Kentucky's Mammoth Cave National Park is a long way from the ocean, but newly discovered fossils suggest the area was once teeming with sharks.
원문출처 : https://www.cnn.com/travel/article/mammoth-cave-sharks-scn-trnd/index.html
원문출처 : https://www.cnn.com/travel/article/mammoth-cave-sharks-scn-trnd/index.html