The last stage occurred in Late Cenozoic time (ca. 5Ma), dominated by differential uplift, caused by extension and isostasy due to change in climate.

 
  • 第4阶段始于晚新生代(5百万年),以差异性隆升为特征,其中,点苍山的隆升是构造成因,而哀牢山山体的形成可能与红河的下切相辅相成,有限的隆升是地壳发生均衡反弹造成的。
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