William Lettis & Associates Inc, 1777 Botelho Drive Suite 262, Walnut Creek, CA 94596, ; University of Southern California, Department of Earth Sciences, 3651 Trousdale Prkwy, ZHS117, Los Angeles, CA 90089, United States
University of Southern California, Department of Earth Sciences, 3651 Trousdale Prkwy, ZHS117, Los Angeles, CA 90089, United States
CEREGE, BP 80 Europole Méditerranéen de l'Arbois, 3545, Aix en Provence, 4 3545, France ; Lawrence Livermore National Lab. Center for Accelerated Mass Spectrometry, Box 808, Livermore, CA 94550, United States
William Lettis & Associates, Inc, 27220 Turnberry Lane #110, Valencia, CA 91355, United States ; University of Southern California, Department of Earth Sciences, 3651 Trousdale Prkwy, ZHS117, Los Angeles, CA 90089, United States