In a land where rivers come at a premium, the Colorado is locked away in a granite prison. A prison of creosote and cactus. Although the rim of the canyon lies in the Canadian and Hudsonian life zones, the desert heart of the Canyon is pure Lower Sonoran desert. All that is missing are a few saguaro cactus to make me feel right at home. The walls of this desert prison are made of Vishnu Schist. Well, calling the rocks a "schist" is just a snobbish term for any metamorphic rock that can be split into thin layers. Vishnu Schist sounds so much more mysterious and romantic than blue slate, which is what it is. Above the Vishnu Schist lie the Brahma and Rama Schists. It really sounds like the early geologists had overly active imaginations.
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