The Grade IV terraces are developed on the right bank of the Kunlun River near Sancha River Bridge, and the Grade V terraces are partially visible. Grade I terraces are 3m above the surface of the river. It is the alluvial sandy gravel layer with sand lens that has been deposited since the Holocene about 11,700 years ago. Grade II terraces are 5m above the river surface and consist of alluvial sandy gravel layer from the Holocene. Grade III terraces have a 3.5 m profile exposed, which is the alluvial gravel-clad clay and fine-sand lens from the late Pleistocene about 100,000 years ago. The exposed profile of Grade IV terraces is 7.1 m high and consists of gravel layers. The development of Grade IV terraces and changes in the height of terraces at all levels reflect the dramatic uplift of the Tibetan Plateau since the late Pleistocene. There were at least four intermittent uplifts along the Sancha River, each with an unequal rise, suggesting that the crust rises with an unbalanced trend.
Administration of Mount Kunlun National Geopark, Golmud, Qinghai
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