Scale bar / Grand StaircaseEscalante National Monument / Raymond M. Alf Museum of Palaeontology / Ontario Museum / Grand Staircase-Escalante National Monument / Royal Tyrrell Museum of Palaeontology / University of Utah / Canadian Museum of Nature / Old Trail Museum / American Museum of Natural History / Utah Museum of Natural History / /
Organization
University of Utah / Linnean Society of London / USA TERRY A. GATES* and SCOTT D. SAMPSON Department of Geology and Geophysics / Linnean Society / /
Person
Williamson / SCOTT D. SAMPSON / TERRY A. GATES / / /
Position
axe head / Gryposaurus sp. UMNH VP / *Corresponding author / UMNH VP / Prime Minister / jugal head / CRANIUM DESCRIPTION General / G. monumentensis UMNH VP / General / subadult UMNH VP / /
ProvinceOrState
Alberta / Texas / New Mexico / Utah / New York / Ontario / /