资料表明，黄土高原约160万年以来发生了6次构造侵蚀期，各次侵蚀期下切深度存在差别，深度变化一般在5～130m之间。
Material shows that the tectonic erosion periods occurred six times since 1.6 Ma . B.P. The depth eroded by each tectonic erosion period was different , it varies generality between 5 and 130 m.
侵蚀下切