plesiosaur tooth - a marine reptile that existed during the mesozoic era

204 6cm ago ancient animal bones closeup creature cretaceus era evolution existed fish fossil fossilized free geology graphic history image jaw jurassic late length macro marine mauritanicus mesozoic million mineral nature ocean old paleontology period photo photograph picture plesiosaur plesiosaurus prehistoric reptile rock royalty sauropterygia specimen stock stone that tooth triassic vertebrate years