Assertion: plesiosaur | /r/HasProperty | ancient reptile
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Source sentences:
text: Based on the flipper photos and the eyewitness sightings, Scott concluded that Nessie was a plesiosaur, an ancient reptile that was thought to have gone extinct along with the dinosaurs some 65 million years ago.
text: Plesiosaurs were ancient marine reptiles that first appeared about 215 million years ago.