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It is likely that mosasaurs became extinct along with the dinosaurs during the extinction event at the end of the Cretaceous Period
left lower jaw with no teeth and an impression of the maxilla as found in the matrix
Marshall County Petroglyph
Compsognathus Poster - 18" x 24"
Ichthyosaur, marine reptile skeleton Styracosaurus It is likely that mosasaursPronounced (IK thee oh SAWR us) Ichthyosaurus was, a dolphin like reptile up to 75 feet long. It could swim at 25 mph (40 kph). Ichthyosaurs had a tall dorsal fin, a half moon shaped tail, paddle like flippers and smooth skin. The nostrils were near the eyes on the top of the head. It had massive ear bones and large eyes, probably giving it acute hearing and sight. These marine reptiles gave birth to live young. Their diet was mostly fish, but also
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