he Shuangxi deposition is made of detritus and distributed abroad along the upper reach of the Dalinghe river. It has close relations with rockfalls, landslide and debris flows. At Shuangxi village, Zhongba village and Shenjiping village along Daninghe river, the mudstone and siltstone rocks of the Silurian age are soft and can be easily weathered. They are distributed at the lower and gentle slopes. The limestone of the Permian and Triassic age are distributed at the upper and steep slopes. It is hard and solid. The Shuangxi deposition spreads in the foot of the mountains.