Undulating Stone Wilderness, Arizona

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This photograph shows ancient petrified sand dunes that have been eroded by wind and rain to expose the extremely unique and varied layers. This Navajo sandstone is approximately 190 million years old. The thin layers are soft and fragile. At the edge of every exposed layer is a tiny undercut that will flake off when stepped on. If you discover a place like this please walk very carefully. Those who feel the need to climb like monkeys on every climbable thing should save these urges for less unique and fragile surroundings.