Neil Patrick Griffis, University of California Davis, Davis, CA, United States, Roland Mundil, Berkeley Geochronology Ctr, Berkeley, CA, United States, Isabel P Montanez, Univ of California, Davis, Earth and Planetary Sciences, Davis, CA, United States, Bastien Linol, Nelson Mandela University, Geosciences, Port Elizabeth, South Africa, Jon D Richey, University of California Davis, Department of Earth and Planetary Sciences, Davis, CA, United States and Roberto Iannuzzi, Universidade Federal Rio Grande do Sul, Porto Alegre, Brazil