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Mosasaurs Fossils

72–66 million years old

Mosasaurs are large extinct marine lizards and were first discovered in a limestone quarry at Maastricht (The Netherlands) in 1764 and was named after the meuse (or Maas) river. The Mosasaurs were large fish eating, air breathing preditors in the ocean and first appeared in the Cretaceous, about 72 million years ago. During the last 20 million years of the Cretaceous Period, the mosasaurs became the dominant marine predators with the extinction of the ichthyosaurs and pliosaurs.

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