Testing Proximate Cause Hypotheses for the End-Ordovician Mass Extinction: Do Patterns of Change in Biomarker Signatures Support a Linkage Between Graptolite and Phytoplankton Community Changes?

Nathan Marshall, University at Buffalo, Buffalo, NY, United States, Elizabeth K Thomas, University at Buffalo, Department of Geology, Buffalo, NY, United States, Charles E Mitchell, University at Buffalo, Geology, Buffalo, NY, United States, Diana Aga, University at Buffalo, Department of Chemistry, Buffalo, NY, United States and Rebecca Wombacher, University at Buffalo, Chemistry, Buffalo, NY, United States
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