Atlas Obscura
The Great Chamber in Kanab, Utah
Utah’s Great Chamber, a sandstone alcove over 200 feet wide, is the awe-inspiring result of millions of years of wind and sand shaping rock. The Chamber was created when erosion ate into the side of a Navajo sandstone cliff formed from dunes 180 million years ago in the Jurassic period. The key geologic factor here is "differential erosion," in which softer rock erodes quicker than the surround…