Tectonic Evolution of Western North America |
 |
| ca. 30 - 25 MYA |
| As the edge of North America passed over the Pacific Spreading Center, strong granites of the Sierra Nevada lifted as a block, but did not fracture like thinner Basin and Range crust. |
Tectonic Evolution of Western North America |
|
| ca. 30 - 25 MYA |
| As the edge of North America passed over the Pacific Spreading Center, strong granites of the Sierra Nevada lifted as a block, but did not fracture like thinner Basin and Range crust. |