Editing Front Range (section)

===Denver Formation===
[[Image:Mmtn.JPG|thumb|right|Front Range near [[Estes Park, Colorado]] ([[Mummy Mountain (Colorado)|Mummy Mountain]])]]
The [[Denver Formation]] contains fossils of dinosaurs like ''[[Tyrannosaurus|Tyrannosaurus rex]]'' and [[Triceratops]]. While the forests of vegetation, dinosaurs, and other organisms thrived, their reign would come to an end at the [[Cretaceous–Paleogene boundary]] (which was formerly known as the K-T boundary). In an instant, millions of species were obliterated by a meteor impact in Mexico's [[Yucatán Peninsula]]. While this extinction led to the demise of the dinosaurs and other organisms, some life did prevail to repopulate the earth as it recovered from this tremendous disaster. The uplifted mountains continued to constantly erode and, by 40 million years ago, the region was once again buried in material eroded from the central mountains.<ref name="ancientdenvers" />