In Triassic period, Qiangbei-Changdu area is a paraplatform area placed between Jinshajiang river oceanic basic and Bangong lake-Nujiang river oceanic basic.

• 摘要三叠纪，西藏羌北-昌都地区为夹持于金沙江洋盆和班公湖-怒江洋盆之间的一个准地台区。