Ancient Sharks Discovered in Kentucky's Mammoth Cave - Newsweek

The fossilized remains of six species of ancient shark previously unknown to science have been unearthed in Mammoth Cave National Park in Kentucky, with researchers hailing the site as "one of the most diverse Mississippian shark faunas in North America.".

The fossils of at least 40 different species of shark and close relatives have been discovered in remote cave locations within the park since survey efforts started 10 months ago.

The shark fossils discovered at Mammoth Cave primarily comprise teeth and fin spines, since cartilage, which is softer than bone, makes up the majority of the sharks' skeletons!

"We are very excited to find such an important set of fossils at the park," said paleontologist Rick Toomey, cave resource management specialist and research coordinator at Mammoth Cave National Park