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| Don Taylor | profile | all galleries >> usa_travels >> Arizona/Utah Southwest Galleries >> Arizona Gallery >> Grand Canyon Arizona | tree view | thumbnails | slideshow |
| The Grand Canyon of the Colorado River is the largest gorge in the world-a 290-mile-long gash across the face of the Colorado Plateau in northern Arizona. Rim to rim, it measures up to 18 miles across, with an average width of 10 miles; its average depth is one mile. Within this Delaware-size area of eroded rock rise mountains higher than any in the eastern United States and that dark walls of gorges millions of years old. Agent of this scene, the Colorado River drops 2,200 feet over nearly 200 rapids as it roars through the Canyon toward the Gulf of California. At the canyon's bottom, a mile below the rim, the Colorado River slices through Granite Gorge, exposing some of the oldest rocks visible anywhere on the earth. Nearly two billion years old, the Vishnu schist is the gleaming black remnant of a once towering mountain range. Some 500 million years after it formed, vast rifting and faulting laid it down the tilted, colorful sediments of the Grand Canyon Series atop schist. Ten distinct layers of sandstone, limestone, and shale bespeak the advance and retreat of ancient seas, the building up and wearing down of mountains, the meandering of rivers over 600 million years. |
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 Grand canyon Kolb Studio |
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 Buckey O Nell Cabin. |
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