At the earliest Paleogene , Tibet-Tethys was closed down ,causing the forming of the southern Tibet peripheral foreland basin system.

• 从古近纪初开始,西藏特提斯关闭,形成周缘前陆盆地体系(由褶冲带、前渊带、前隆带和隆后盆地等单元构成) 。