Oldest horned dinosaur species in North America found in Montana: Hooked beak, sharply pointed cheeks distinguishes neoceratopsian species

10 diciembre 2014

Scientists have named the first definite horned dinosaur species from the Early Cretaceous in North America. The limited fossil record for neoceratopsian–or horned dinosaurs–from the Early Cretaceous in North America restricts scientists’ ability to reconstruct the early evolution of this group.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/mtPpVjJrlGg/141210140825.htm