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Skulls of Horned Dinosaurs

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Skulls of Horned Dinosaurs.jpg Skulls of Dinosaurs, illustrating the principal typesThumbnailsSkulls of Iguanodont and Trachodont DinosaursSkulls of Dinosaurs, illustrating the principal typesThumbnailsSkulls of Iguanodont and Trachodont DinosaursSkulls of Dinosaurs, illustrating the principal typesThumbnailsSkulls of Iguanodont and Trachodont DinosaursSkulls of Dinosaurs, illustrating the principal typesThumbnailsSkulls of Iguanodont and Trachodont DinosaursSkulls of Dinosaurs, illustrating the principal typesThumbnailsSkulls of Iguanodont and Trachodont DinosaursSkulls of Dinosaurs, illustrating the principal typesThumbnailsSkulls of Iguanodont and Trachodont Dinosaurs

Skulls of Horned Dinosaurs. The lower row, Ceratops, Styracosaurus, Monoclonius, are from the Middle Cretacic (Belly River formation) of Alberta; Anchiceratops is from the Upper Cretacic (Edmonton formation) of Alberta; Triceratops and Torosaurus from the uppermost Cretacic (Lance formation) of Wyoming.