The listric normal faults in the south of Nanyang Sag glide on lumpy surface and result in the gentle wrenches of cap formation in the north,serving as the boundary between depositional regions.

• 南襄盆地南阳凹陷南部控凹铲状正断层在非平面上滑动造成凹陷北部盖层缓坡弯折,构成盆内沉积区域的分界线,是同生断层集中发育和沉积相发生突变的地带。