Late Cretaceous Period (65 Million Years Old). Hell Creek Formation, South Dakota.
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Hell Creek Formation, South Dakota. Late Cretaceous Period (65 Million Years Old).
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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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Its light and dark coloration along with small black dots from lichens indicates that it was a surface find.
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Late Cretaceous Period (65 Million Years Old). Hell Creek Formation, South Dakota.
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A nice piece to add to a dinosaur bone collection.
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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. Each tooth in use was at the top of a "stack" of 3 to 5 undeveloped teeth underneath.
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