caption: Mosasaurs, Late Cretaceous (from <PERSON> meaning the 'Meuse river', and Greek sauros meaning 'lizard') are large extinct marine lizards. The first fossil remains were discovered in a limestone quarry at Maastricht on the Meuse in Prehistoric Dinosaurs, Dinosaur Fossils, Prehistoric Creatures, Dinosaur Puppet, Reptiles, Extinct Animals, Animal Skulls, Sea Monsters, Fauna
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