1. Department of Geosciences; Skidmore College; Saratoga Springs New York USA
2. Exxon-Mobil, Inc.; Houston Texas USA
3. Earth Observatory of Singapore; Nanyang Technological University; Nanyang Singapore
4. Department of Geological Sciences; East Carolina University; Greenville North Carolina USA
5. Center for Environmental Studies; Shepherd University; Shepherdstown West Virginia USA
6. Deceased 3 February 2011