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Little Yosemite Valley : ウィキペディア英語版
Little Yosemite Valley

Little Yosemite Valley is a smaller glacial valley upstream in the Merced River drainage from the Yosemite Valley in Yosemite National Park. The Merced River meanders through the long flat valley, draining out over Nevada Fall and Vernal Fall before emptying into the main Yosemite Valley. It can be reached by a day hike from the main valley, and is the most popular area in the Yosemite Wilderness.〔(【引用サイトリンク】title=Half Dome and Little Yosemite Valley )〕 The Valley provides access to nearby destinations such as the back side of Half Dome, Clouds Rest and the High Sierra Camp at Merced Lake.
Little Yosemite Valley is a tread on the glacial stairway of the Merced River that runs from Yosemite Valley up to Mount Lyell, gaining some of vertical elevation over and is situated some in elevation above Yosemite Valley proper.〔
==Geology==

The north wall of Little Yosemite has not been subject to the same kinds of glacial planing as the south wall because the granite rocks of Moraine Dome and Sugar Bowl Dome are tougher and more resistant. This is remarkable considering that it is likely that Little Yosemite was not only scoured repeatedly by glaciers that were wholly contained by the canyon, but also overrun by glaciers that overflowed the Merced canyon and spread widely into surrounding uplands with occasional surges of ice contributed over the pass from the overflowing Tuolumne River basin. These rocks were thus subject to tremendous gravitational and flow forces yet retain a remarkable degree of integrity, eroding almost exclusively and superficially along exfoliation joints.〔
The south wall of the valley has been subject to extensive glacial planing, with all jointed granite completely smoothed away, leaving a stark, featureless unjointed sheer cliff face, as is apparent in . The west end and south wall of the canyon are "exceptionally massive, few cliffs anywhere in the Yosemite region exhibit a more complete absence of fractures."〔 This also leads to an almost complete absence of vegetation as well, as there are few opportunities for roothold. The north wall in contrast, and similarly to the north wall of Yosemite Valley, has been subject to much less glacial planing and is much more differentiated and vegetated.〔

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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