At late Eocene, the Pacific Plate subduction direction were changed from NNW to WNW, and the development of Eocene fault depressions in the eastern part of the basin were controlled by dextral stresses.

• 始新世晚期；太平洋板块俯冲方向由NNW转为WNW；右旋应力场控制了盆地东部始新世断拗的发育.