Scale bar / University of California Museum / New Mexico Museum of Natural History / Montana State University / Museum P2299.1 / University of California Press / University of California Museum of Paleontology / American Museum of Natural History / University of California / Yale Peabody Museum / Museum of Paleontology / /
Organization
Bureau of Land Management / University of California / Montana State University / Museum of the Rockies / Yale / United States Fish and Wildlife Service / University of California / Berkeley / University of California Press / /
Person
William Hill / William A. Clemens / Dick Hilton / Bob Harmon / Harley Garbani / Nat / Ken Olson / Carrie Ancell / Pat Murphy / Pat Leiggi / Nathan Myhrvold / Jennifer Kren / Michael Holland / /
Position
Author / Editor-in-Chief / Professor / General / /
ProvinceOrState
South Dakota / New Mexico / Saskatchewan / Late Cretaceous Hell Creek Formation / Montana / Garfield / M. B. / California / McCone / /
Proc. R. Soc. B[removed], 2757–2761 doi:[removed]rspb[removed]Published online 1 August 2006 Major cranial changes during Triceratops ontogeny John R. Horner1,* and Mark B. Goodwin2