<--- Back to Details
| First Page | Document Content | |
|---|---|---|
 Date: 2007-04-03 15:11:39Alluvium Geology of the Grand Teton area Geology of the Death Valley area Geology Petrology Sedimentary rock |
Add to Reading List |
| First Page | Document Content | |
|---|---|---|
Date: 2007-04-03 15:11:39Alluvium Geology of the Grand Teton area Geology of the Death Valley area Geology Petrology Sedimentary rock |
Add to Reading List |
1 Basement Rocks The metamorphic basement rocks that were formed about 2.5 billion years ago in the Archean Eon. These igneous rocks are radioactive age measurements that indicate the ages of 1,690 million and 2,540 mil