Late Cretaceous Period (65 Million Years Old). Hell Creek Formation, South Dakota. Nice Piece.
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Late Cretaceous Period (65 Million Years Old). Hell Creek Formation, South Dakota. Nice quality.
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Late Cretaceous Period (65 Million Years Old). Hell Creek Formation, South Dakota.
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Great piece. Dinosaur Sacrum Bone - Authentic Dinosaur Fossil. Late Cretaceous Period (65 Million Years Old). Hell Creek Formation, South Dakota.
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They were characterized by their large frill, three horns (two long brow horns and a smaller nasal horn), and a powerful beak and jaws. The frill may have had various functions, including display, protection, and possibly thermoregulation.
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The frill could have been used for defense or possibly to help in mating. The horridus are always found in ground below the prorsus, so they are older. The horridus have a smaller nose horn and larger beak than the prorsus.
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