Two 325-million-year-old ctenacanth shark fossils discovered in Mammoth Cave shed light on ancient marine ecosystems.

Mammoth Cave National Park lies under sandstone-capped ridges in the hills of southern Kentucky. At present, some 350 miles (500 kilometers) of passages are known, and as much as 600 additional ...

This collapsed sinkhole, the largest known natural entrance to the Mammoth Cave system, is believed by researchers to be where the cave's extensive labyrinth of naturally formed passages first ...

U.S. researchers discovered a new shark species in rock layers at Mammoth Cave National Park in Kentucky, the National Park Service reported. On October 11, which is National Fossil Day ...

No park had a lower rating than Mammoth Cave, where “a natural view is almost impossible to come by, even on the clearest days.” The group attributes the pollution to coal-fired power plants ...