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Keywords from Image Description:
Ceratopsidae AMNH. Skulls of different members of the Ceratopsidae group of ornithischian dinosaurs Original caption Skulls of Horned Dinosaurs The lower row Chasmosaurus Styracosaurus Monoclonius are from the Middle Cretacic Belly River formation of Alberta Anchiceratops is from the Upper Cretacic Edmonton formation of Alberta Triceratops