According to (1) its distribution, sedimentary characters, geomorphic place, (2) the evolution of the Songliao Divide in the Quaternary Period and (3) the evolution of the Songliao drainage system, we think the genesis of the strata is alluvial sediments, though it used to be regarded as glairo--fluvial sediments, its sedimentary age is the early time of the early Pleistocene (Q1 ), though it.

The lithic assemblage was discovered from the fluvial deposit belonging to the Lower Pleistocene context in 1960.

Most of the surface of the plateau rose above the cryosphere in early Middle Pleistocene with intense deformation taking place in the plateau region during global ice ages.