The 164,000-acre monument contains the highest known density of archaeological sites anywhere in the U.S, according to the BLM.
American West Archaeology & Paleontology
Tucked away in remote Tsegi Canyon, the monument surrounds a small desert oasis, a place abundant in plant life, with mountain mahogany, Gambel oak, serviceberry, rice grass and Douglas fir scattered across the canyon.
The fossil nests, dating to about 220 million years ago, are similar to modern-day crocodile and turtle nests.
Columbian mammoths ranged over much of what is now the southern United States and Mexico up until the end of the last Ice Age, when they became extinct.
During the summer, Navajo families still live and farm the bottoms of Canyon de Chelly, Canyon del Muerto and Monument Canyon, all of which make up Canyon de Chelly National Monument in northeastern Arizona.