The P 1 x - s Formation of Permian in the northern Hangjinqi area was characterized by major litharenite of braided river and meandering river facies,and overlain on the metamorphic crystalline basement of Archean.

• 鄂尔多斯盆地北部伊盟隆起杭锦旗地区二叠系 P1 x - s直接覆盖在太古界变质结晶基底之上 ,为一套辫状河沉积和曲流河沉积砂岩。 砂岩以岩屑砂岩为主。