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Black Canyon of the Gunnison National Park
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・ Black Canyon Wilderness Study Area (Gooding County, Idaho)
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Black Canyon of the Gunnison National Park : ウィキペディア英語版
Black Canyon of the Gunnison National Park

Black Canyon of the Gunnison National Park is a United States National Park located in western Colorado and managed by the National Park Service. There are three entrances to the park. The south rim entrance is located 15 miles (24 km) east of Montrose, while the north rim entrance is 11 miles (18 km) south of Crawford and is closed in the winter. The park contains of the long canyon of the Gunnison River. The national park itself contains the deepest and most dramatic section of the canyon, but the canyon continues upstream into Curecanti National Recreation Area and downstream into Gunnison Gorge National Conservation Area. The canyon's name owes itself to the fact that parts of the gorge only receive 33 minutes of sunlight a day, according to "The Black Canyon of the Gunnison." In the book, author Duane Vandenbusche states, "Several canyons of the American West are longer and some are deeper, but none combines the depth, sheerness, narrowness, darkness, and dread of the Black Canyon."
== Geology ==

The Gunnison River drops an average of through the entire canyon, making it the 5th steepest mountain descent in North America. By comparison, the Colorado River drops an average of through the Grand Canyon. The greatest descent of the Gunnison River occurs within the park at Chasm View dropping .〔(【引用サイトリンク】publisher=National Park Service )〕 The Black Canyon is so named due its steepness which makes it difficult for sunlight to penetrate into its depths. As a result, the canyon is often shrouded in shadow, causing the rocky walls to appear black. At its narrowest point the canyon is only wide at the river.〔
The extreme steepness and depth of the Black Canyon formed as the result of several geologic processes acting together. The Gunnison River is primarily responsible for carving the canyon, though several other geologic events had to occur in order to form the canyon as it is seen today.〔


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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