Discovery and study of the Early Pleistocene river and lake facies stratum in Bukedaban area of the western segment in the eastern Kunlun Mt.

A suit of the Early Pleistocene river and lake facies stratum is discovered in Bukedaban area of the western segment in the eastern Kunlun Mt. Its rock association is mudstone,sand gravel, mudstone with filling bioclast,not uncovered the fundus, the Last Pleistocene stratum covered its top. The dating of ESR and Pal.show its era correspond to the Early Pleistocene, the era of the Qigequa Formation in the Qaidam basin and the Qiangtang Fromation in the narrow mountain pass the eastern Kunlun Mt. This discovery shows particular direction significance for analysis the Early Pleistocene climate evolvement and up-lift in the erea and the border upon erea.