A compressional tectonic setting occurs in the early episode of Middle Jurassic, which is characterized mainly by occurrence of piedmont thrust-compressional basins and thrusts at basinal margin.

• 中侏罗世初期为挤压环境，形成的主要地质要素是山前冲断收缩盆地及盆地边缘的逆冲断裂。