[1] Univ Utah, Dept Geol & Geophys, Salt Lake City, UT 84112 USA
[2] CUNY, Grad Ctr, Dept Anthropol, New York, NY USA
[3] NYCEP, New York, NY USA
[4] Johns Hopkins Univ, Dept Earth & Planetary Sci, Baltimore, MD 21218 USA
[5] Univ Utah, Dept Biol, Salt Lake City, UT 84112 USA
[6] Nat Hist Museum Los Angeles Cty, Vertebrate Paleontol Dept, Los Angeles, CA USA