Author Affiliations +
JULIA A. CLARKE,* LUIS M. CHIAPPE**
*Department of Geology and Geophysics, Yale University, P.O. Box 208109, New Haven, CT 06520-8109.
**Research Associate, Division of Vertebrate Zoology (Ornithology), American Museum of Natural History. Associate Curator and Chairman, Section of Vertebrate Paleontology, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007.
