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dc.contributor.authorJarrett, Matt Brett
dc.date.accessioned2014-03-04T18:19:16Z
dc.date.available2014-03-04T18:19:16Z
dc.date.issued2009-08
dc.identifier.otherjarrett_matt_b_200908_ms
dc.identifier.urihttp://purl.galileo.usg.edu/uga_etd/jarrett_matt_b_200908_ms
dc.identifier.urihttp://hdl.handle.net/10724/25830
dc.description.abstractIsotopic temperatures from Late Eocene (35±0.5Ma) Crassostrea gigantissima(Finch, 1824) agree well with a steady Middle to Late Eocene cooling trend seen in previously published isotope data from mollusks and benthic foraminifera. Oysters were collected from along the Savannah River at Griffins Landing in Burke County Georgia to address paleotemperatures during the Late Eocene. Specimens underwent sclerochronological analysis by high resolution microdrilling for carbon and oxygen isotope content. Prior to drilling, cathodoluminescence as well as thin section petrography was performed to assure pristine material. Results from 177 δ18Ocalcite analyses from the left valves of three shells range from -2.45‰ to 0.57‰ (PDB), and suggest average annual temperature of ~19ºC and an average annual range of ~15º to 23ºC. Compared to modern Georgia Coast temperatures, Late Eocene climate was similar during winter and 2ºC - 8ºC cooler during summer. Data also show agreement with 35Ma temperatures from the Gulf Coastal Plain.
dc.languageeng
dc.publisheruga
dc.rightspublic
dc.subjectCrassostrea, schlerochronology, paleoclimatology, Eocene
dc.titleLate Eocene sea surface temperatures
dc.title.alternativeinsights from Crassostrea gigantissima
dc.typeThesis
dc.description.degreeMS
dc.description.departmentGeology
dc.description.majorGeology
dc.description.advisorChristopher Romanek
dc.description.committeeChristopher Romanek
dc.description.committeeBruce Railsback
dc.description.committeeDouglas Crowe


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