1. Departamento de Geologia, Centro de Investigacion Cientifica y de Educacion Superior de Ensenada, Carretera Tijuana-Ensenada No. 3918, Zona Playitas, Ensenada, Baja California 22860, México
2. Department of Geological Sciences, San Diego State University, 5500 Campanile Drive, San Diego, California 92182, USA
3. Department of Earth and Planetary Sciences, University of California Davis, One Shields Avenue, Davis, California 95616-8605, USA
4. U.S. Geological Survey, 525 & 535 S. Wilson Street, Pasadena, California 91106-3212, USA
5. Universidad Autónoma de Baja California, Facultad de Ciencias Marinas, Carretera Tijuana-Ensenada No. 3917, Zona Playitas, Ensenada, Baja California 22860, México
6. Centro de Geociencias, Universidad Nacional Autónoma de México, Blvd. Juriquilla, 3001, 76230, Juriquilla, Querétaro, México
7. Earth Sciences, University College London, Gower Street, London, WC1E 6BT, UK
8. Geological Sciences, McCarthy Hall 341B, California State University Fullerton, Fullerton, California 92831, USA