As I look out the window at a tree-covered mountainside, I have to remember that under that layer of vegetation, there are rocks and sand and gravel that were deposited millennia ago by the giant Lake Bonneville. In the image above, you can easily see the layers silt and clay that were deposited millions of years ago. At the base of the cliffs, you can see piles of eroded sand and clay that pile up and are then carried away by water and wind.
No comments:
Post a Comment