Paleocene-Miocene strata in the Qaidam Basin to the north of the Kunlun Mountain and the Kekexili Basin to the south of the Kunlun Mountain show similarities in sedimentary, paleontological, palaeoclimatic, and tectonostratigraphic features. Based on these data, the authors believe that the Kunlun Mountain that today separates the Qaidam Basin and Kekexili Basin was subdued during the Oligocene-Miocene. The authors also believe that the Kunlun Mountain must have experienced long-term weathering and erosion after its uplift in the middle Indo-China movement. But during the Paleocene-Miocene, the mountain may have been eroded continuously and then in the Oligocene-Miocene, the ancient mountain essentially disappeared.