page_title: Judith River Formation
section_title: Ornithischian dinosaurs
hierarchical_section_title: Judith River Formation / Fauna / Ornithischian dinosaurs
caption_attribution_description: Avaceratops was a small Ceratopsian dinosaur which lived during the late Campanian during the Late Cretaceous Period in what is now the Northwest United States.
context_page_description: The Judith River Formation is a fossil-bearing geologic formation in Montana, and is part of the Judith River Group. It dates to the Late Cretaceous, between 80 and 75 million years ago, corresponding to the "Judithian" land vertebrate age. It was laid down during the same time period as portions of the Two Medicine Formation of Montana and the Oldman Formation of Alberta.
  It is an historically important formation, explored by early American paleontologists such as Edward Drinker Cope, who named several dinosaurs from scrappy remains found here on his 1876 expedition. Modern work has found nearly complete skeletons of the hadrosaurid Brachylophosaurus.
caption: Avaceratops
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