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 ...

The Grand Canyon is the deepest erosion furrow on the surface of our planet. ... The predominant formation is Vishnu Schist, 1.8-billion-year old rock from the basement of time.

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, ...

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

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.

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, ...