ACKNOWLEDGMENTS

NJC thanks C.D. Czaplewski and K.P. Dial for their help in the field. EHL thanks P. Holroyd for providing work space in her UCMP lab, for help focusing the camera lucida, and for expediting outrageous and eleventh hour loan requests; we thank Holroyd and the UCMP for providing access to the described fossils. We thank D.K. Elliott, J.I. Mead, and R.A. Martin for reading and commenting on earlier drafts of this paper. We also thank M.O. Woodburne and S. May for their camaraderie and encouragement in preparing for this paper, This project was initiated when S. May proposed a gathering in the Horned Toad Hills area to review the stratigraphy and locate the Lawler Tuff that had been identified by A. Sarna-Wojcicki many years earlier. Later, May asked Woodburne and Lindsay whether his work in the Horned Toad should be published. The answer was a strong YES, resulting in this and May's paper in this volume. We thank May for his diligence, enthusiasm, and help in preparing this paper. Last but not least we thank the editors of this volume for their patience and for the opportunity to contribute to this volume.

C.A. Repenning touched and encouraged many graduate students in vertebrate paleontology during his life (including NJC). We all knew him as a tireless worker and an honest, sincere mentor. Once he knew you, he would never let go of you. This and his outstanding record as a decorated soldier in World War II, enable us to characterize him as a warrior. We never knew a tougher and more relentless warrior than our friend and colleague Rep.