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徐宿地区平面上存在３个推覆构造带，剖面上有两个不同深度的滑脱层位。推覆构造受到两次构造运动的作用。早期滑脱为后缘推覆，前缘重力扩展、滑动；晚期滑脱为从东向西的推覆。构造变形机制表现为滑脱系统边缘为压剪、内部为挤压。
There are three nappe structures in the plane of Xu-Su area, and two skidding layers with different depths in the section. The nappe structure is subjected to two tectonic movements. Early slippage is the trailing edge of the thrust, the front edge of the gravity expansion, sliding; advanced slippage from east to west of the nappe. Structural deformation mechanism is shown as the edge of the slippage system is scissors, the internal extrusion.