Till to the Late Triassic, except the west part of the Center Uplift, the Qiangtang Basin was covered with water owing to the spreading of Bangonghu-Nujiang Ocean.

• 至晚三叠世，受班公湖-怒江洋扩张作用的影响，除中央隆起带西段继续遭受剥蚀外，羌塘盆地普遍接受沈积。