Elizabeth M Niespolo^1,2, Warren D. Sharp¹, Christian A Tryon³, Nicholas Fylstra^1,4, Simon James Armitage⁵, Graham Avery⁶, J. Tyler Faith⁷, Christopher Henshilwood⁸, Richard Klein⁹, Jason E. Lewis¹⁰, Alex Mackay¹¹, Kathryn L. Ranhorn¹², Teresa Steele¹³, Karen Van Niekerk⁸ and Giday W WoldeGabriel^14,15, (1)Berkeley Geochronology Center, Berkeley, CA, United States, (2)University of California Berkeley, Earth and Planetary Science, Berkeley, CA, United States, (3)Harvard University, Anthropology Department, Cambridge, MA, United States, (4)University of Calgary, Chemistry, Calgary, AB, Canada, (5)Royal Holloway, Egham, United Kingdom, (6)Iziko Museums of South Africa, Cape Town, South Africa, (7)University of Utah, Salt Lake City, United States, (8)University of Bergen, Bergen, Norway, (9)Stanford University, Anthropology, Stanford, CA, United States, (10)Stony Brook University and Turkana Basin Institute, Stony Brook, NY, United States, (11)University of Wollongong, Wollongong, Australia, (12)Arizona State University, Tempe, AZ, United States, (13)University of California, Davis, Anthropology, Davis, CA, United States, (14)Los Alamos Natl Lab, Los Alamos, NM, United States, (15)Newport News Nuclear BWXT/Tetra Tech, Los Alamos, NM, United States