Find out about plesiosaurs—giant marine reptiles that lived about 100 million years ago—in this video excerpt from NOVA. Computer-generated imagery shows what toothy marine monsters like plesiosaurs and ichthyosaurs may have looked like when they were living in the Eromanga Sea, an ancient inland sea in Australia. Host and scientist Richard Smith visits a present-day site of the ancient sea, Cooper Pedy, a mining town that is the location of a large collection of plesiosaur fossils that have become opalized. Smith describes the opalization process, and Marine reptile scientist Maria Zammit says the large size of the collection indicates that the area was likely a nursery.
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