Late Cretaceous to Early Tertiary uplifts similar in structure to the Kaibab Upwarp are common to the entire Colorado Plateau and are associated with deep crustal uplifts to the east that formed the Rocky Mountains (A); compression and folding of the sedimentary cover occurred during the Laramide Orogeny (B), just a portion of the tectonic upheaval affecting western North America form about 165 million years ago to the present day.