252 STRUCTURAL GEOLOGY OF NORTH AMERICA 



helped in the burial process. Jurassic desert conditions brought great the early Upper Cretaceous before the last peaks were drowned. See 



volumes of wind-transported sand from the western Cordilleran geanti- Fig. 15.14. Ry this time the early manifestations of crustal unrest in the 



cline. Rocky Mountains are evident, and the old buried ranges with over- 



The Zuni and Pedernal uplifts were buried by the Permian deposits, tying sediments were considerably deformed. An array of new super- 



the Uncompahgre lasted in a number of small islands until late Jurassic posed structures and ranges developed, which will be reviewed in later 



before final burial, and the Colorado Range lasted until Pierre time in chapters. 



