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本文所述包括秦岭以北黄河以西六盘山以东及长城以南地区。本区主要的第四纪沉积物是黄土,现对黄土地层的划分提几点意见。
This article includes the area to the east of Liupan Mountain to the west of the Yellow River to the north of the Qinling Mountains and to the south of the Great Wall. The main Quaternary sediments in this area are loess, now the division of loess strata made some comments.