Where can We See over 1500 Million Years Old Rock Strata?

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The Grand Canyon is the only place on the Earth where one can study so many layers of undisturbed rock and an almost perfect sequence of fossils. The Colorado River has carved this deep gash in the Earth's surface. The canyon crosses a desert in Arizona, a state in the west of the United States. The canyon is about 350 km deep. This is the deepest gorge anywhere on land. The rocks at the bottom on the Granite gorge were formed 1700 million years ago. They are buried under Tapeats Sandstone, and are 570 million years Old. At the top, on the rim of the canyon is the Kaibab Limestone about 270 million years old.

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