Deep within Mammoth Cave, the world’s longest cave system, paleontologists have uncovered the remains of a never-before-seen species of ancient shark. Named Clavusodens mcginnisi, or McGinnis’ nail ...

The US National Park Service announced the identification of a new species of ancient shark, Clavusodens mcginnisi, discovered in Mammoth Cave National ... resembling old iron nails, which ...

a rock layer made of skeletal and shell parts of crinoids, blastoids, corals, gastropods, and brachiopods. Prior to the discoveries made at Mammoth Cave over the last several years, no shark ...