In one part of the upper reaches of the Madison River,a whole mountain began shifting,then came crashing down to fill the deep valley and dam the great river with millions of tons rock and trees.

• 在麦迪生河上游的一条支流处，一整座山开始移动，之后，它崩塌下来填满深深的山谷，上百万吨岩石和大树如坝般阻挡住大河。