related cheirurid clades) to understand the different patterns of extinction and survivorship in greater detail. Then, utilizing the phylogenetic analyses, the end Ordovician is reinterpreted as a large scale analog of Vrba's Relay Model, referred to herein as the Cladal Turnover Model.
    URI
    http://hdl.handle.net/1808/12322
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    • Dissertations [4475]
    • Geology Dissertations and Theses [232]

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    785-864-8983

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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