Utah/Arizona: in Search of the Wave - paulsmit
’Pavement of giants.’

	Examining the surface of the Brain Rocks, which seems to be paved with enormous pentagonal stones, you feel like an archaeologist studying a long-lost world of giants.
The Brain Rocks can be found in Coyote Buttes nature reserve (in the Vermilion Cliffs Wilderness) and are made up by a 200 million years old geological formation called Navajo Sandstone. 
The polygonal jointing is the result from expansion and contraction of the rock near its surface where temperature fluctuations are most extreme. Photo Paul Smit