Hoodoos are tall, skinny spires of rock that protrude from the bottom of arid basins and 'broken' lands. Formed in sedimentary rock, the shape of a particular hoodoo is affected by the erosional patterns of alternating hard and softer rock layers. The Claron Formation is the rock layer where hoodoos form at Bryce Canyon NP. This layer includes siltstones, mudstones and especially limestone that was created 30-40 million years ago when an ancient lake covered most of western Utah.
U.S. National Park Service
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