Remarkable Finds Indicate ancient People Migrated From Orient

The Grand Canyon is a mile-deep gorge in northern Arizona. Scientists estimate the canyon may have formed 5 to 6 million years ago when the Colorado River began to cut a channel through layers of rock. Humans have inhabited the area in and around the canyon since the last Ice Age. The first Europeans to reach the Grand Canyon were Spanish explorers in the 1540s. President Benjamin Harrison first protected the Grand Canyon in 1893 as a forest reserve, and it became an official United

Where Is the Grand Canyon?

The Grand Canyon is located in northern Arizona, northwest of the city of Flagstaff. The canyon measures over 270 miles long, up to 18 miles wide and a mile deep, making it one of the biggest canyons in the world.

This natural landmark formed about five to six million years as erosion from the Colorado River cut a deep channel through layers of rock.

The Grand Canyon contains some of the oldest exposed rock on Earth. The mile-high walls reveal a cross section of Earth’s crust going back nearly two billion years. These rock layers have given geologists the opportunity to study evolution through time.

The oldest known rocks in the canyon, called the Vishnu Basement Rocks, can be found near the bottom of the Inner Gorge. The Vishnu rocks formed about 1.7 billion years ago when magma hardened and joined this region—once a volcanic ocean chain—to the North American continent.