sandstone

   Loosely speaking, sandstone is a rock formed by deposition (from wind or water) of sand grains that become cemented together over time.  It is composed mostly of quartz, and it can make for stunning, towering cliffs, and is frequently colored brownish, reddish, or pinkish.
   Around the Valley of the Sun, sandstone forms (in part) the west end of Camelback Mountain and the buttes in Papago Park.
   Much of the spectacular scenery of northern Arizona and southern Utah is made of sandstone.  The most massive formations there are the now-hardened remains of the dunes of a great Sahara-like desert that covered that part of the world during Jurassic time.

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