The tectonic events at 1.7～1.2 and 0.93～0.84 Ma BP folded the Yumen Conglomerate into the anticline, and the one at 0.16 Ma BP tilted the Lower Jiuquan Gravel. The alluvial fan constructed by the Upper Jiuquan Gavel is covered by loess sequence since S1, indicating the downward incision from the fan at about 0.13 Ma BP.
Based on modern tectonic theory, the authors believe that this conglomerate is a product of middle-late stage sedimentation during a compressional orogeny.