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榆社组的标准剖面,是三十年代初期杨钟健、德日进(Teilhard dechardin,P.)等人在晋中南一带进行新生代地质调查时提出的.那时他们依据古脊椎动物化石资料将其划分为上、中、下三段,并将它们全都划归上新世.1948年根据第十八届国际地质学会建议,将上段改划归下更新世.因此,这个最初的调查过程,就是建立和划分上、中、下榆社组的过程.嗣后,在几十年的时间里,尽管先后有不少科研、教学、生产单位在晋东南一带进行了不同课题的调查研究,也提出了许多新资料,并有所发现,但是,对榆社组的时代划分(见表1),仍是维护三十年代的最初看法.
The standard profile of the Yushe group was put forward by Yang Jijian and Teilhard dechardin (P) during the Cenozoic geological survey in Jinzhongnan area in the early 1930s when they used the data of ancient vertebrate fossils Divided into upper, middle and lower three, and all of them are classified as Pliocene .In 1948 according to the eighteenth session of the International Geological Society, the reorganization of the upper reaches of the Pleistocene .Therefore, this initial investigation process is In the next few decades, although there have been many scientific research, teaching and production units in the southeastern area conducted a survey of different topics, but also put forward A lot of new information was found, but the classification of the Yushe period (Table 1) is still the initial view to maintain the 1930s.