The formations from the 1st member of Shanxi formation to the upper 8th member of Xiashihezi in Permian, Neopaleozoic are mainly sedimentary system of complex braided stream in Sulige area of Eerduosi Basin.

• 鄂尔多斯盆地的苏里格地区上古生界二叠系山1段至盒8上段主要为一种复杂的辫状河沉积体系。