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Atlas Obscura - Latest • Feb. 5, 2026, 5:15 p.m.
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 surrounding harder rock, enabling wind and floods to scoop out a massive hollow in the cliff face. The wind also blew sand into the alcove's floor, creating a huge dune that fills much of the interior.
Visitors who have returned to the Chamber years later say that the sand-scape continues to slowly change, shifting and reshaping. The smooth, pale sandstone of this cathedral-like structure changes color with the sun's angle, almost glowing in off-whites, soft pinks and yellows when the sun is brightest.
The key geologic factor here is "differential erosion," in which softer rock erodes quicker than the surrounding harder rock, enabling wind and floods to scoop out a massive hollow in the cliff face. The wind also blew sand into the alcove's floor, creating a huge dune that fills much of the interior.
Visitors who have returned to the Chamber years later say that the sand-scape continues to slowly change, shifting and reshaping. The smooth, pale sandstone of this cathedral-like structure changes color with the sun's angle, almost glowing in off-whites, soft pinks and yellows when the sun is brightest.
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