更新世晚期。由于新构造的差异升降，旱峡成为西江在这一带第一次改道的中期古河道。
Due to the differential neo-tectonic lift and fall at Late Pleistocene Epoch, Xijiang River changed its course for the first time in the Dry Gorge.
结果表明，1950年代末至1970年代前期，这一带地区以旱为主，3个重旱年有2年出现在这个时段内；
It shows that droughts are popular from the end of 1950s to early 1970s, 2 of the 3 most heavy years occur during this period.
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