Editing Front Range (section)

===Lykins Formation===
30 million years later, the sediment deposition was still taking place with the introduction of the [[Lykins Shale]]. This formation can be best attributed to its wavy layers of muddy [[limestone]] and signs of [[stromatolites]] that thrived in a [[tidal flat]] in present-day Colorado. 250 million years ago, the [[Ancestral Rockies]] were eroding away<ref name= WilliamsChronic2014/> 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 became extinct and a great deal on land as well.<ref name="ancientdenvers" />