穿越美西北 06 - 从大提顿到黄石

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美国大提顿黄石国家公园旅游 |
分类: 美国行记 |
8月5日,Day 14,里格比Rigby –黄石公园Yellowstone 253 kms
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来,用一首The New Christy Minstrels的 Ambush at Teton Pass来应下景,大家要小心啦。data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7
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好在下了坡来就不再有这个问题了。
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一亿年前,在今天这些山脉形成之前,北美西海岸板块跟这里的沉积岩层碰撞,造成大量地震,这些地震造成今天的山脉隆起、谷地沉降。山顶和谷底的沉积岩虽然同宗同源,最终两者的高度差竟然有七千多米之多。
当然塑造地形不仅仅有隆起,还有侵蚀。二百万年前,巨大的冰川从黄石公园向南流动,充填了山谷侵蚀了山脉,并带来大量的岩石碎片。随着冰川填平谷底,高山冰川装点了大提顿各处,冰川融化形成今天到处遍布的湖泊。
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这里有观景台Glacier View Turnout远远地望山,观景台前的牌子上介绍说,在过去的40年里,眼前大提顿山顶冰川的面积缩小了25%,冰川反应了气候变化的情况。冰川就像一个冰冻的水库,在寒冷湿润的季节人们用水少的时候积聚冰雪,在温暖干燥的时候再将雪水融化注入河中。大提顿的雪水为野生动物提供了必要的栖息环境,
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牌子上还贴着张寻人启事,有一位十六岁的女孩失踪了,是自己徒步走丢了吗?遇到了狼或者熊了?data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7
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本篇涉及的路线如下,点击可见大图:http://yongyuandecaogen.com/wp-content/uploads/2017/01/剪辑.jpg06
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