Department of Geological Sciences, 202 Bevill Building, University of Alabama, Tuscaloosa, AL 35487 United States
National Science Foundation-Arizona Accelerator Mass Spectometry Facility, Department of Physics, University of Arizona, Tuscon, AZ 85721 United States
Department of Anthropology and Institute for Quaternary and Climate Studies, 120 Alumni Hall, University of Maine, Orono, ME 04469 United States