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Royal Gorge
The Royal Gorge (also Grand Canyon of the Arkansas) is a canyon on the Arkansas River near Cañon City, Colorado. It begins at the mouth of Grape Creek a mile upstream from downtown Canon City and continues upstream for approximately ten kilometers. With a width of 50 feet (15 m) at its base and a few hundred feet at its top, and a depth of 1,250 feet (380 m) in places, the canyon is a narrow, steep gorge through the granite of Fremont Peak. It is one of the deepest canyons in Colorado.
==Natural history==
The path of the Arkansas River was already set when the granite uplift that would eventually form the Rocky Mountains began. About 3 million years ago as the mountains began to rise from the surrounding plains, the Arkansas River – then only a small rivulet – began to wear away at the stone it flowed across. Scientists estimate that the mountains surrounding the canyon rose at a rate of approximately one foot every 2500 years. Over the millennia, this small stream grew, cutting a deep channel for itself through the surrounding granite. The gorge's peculiar shape, contrasted to broad canyons such as the Grand Canyon, can be attributed to this long, direct erosion through hard rock.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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