Tim Fitzharris / Detail of The Wave, a Navajo sandstone formation in Paria Canyon-Vermilion Cliffs Wilderness, Arizona

Tim Fitzharris / Detail of The Wave, a Navajo sandstone formation in Paria Canyon-Vermilion Cliffs Wilderness, Arizona

Yva Momatiuk & John Eastcott / Vermilion Cliffs near Marble Canyon, spring cumulus clouds, northern Arizona

Yva Momatiuk & John Eastcott / Sandstone mushrooms formed by harder sandstone on top eroding slower than the base, Vermilion Cliffs, evening, northern Arizona

Gerry Ellis / Wind sculpted Colorado sandstone, Paria Canyon, Vermilion Cliffs Wilderness, Arizona

Gavin Hellier / Vermillion Cliffs NM Paria Canyon Arizona USA