Thanks to the Geological Society of America and The Paleontological Society for Student Research Grants, to Bowling Green State University Geology Department for Student Research Funding, and to Dr. R. Hoare for the Richard D. Hoare Graduate Research Scholarship. In addition, D. Levine from the National Museum of Natural History, A. Molineux from the Texas Memorial Museum, and F. Collier from the Museum of Comparative Zoology for their assistance and access to specimens in the collections under their care. I want to thank the ranch owners for their trust and granting me access to their land. From Bowling Green State University I would like to thank M. M.Yacobucci, J. Frizado, N. Levine, and S. Roberts for their guidance and critical reviews of my work. A very special thanks to R. Trentham and D. Womochel from UT Permian Basin for getting me started. Thanks to J. Johnson (UT El Paso), R. Mapes (Ohio University), and N. Landman (American Museum of Natural History) for their great suggestions. I would also like to thank K. Waggoner for her continual support and encouragement throughout this endeavor.