Geologic Resources Division

"Geology is the anatomy of scenery." - Robert Sterling Yard, Glimpses of our National Parks, 1915

Many parks were established to protect significant geological features, landforms, and viewsheds that frame the natural and cultural heritage of our nation. Park geological features include the world–renowned sculptured depths of Grand Canyon, the ancient fossils of Dinosaur National Monument, the longest recorded cave system in the world at Mammoth Cave National Park, the greatest density of arch  ...