OLSEN, Paul, Earth and Environmental Sciences, Lamont-Doherty Earth Observatory of Columbia University, 61 Route 9W, Palisades, NY 10964-1000, polsen@ldeo.columbia.edu, KENT, Dennis V., Earth and Planetary Sciences, Rutgers University, Wright-Rieman Labs, 610 Taylor Road, Piscataway, NJ 08854, REID, Jeffrey C., North Carolina Division of Land Resources, 1612 Mail Service Center, Raleigh, NC 27699-1612, WHITESIDE, Jessica H., Department of Geological Sciences, Brown University, Providence, RI 02912, LETOURNEAU, Peter, Lamont-Doherty Earth Observatory, 61 Route 9W, Palisades, NY 10964, and ET-TOUHAMI, Mohammed, Département des Sciences de la Terre, Université Mohammed Premier Oujda, Oujda, 60,000, Morocco