Author Affiliations +
JERALD D. HARRIS,1,* ALEX DOWNS2
1aNew Mexico Museum of Natural History and Science, 1801 Mountain Road NW, Albuquerque, New Mexico 87
2bRuth Hall Museum of Paleontology, Ghost Ranch Conference Center, HC 77, Box 11, Abiquiu, New Mexico
** Present address: Department of Earth and Environmental Science, University of Pennsylvania, 240 South 33rd Street, Philadelphia, Pennsylvania 19104-6316; jdharris@sas.upenn.edu