1. Department of Geology, University of Cincinnati, Cincinnati, Ohio 45221, USA.
2. Clinton Woods, Tuxedo, NY 10987, USA.
3. Institute for Geology, University of Oslo, Post Office Box 1047, BlindernN-0316, Oslo, Norway
4. Department of Plant Biology and Pathology and Institute for Quaternary Studies, University of Maine, Orono, ME 04469, USA.
5. Servicio Nacional de Geologia y Mineria, Casilla 10465, Santiago, Chile
6. Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, USA.
7. Institute for Geology, University of Bern, Bern, Switzerland
8. Institute for Quaternary Studies, University of Maine, Orono, ME 04469, USA.
9. Department of Geological Sciences and Institute for Quaternary Studies, University of Maine, Orono, ME 04469, USA.