The region where the Grand Canyon now lies begins to shift ... At the very bottom of the canyon lies the Vishnu Schist, a hard rock originally deposited mainly as sediments some 2 billion years ...
The Grand Canyon is the biggest canyon on earth: 277 miles long, 10 miles wide, and a mile deep. It contains some of the oldest exposed rock on earth, Precambrian Vishnu schist, formed 1.7 billion ...
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8 Most Incredible Discoveries In Grand Canyon National ParkSpanning over 277 miles, the Grand Canyon National Park ... the Great Unconformity between the 1.7 billion-year-old Vishnu Schist and the 270–530 million-year-old Layered Paleozoic Rocks.
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