This 250-Million-Year-Old Reef Became a Mountain in Texas – And It’s Packed With Fossils

Beneath the towering Guadalupe Mountains of Texas lies a dramatic story of transformation. Once part of an ancient sea, the fossilized Capitan Reef now forms craggy peaks and iconic cliffs like El Capitan and Guadalupe Peak. This region, rich in marine fossils from the Permian Period, was later buried and then uplifted by tectonic activity. [...]