Jose Luis Abella-Gutiérrez, Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada, Mexico, Cinthya Esther Nava-Fernandez, Department of sediment and isotope geology of Ruhr-Universität, Bochum, Germany, Juan Carlos Herguera, Center for Scientific Research and Higher Education at Ensenada, Ensenada, Mexico and Connie A Woodhouse, University of Arizona, Tucson, AZ, United States