Jim I. Mead
Department of Geology and the Quaternary Sciences Program
Northern Arizona University
Flagstaff, Arizona 86011
and
Museum of Northern Arizona
Flagstaff, Arizona, 86001
USA

Jim I. Mead is Professor of Geology, and Director of the Quaternary Sciences Program, Northern Arizona University.  Major research projects include the Rancholabrean fauna from Térapa, Sonora, Mexico; cranial morphology of modern and fossil agamid lizards from Western Australia; and the evolution of North American bovids (the topic of this paper).