A fossilised tooth from a previously unknown ancient shark species, estimated to be around 340 million years old, has been discovered in Kentucky's Mammoth Cave National Park, the world's largest cave ...

A rare bite into the past. The fossilized tooth of a newly discovered ancient shark species – dating back about 340 million years – has been unearthed in the world’s largest cave system, officials ...

National Park Service researchers have identified a previously unknown shark species in the limestone walls of Mammoth Cave, the world’s longest known cave system. The animal, named Macadens olsoni, ...

The fossil was found in the Ste. Genevieve Formation, which dates to approximately 335 to 340 million years ago. It was discovered by a combined team of scientists from the National Park Service ...

The air is cool and damp. The light shining from behind is low and tinted, while a park ranger's hand hovers over a button. Then, a switch clicks. Light floods a chasm in the stone, a chamber called ...