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Cast of Mesosaurus

Fossils of Mesosaurus, a small reptile that swam in shallow coastal waters about 275 million years ago but could not have crossed an ocean, occur in both South America and Africa.

Group: Sedimentary
Catalog Number: USNM 1930
Time Period: Permian Period, 290-251 million years ago

     2017

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Smithsonian National Museum of Natural History Department of Mineral Sciences website Credits