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dc.contributor.advisorLieberman, Bruce S.
dc.contributor.authorCongreve, Curtis Raymond
dc.date.accessioned2013-09-30T19:57:59Z
dc.date.available2013-09-30T19:57:59Z
dc.date.issued2013-05-31
dc.date.submitted2012
dc.identifier.otherhttp://dissertations.umi.com/ku:12715
dc.identifier.urihttp://hdl.handle.net/1808/12322
dc.description.abstractThe 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.
dc.format.extent260 pages
dc.language.isoen
dc.publisherUniversity of Kansas
dc.rightsThis item is protected by copyright and unless otherwise specified the copyright of this thesis/dissertation is held by the author.
dc.subjectPaleontology
dc.subjectEvolution & development
dc.subjectGeology
dc.subjectEvolution
dc.subjectMass extinctions
dc.subjectOrdovician period
dc.subjectTrilobites
dc.titleEvolutionary Patterns of Trilobites Across the End Ordovician Mass Extinction
dc.typeDissertation
dc.contributor.cmtememberSelden, Paul A.
dc.contributor.cmtememberFowle, David A.
dc.contributor.cmtememberWiley, Edward O.
dc.contributor.cmtememberLi, Xingong
dc.thesis.degreeDisciplineGeology
dc.thesis.degreeLevelPh.D.
kusw.oastatusna
kusw.oapolicyThis item does not meet KU Open Access policy criteria.
dc.rights.accessrightsopenAccess


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