关键词: 黄土高原, 地质时代划分, 地层对比, 地层划分, 离石黄土, 年龄

Abstract: Based on the comprehensive analyses of the previous research on the loess stratigraphic classification in the Chinese Loess Plateau, and results from the three type loess/paleosol profiles, i.e., Luochuan, Baoji, and Xifeng, this article conducted detailed comparison and further subdivision of the loess strata in the Chinese Loess Plateau by using soil stratigraghy, sedimentology, magnetostratigraghy, paletontology, chronology, and geochemistry. This article adjusted the boundary of the Early Pleistocene and the Middle Pleistocene to the top of L9, which corresponds to the start time of the B/M polarity boundary, divided the Lishi Loess into three parts according to the difference in lithology and climate cycle periods, and added S8/L9 as a new boundary. As a result, S1-L5 are in the upper Lishi Loess, S5-S8 are in the middle Lishi Loess, and L9-L15 are in the lower Lishi Loess. A new problem arises that the ages of some key horizons such as the S0, L1, S1, S5, L9, L15 and L33 are different among these profiles.

Key words: Chinese Loess Plateau, geological age division, strata contrast, strata division, Lishi Loess