The beach and bar complex was reformed and transported by waves, and deposited on the on the top of and around the underwater buried hill at last,because of the lower water power and small scale of the basin.

沙四上亚段沉积时期湖盆范围较小、水动力条件相对较弱,砂质滩坝主要是通过湖浪对来自周缘扇三角洲沉积物的改造与再搬运而形成,并沿着桩西水下潜山高部位和周缘滩坝发育。

Qianmiqiao buried hill in Banqiao structural belt of HuanghuaDepression was formed by stretch-faulting on the basis of fold-obduction.

千米桥潜山构造位于黄骅坳陷北大港构造带，千米桥潜山构造是在中生代的褶皱-逆冲作用的基础上经历伸展正断作用后形成的。