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 ...

The Vishnu schist — the Grand Canyon’s 1.7 billion-year-old “basement layer” — was veined with pink stripes of Zoroaster granite. Near miles 117, we came to Elves Chasm, ...

Why I Love the Grand Canyon. This wonder is transcendently beautiful, ... multicolored walls of the canyon, with the Vishnu schist at the bottom dating back an astounding 2 billion years ...

At the very bottom of the canyon lies the Vishnu Schist, a hard rock originally deposited mainly as sediments some 2 billion years ago. The layer was subsequently covered.

GRAND CANYON NATIONAL PARK — There are six of us, all women, sitting in the dusk about 1,300 feet above the Colorado River. ... a looming wall of Vishnu schist, ...

Around 1:30 P.M. the party approached the top of Bedrock rapid, a perilous stretch of whitewater where the river is divided by a hulking island of Vishnu schist, the Earth’s oldest exposed rock.

Explore incredible discoveries in Grand Canyon ... Geologist John Wesley Powell identified the Great Unconformity between the ...

The Vishnu schist — the Grand Canyon’s 1.7 billion-year-old “basement layer” — was veined with pink stripes of Zoroaster granite. Near miles 117, we came to Elves Chasm, ...