Mammoth Cave, the world's longest known cave system, stretches 426 miles under Kentucky. The cave's limestone began forming 330 million years ago when the region was submerged under an ocean. Visitors ...

A “remarkably well-preserved” fossil discovered in Brazil, dating back 113 million years, is now the oldest ant to have ever been found by scientists, a new study has revealed. The ancient fossil was ...

The 150-million-year-old Solnhofen Limestone in southern Germany contains prehistoric lagoon deposits known for yielding wonderfully preserved fossils, including those of pterosaurs: flying reptiles ...

For millions of years, the land we now call the United States has been home to towering prehistoric beasts, strange sea creatures, and lush ancient forests that no longer exist. Evidence of this ...