Lykins Formation was formed during the Jurassic and Triassic periods 150-250 million years ago. The sediment deposition of wavy layers of muddy limestone and signs of stromatolites that thrived in a smelly tidal flat at present-day Colorado. The Ancestral Rockies were burying themselves while the shoreline was present during the break-up of Pangaea. This formation began right after Earth's largest extinction 251 million years ago at the Permian-Triassic Boundary. Ninety percent of the planet's marine life was destroyed and a great deal on land as well.: Related sites: Garden of the Gods, Red Rocks Park, Roxborough State Park