石英砂岩由于地壳缓慢性间歇抬升，形成丘陵山地，在流水侵蚀、重力崩塌作用下形成峰墙。峰墙在风化作用下，下部岩层坍塌，构成凌驾于两峰之巅，气势恢宏的天然石桥，又称“天下第一桥”。Because of the slow intermittent uplift the earth’s crust, the quartz sandstone strata formed a hilly and mountainous area. Water erosion and gravitational collapse formed the peak dyke. Under the effect of weathering the lower part of the dyke collapsed, thus this magnificent natural bridge was formed.