1. Universite Louis Pasteur, Ecole et Observatoire des Sciences de la Terre, 1, rue Blessig, 67084 Strasbourg France
2. Department of Geosciences, 208 Deike Building, The Pennsylvania State University, University Park, Pennsylvania 16802-2714
3. National Food Processors Association, 6363 Clark Avenue, Dublin, California 94568
4. Department of Geosciences, Guyot Hall, Princeton University, Princeton, New Jersey 08544