penecontemporaneous erosion

On the basis of the materials in the paleogeographLoess Plateau,the chronology of loess strata,eroding periods and depositing periods,the plateau of red earth which prevailed before the occurrence of Loess Plateau is ascertained,and four developmental stages of Loess Plateau are pided since 2.

根据黄土高原古地理演变、黄土地层年代学和侵蚀期与堆积期的资料分析，得出黄土高原出现之前为红土高原，２５０万年来的黄土高原可分３个阶段。