’Coyote Buttes nature reserve.’
The strange landscape of Coyote Buttes nature reserve (in the Vermilion Cliffs Wilderness) is made up by a 200 million years old geological formation called Navajo Sandstone. It is composed primarily of wind-blown sand from a vast ancient desert. Minerals of iron oxide, deposited by groundwater after the accumulation of the sand, have created red, orange and yellow colours. The light dome-like structures in the foreground are locally called "Brains Rocks". Photo Paul Smit & Mick Palarczyk.