Abstract: A succession of Jurassic strata is recognized in Ringtor in the south-central part of the surveyed area in Xizang, resulting in the establishment of the Ringtor Formation. The Quaternary volcanic rocks crop out over a wide area of the western part of the surveyed area. The the formerly Mangxiang Formation is redelineated, and the formerly Selepug Group is dismembered into the Miocene Bugasi Formation and Quaternary Selepug Formation. The subdivision has been finished for the Lunggar massif in which old gneiss enclaves (xenoliths) are observed.