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Arch Otolaryngol Head Neck Surg. 2008;134(1):7.

Photographer: Philip B. Zald, MD, Portland, Oregon. Spires called "hoodoos" are visible in this photograph, taken from an overlook at the rim of Bryce Canyon in January 2007. These form when ice and rainwater erode the limestone that makes up the Claron Formation, a rock layer that formed in an ancient lake that covered much of western Utah 40 million years ago.