New views on age of the Salawusu Formation of Late Pleistocene in northernChina

The Salawusu Formation in the Salawusu River basin of Inner Mongolia is a t ypical sequence of the Upper Pleistocene in northern China. However, there have been some different views about the division and age of stratigraphic facies since the establishment of the Salawusu Formation. According to the stratigraphic subdivision and dating of the Dishaogouwan section, it is tho ught that the fluviolacustrine-aeolian sand sequence from the Dishaogouwan section can be compared with loess, deep-sea deposit records and climatic f luctuations of glacial period. The Salawusu Formation of fluviolacustrine f acies was formed in the last interglacial period from 140 to 70 ka BP, roug hly corresponding to the fifth stage of deep-sea oxygen isotope, and develo ped in the same period as the palaeosol S-1 on the Loess Plateau; the aeoli an sand of the Chengchuan Formation was formed in the last glacial period f rom 70 to 10 ka BP, constituting the heteropic geological body along with t he Malan Loess on the Loess Plateau; the fluviolacustrine deposit and black soil of the Dagouwan Formation and the Dishaogouwan Formation was formed i n the Holocene warm period from 9 700 to 3 000 a BP, or developed in the sa me period as the plaeosol S-1 on the Loess Plateau.