when did the colorado river start to form the grand canyon
Grand Canyon Nearly two billion years of Earth's geological history have been exposed as the Colorado River and its tributaries cut their channels through layer after layer of rock while the Colorado Plateau was uplifted.[4] While some aspects about the history of incision of the canyon are debated by geologists,[5] several recent studies support the hypothesis that the Colorado River established its course through the area about 5 to 6 million years ago.[1][6][7] Since that time, the Colorado River has driven the down-cutting of the tributaries and retreat of the cliffs, simultaneously deepening and widening the canyon.
Paris Peace Accords
Grand Canyon James Ohio Pattie, along with a group of American trappers and mountain men, may have been the next European to reach the canyon, in 1826.[26]
Navajo Archaeological and historical evidence suggests the Athabaskan ancestors of the Navajos and Apaches entered the Southwest around 1400 CE.[7][8] The Navajo oral tradition is said to retain references of this migration.[citation needed]