1Department of Geology, Southern Illinois University, Carbondale IL 62901-4324, USA
2Biodiversity and Climate Research Center (BiK-F), Frankfurt/Main, Germany
3Institut de Minéralogie et de Physique des Milieux Condensés, UMR 7590, Université Paris 6 Pierre and Marie Curie, 4 place Jussieu, 75005 Paris, France
4Department of Geosciences, University of Oslo, P.O. Box 1047 Blindern, N-0316 Oslo, Norway
5Department of Earth & Environmental Science, University of the Pacific, 3601 Pacific Avenue, Stockton, CA 95211, USA