From Menozoic era to early Cenozoic era(E_(1)and E_(2)) the separate fault block was very evident in west of the basin ,but in north there were a lot of setting basins.

• 中生代到古近纪(古新世和始新世)盆地西部以分隔性断块发育为特征,北缘则主要为沉降拗陷群。