09:41 And, right at the bottom, you find the granddaddy of Grand Canyon rocks, granodiorite. This rock is more than 4,000 feet below the rim of the canyon, and it's one of the oldest rocks of them all.
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The earthquake of May 22, 1960, that struck the town of Valdivia in southern Chile is the most powerful ever recorded and has become known as the Great Chilean Earthquake. It is thought to have measured 9.5 on the moment magnitude scale (MMS).
The composition (sandstone) and presence of stromatolites indicate that this area was previously a very shallow sea. The rock layers in the Grand Canyon Supergroup have been tilted, whereas the other rocks above this set are horizontal.
Over a billion years ago, what is now the Grand Canyon was underwater. It was covered by an ancient ocean that was home to numerous prehistoric animals. Tiny pieces of rocks and soil called sediment were deposited in layers, along with volcanic rocks.