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Keystone Canyon
Keystone Canyon is a gorge near Valdez in the U.S. state of Alaska. Situated at an elevation of , its walls are almost perpendicular. It measures in length, connecting the upper and lower valleys of Lowe River.
==Geography==
In Keystone Canyon, the mother rock of the country shows up to good advantage. It is all slate. Its cleavage is nearly vertical and easy to drill, except where small seams of quartz exist. The slate rock on the south side of the summit is firm and solid as a rule, but on the north side it is very much disintegrated. The bed of the canyon varies from in width. The vegetation growing on the low bottoms, consisting of grass, brush, and trees, indicates that, as a rule, the water does not rise more than in nearly the whole length of the canyon. Keystone Canyon is entered by going through a low pass in a spur divide, which forms the west side of the mouth of the canyon. The east wall is more abrupt than the west wall. There is but little side drainage to the canyon, and this is easily provided for by small culverts, with the exception of Waterfall Creek. This little stream forms a cascade with falls of several hundred feet in height, and finally buries itself in the loose rock at the base of the canyon wall. For a quarter of a mile, about the middle of the canyon, narrows are formed by the side walls being nearer together; there are abrupt walls in height. At the head of the canyon the river, dashing against a perpendicular wall of rock, is sharply deflected to the left for , and then gradually assumes its general direction, which it follows closely to the mouth of the canyon.
Horsetail Falls and Bridal Veil Falls are located within the canyon, as is the Richardson Highway. The Valdez-Eagle Trail passes through the canyon's south end.
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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