Existing comment:
A Complex Fault: 70 million years ago:
Look out the window. Across the valley, the gray rocks you see are much older than the red ones, and until about 70 million years ago, the gray materials lay deep below them. Then compression caused by the interaction of plates off California caused the earth to move, here and the natural order was reversed. This thrust is a very complex fault which geologists still don't understand fully. |