Grand Canyon Geology Diagram from Wikipedia
 

GRAND CANYON ROCK LAYERS THAT ARE SEEN ALONG THE COLORADO RIVER:


ROCK                        AGE(MY)

Kaibab Formation                                270

Toroweep Formation                           273

Coconino Sandstone                           275

Hermit Shale                                         280

Supai Formation                                   315-285

Redwall Limestone                               330

Temple Butte Limestone                      385

Muav Limestone                                    505

Bright Angel Shale                                515

Tapeats Sandstone                               525

Cardenas Basalt                                    1250-1100

Dox Sandstone                                       1140

Shinumo Quartzite                                  1195

Hakatai Shale                                           1200

Bass Limestone                                       1254

Grand Canyon Metamorphic Complex   1750-1680

(Vishnu Schist and Zoroaster Granite)

 
Made on a Mac

THE GREAT UNCONFORMITY: 

One of the great geological features of the Grand Canyon is The Great Unconformity.  An unconformity is a gap in time between two rock layers where no rock layer is preserved.  The Great Unconformity is found between the Vishnu Schist and the Tapeats Sandstone.  It is so incredible because: 

1.  It represents a gap of 1.2 Billion Years

2.  The gap is found      throughout the world. 

  1. 3. It divides rocks with familiar fossils with those that have no fossil bacteria or no fossils at all.









My Favorite Grand Canyon Geology  Webpages:

  1. 1.MESA COMMUNITY COLLEGE

  2. 2.GRAND CANYON NATIONAL PARK

  3. 3.WAYNE RANNEY PAGE

  4. 4.WIKIPEDIA

  5. 5.BOB’S PIXELS


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