Jennifer J Scott, Mount Royal University, Department of Earth and Environmental Sciences, Calgary, AB, Canada, Mona Stockhecke, University of Minnesota Duluth, Earth and Environmental Sciences Department, Duluth, MN, United States; EAWAG Swiss Federal Institute of Aquatic Science and Technology, Duebendorf, Switzerland, Alan L Deino, Berkeley Geochronology Center, Berkeley, CA, United States, John Kingston, University of Michigan Ann Arbor, Department of Anthropology, Ann Arbor, MI, United States, Karlyn Westover, Indiana State University, Earth and Environmental Systems, Terre Haute, IN, United States and Andrew S Cohen, University of Arizona, Department of Geosciences, Tucson, AZ, United States