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350-Million-Year-Old Shark Fossil With Unique Tooth Arrangement Unearthed From Inside World's Longest Cave SystemResearchers have detected a 350-million-year-old shark fossil that lived in the Mammoth Cave System when it was submerged in ...
Scientists have uncovered a previously unknown species of extinct shark deep within the labyrinth of Mammoth Cave in Kentucky — the world’s longest known cave system. The species, named Macadens ...
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