The central nappe zone is divided into seven nappes, which have an appearance of horizontal scaly imbrication and vertical thruSt overlap,and thus form a seometric model of scaly imbrication.

• 各推覆体在平面上呈鳞片状越覆，在剖面上呈送冲叠覆，构成鳞片叠覆的几何模式。