During the period from Late Oligocene to Middle Miocene, the basin changed from rifting to depression, and the depositional area continued to expand in the Marine environment.

晚渐新世—中中新世，盆地逐渐由断陷转为断拗，沉积范围不断扩大，整体处于海相沉积环境。

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During the period from Late Oligocene to Middle Miocene, the basin changed from rifting to depression, and the depositional area continued to expand in the Marine environment.

晚渐新世—中中新世，盆地逐渐由断陷转为断拗，沉积范围不断扩大，整体处于海相沉积环境。

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