They call these the Chalk Cliffs. This area has hot springs, which caused a chemical reaction that created the chalky-looking rocks, resulting in various features being named after their chalky appearance. Chalk Creek runs down through Chalk Creek Canyon, and there’s a Chalk Lake too.

But there is no chalk… The cliffs are made of a soft, white clay mineral called kaolinite, not chalk, which is a limestone (calcium carbonate) deposited in a sea. In the picture you can see Mount Antero, 14,269 ft. (left) and Mount Princeton, 14, 204 ft. (right, behind Tiger Peak).

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