3) Left-lateral shear in Late Cretaceous period, leading to folding of Jurassic and Early Cretaceous sediments, which are unconformable with upper layers;

• (3)晚白垩世，为北东向左行剪切构造应力场，区内侏罗系和早白垩世早期的沉积物发生褶皱，与上覆地层呈明显的不整合；