Geology of the Grand Valley

HOW WAS OUR REGION FORMED?

GV strat column

 

In ancient times, oceans and then deserts covered western Colorado. Their retreat left great deposits including sand, which compressed into sandstone. To the west of Grand Junction, the red sandstone has weathered into the canyons and elaborate formations of the Colorado National Monument. East of the Grand Valley is the vast, flat-topped Grand Mesa. Volcanic flows had covered that area, forming a protective layer of hard basalt, hundreds of feet deep. The surrounding terrain eroded away, leaving the Grand Mesa with its 10,000′ elevation, forests, and lakes.

 

Click image for full size.

Comments 1

  1. Pingback: 68 million dinosaur fossils Colorado years triceratops Scientists - Fhaloansdenver

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.