Sip back and explore Colorado’s rich geodiversity reveals world-famous fossil sites and dinosaur discoveries. Designated in 1982, Stegosaurus is the official state fossil, first unearthed in the Morrison Formation. Colorado’s fossil record spans 2.7 billion years, with finds from the White River, Green River, and Morrison Formations, plus Florissant Fossil Beds. From Jurassic giants to Eocene mammals, Colorado offers unparalleled insights into prehistoric life and geological