There is a evolutional phenomenon to have been recognized in shaanbei loess plateau from south to north. that is luochuan district with the loess yuan ( platform land ) in south. yan ' an - an ' sai district with the loess liang ( ridges ) mainly in middle and shunde - mizhi district with the loess mao ( rounded knolls ) mainly in north. this frame and tendency is got and thought to coincide with the styles of their bedrock traditionalh ? called conformability
在長期的研究和調查過程中，發現陜北黃土高原在南北縱向上存在明顯的黃土地貌分異現象，即由南向北，大致依次為洛川黃土塬（廣義）地貌、延
安?
安塞黃土梁狀（為主）丘陵溝壑地貌、
綏德?子洲黃土峁狀（為主）溝壑地貌。
The unconformability between the loess landform of shaanbei loess plateau and its bedrock shape was pointed out first after the full demonstration. the top of loess formation of the south part in shaanbei is flat which likes " platform ", the shape of the bedrock is rolling that likes ridge, and the bedrock bended to fold. the top of loess formation of the mid - part in shaanbei is rolling, but the shape of the bedrock below begins to get flat, the top of loess formation of the north part in shaanbei, loess mao district, is much more rolling among them, however, its shape of the bedrock below is the flattest relatively likes the platform shape of loess formation in south
具體地講，陜北高原南部的洛） 11黃土源，黃上層頂部相對平坦，地貌類型以黃土源為主格調，而其下伏基巖地層詔皺相對發育，古地勢起伏相對較大：陜北高原中部的延安一安塞黃土梁狀（為主）丘陵溝壑區，黃土層頂部起伏相對增大，地貌類型以黃土梁為主格調，而其下伏基巖地層槽皺程度趨弱，地層較平緩，古地勢起伏相對降低；陜北高原北部的綏德一子洲黃土赤狀（為主）丘陵溝壑區，黃土層頂部起伏度相對最大，地貌類型以黃上赤為主格調，而其下伏基底地層以平緩為特徵，古地勢起伏強度亦相對較低。
