MICHEL, Lauren1, PEPPE, Daniel2, DEINO, Alan L.3, CHENG, Kimberly D.1, SUMMERS, Hunter J.1, VINEYARD, Heather B.1, LEHMANN, Thomas4, MUTETI, Samuel5 and MCNULTY, Kieran P.6, (1)Tennessee Tech UniversityDepartment of Earth Sciences, PO Box 5062, Cookeville, TN 38505-0001, (2)Department of Geosciences, Baylor University, One Bear Place #97354, Waco, TX 76798-7354, (3)Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, CA 94709, (4)Messel Research and Mammalogy Department, Senckenberg Research Institute and Natural History Museum Frankfurt, Senckenberganlage 25, Frankfurt, 60325, Germany, (5)Department of Earth Sciences, National Museums of Kenya, P.O. Box 40658, Nairobi, Kenya, (6)Department of Anthropology, University of Minnesota, 395 Hubert H. Humphrey Center, 301 19th Avenue South, Minneapolis, MN 55455