During a trip to Mammoth Cave National Park in November, paleontologist John-Paul Hodnett was stunned.
Preserved in the walls of the cave were parts of a large, fossilized shark head — from a shark that lived about 330 million years ago.
https://www.courier-journal.com/story/news/local/2020/01/29/mammoth-cave-sharks-rare-fossils-found-kentucky-national-park/4565713002/
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