三叠纪薄板状灰岩在强烈逆冲推覆作用下，形成平卧紧闭尖棱褶皱。褶皱枢纽呈水平或近水平状倒转平卧，转折端尖棱状，两翼近对称。三叠纪薄板状灰岩距今2.5亿至2.03亿年。

  Triassic laminated limestone formed recumbent closed angular foldunder the action of a strong thrust nappe. Fold hinge appears to be horizontal or near horizontal inverted recumbent, angular shape turn end, and two wings are nearly symmetric. Triassic lamellar limestone is 250million to 203million years ago.