BENFIELD, Adam1, IVORY, Sarah1, HODELKA, Bailee N.2, ZIMMERMAN, Susan3 and MCGLUE, Michael4, (1)Department of Geosciences, Pennsylvania State University, University Park, PA 16802, (2)Department of Earth and Environmental Sciences, University of Kentucky, 121 Washington Avenue, LEXINGTON, KY 40506, (3)Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, CA 94550; Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, CA 94550, (4)Department of Earth and Environmental Sciences, University of Kentucky, Lexington, KY 40506