NatGeoSean
Rock
Almost 70 million years ago, the Rocky Mountain uplift began. Giant blocks of ancient crystalline rock, overlain by younger sedimentary rock, broke and were thrust upward. This rocky backbone of mountains forms the heart of Rocky Mountain National Park. Sixty mountain peaks over 12,000 feet high result in world-renown scenery and provide challenges for hikers and climbers. Photograph courtesy National Park Service
Rock
Almost 70 million years ago, the Rocky Mountain uplift began. Giant blocks of ancient crystalline rock, overlain by younger sedimentary rock, broke and were thrust upward. This rocky backbone of mountains forms the heart of Rocky Mountain National Park. Sixty mountain peaks over 12,000 feet high result in world-renown scenery and provide challenges for hikers and climbers. Photograph courtesy National Park Service