1. Director of the Peabody Museum of Natural History and a professor in the Department of Geology and Geophysics and in the Department of Biology, Yale University, New Haven, Connecticut 06520.
2. Director of the Carnegie Museum of Natural History, Pittsburg, Pennsylvania 15213.
3. Curator of the Section of Vertebrate Fossils, Carnegie Museum of Natural History, Pittsburg, Pennsylvania 15213.
4. Palynological Laboratories, College of Earth and Mineral Sciences,Pennsylvania State University, University Park 16802.