Hadrosaur Vertebra (Cervical?) | Judith River Formation | Montana shimmer The earliest ammonites appear during

The earliest ammonites appear during the Devonian

Eric Twelker and Jason Phillips) in April 2017 from Moroccan dealers

Late Pleistocene epoch

larger grazing horses like Merychippus and eventually Equus

Hadrosaur Vertebra (Cervical?) | Judith River Formation | Montana shimmer The earliest ammonites appear duringHadrosaur sp. (Maiasaura?) Late Cretaceous (~74 MYO) Judith River Formation Montana, USA Specimen approx. size: 2" x 2" x 1. 5" Hadrosaurs, often called "duck billed dinosaurs," are a family of ornithopod dinosaurs (family Hadrosauridae) that thrived during the Late Cretaceous period. They are among the most well known and successful herbivorous dinosaurs. Hadrosaurs are characterized by: Broad, flattened rostrums (beak like snouts) resembling a