1. Department of Geosciences, Virginia Tech , Blacksburg, VA 24061 , USA
2. North Carolina Museum of Natural Sciences , 11 West Jones Street, Raleigh, North Carolina 27601 , USA
3. Mention Bassins sédimentaires, Evolution, Conservation, BEC, Université d’Antananarivo , Antananarivo 101 , Madagascar
4. Department of Earth Science, University of California, Santa Barbara , CA 93106 , USA
5. Division of Paleontology and Richard Gilder Graduate School, American Museum of Natural History , New York NY 10024 , USA