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用氨基酸外消旋法对泥河湾层下部骨化石和蚌化石进行了年龄测定，获得２．７２．９、２．７８Ｍａ等年龄数据，结合古地磁探讨了泥河湾层底界及南沟冷期时代以及第四纪下限等问题。
Using amino acid racemization method, the ages of the fossils and clam fossils in the lower part of the Nihewan Formation were measured, and the age data of 2.72.9 and 2.78 Ma were obtained. Based on the paleomagnetic data, Period and the Quaternary lower limit and other issues.