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dc.contributor.authorZaffos, Andrew Alexander
dc.date.accessioned2014-03-04T18:58:20Z
dc.date.available2014-03-04T18:58:20Z
dc.date.issued2010-08
dc.identifier.otherzaffos_andrew_a_201008_ms
dc.identifier.urihttp://purl.galileo.usg.edu/uga_etd/zaffos_andrew_a_201008_ms
dc.identifier.urihttp://hdl.handle.net/10724/26836
dc.description.abstractThis study tests the relationship between fossil abundance and extinction. Samples were collected from the Late Ordovician type-Cincinnatian Series and the earliest Silurian Brassfield Formation of the Cincinnati Arch. The abundance of brachiopod genera and families was assessed with nine different metrics to account for differences across spatial and temporal scale. Each of these metrics was compared to global duration in the fossil record and survivorship across the Ordovician/Silurian boundary. The results indicate that survivors were more abundant than victims, and are further evidence that the Ordovician/Silurian extinction was not accompanied by a macroevolutionary selectivity regime shift. Furthermore, abundances during this interval are not correlated with duration in the fossil record, a finding that is interpreted as further evidence of changing selectivity patterns through time.
dc.languageeng
dc.publisheruga
dc.rightspublic
dc.subjectMass extinction
dc.subjectSelectivity
dc.subjectBrachiopods
dc.titleAbundance and extinction at the Ordovician/Silurian boundary of the Cincinnati Arch, USA
dc.typeThesis
dc.description.degreeMS
dc.description.departmentGeology
dc.description.majorGeology
dc.description.advisorSteven Holland
dc.description.committeeSteven Holland
dc.description.committeeSally Walker
dc.description.committeeSusan Goldstein


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