Yanshanian deformation of the region is characterized by brittle faulting and sedimentary basin formation, which is closely related to the Tanlu Fault activity.

• 燕山期，受郯庐断裂构造活动的影响，区内断裂活动加剧，形成多期不同性质的脆性断裂及其所控制的沉积盆地(拗陷)。