Researchers 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 ...

The fossil was found in the Ste. Genevieve Formation, which dates to approximately 335 to 340 million years ago. It was ...