PELTIER, Carly, Lamont-Doherty Earth Observatory, Columbia University, 61 Rte 9W, Palisades, NY 10964, KAPLAN, Michael, PO Box 1000, 61 Route 9WComer Geochem Building, PO Box 1000, Palisades, NY 10964-8000, SCHAEFER, Joerg M., Department of Earth and Environmental Sciences, Columbia University, New York, NY 10027, ARAVENA, Juan Carlos, Centro de Investigacion Gaia Antartica,, Universidad de Magallanes, Punta Arenas, Chile, SOTERES, Rodrigo L., University of Magallanes, Punta Arenas, Chile and SAGREDO, Esteban A., Instituto de Geografía, Pontificia Universidad Catolica de Chile, Santiago, Chile