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本文论述了晋东南榆社一带的各期黄土。这里是黄土自西而东分布的过渡地带，黄土的性状有共性也有各自的特性。晋东南的黄土分为早更新世老Ｒ红土、早至中更新世新Ｒ红土、中更新世上离石黄土、晚更新世马兰黄土和全新世黄土。古地磁年代学测试和剖面观察获得的各期黄土年龄为：老Ｒ红土形成于２．５－１．５ＭａＢ．Ｐ，新Ｒ红士形成于０．９—０．６ＭａＢ．Ｐ，离石黄土形成于０．６—０．１ＭａＢ．Ｐ。它们彼此之间都有不整合面相隔。自Ｒ红土开始出现，就意味着榆社古湖开始消失，气候环境向半干旱－半湿润方向发展。但比黄土高原略为湿润，夏季风的影响更强些。
This article discusses each period of loess in the Yushe area of southeastern Shanxi. Here is the distribution of loess from the west to the east of the transition zone, loess common characters also have their own characteristics. The loess in southeastern Shanxi is divided into Early Pleistocene old R laterite, early Middle Pleistocene new R laterite, Middle Pleistocene Lishi Loess, Late Pleistocene Malan Loess and Holocene loess. Paleoterozoic geochronology test and section observation obtained each loess age: old R laterite formed at 2.5-1.5MaB. P, New R Reds formed at 0.9-0.6MaB. P, Lishi Loess formed at 0.6-0.1MaB. P. They are all intertwined with each other. Since the beginning of R red soil, it means that the ancient lake of Yushe began to disappear, and the climate and environment developed toward semi-arid and semi-humid. But slightly more humid than the Loess Plateau, the impact of the summer monsoon more.