Abstract: Based on the authors’ study on the original-define ‘Xingmincun Formation of Sinian System’， the characteristics of the glacial period environment were found in the fine grain quartz sandstone in the bottom of Zhoujiawaizi section of Xingmincun Formation， such as ice-rafting dropstone and fine laminary structure. In the bottom and upper part of Zhoujiawaizi section there are ice crystal impression and hailstone traces and other moraine traces. The Wangjiatanzi shale section of the original-define Xingmincun Formation belongs to the shallow sea facies open shelf subfacies sedimentary environment， producing different species of the medusa-like fossil which belong to the Sinian system. The structure of the medusa-like fossils produced in this layer is simple and small and the formation time should be earlier than that of Ediacaran. The Gandaozi limestone section of Xingmincun Formation belongs to the internal carbonate deposit. In view of the above research results， the authors consider that the sedimentary environment of the Zhoujiawzi sandstone， Wangjiatanzi shale and Gandaozi limestone of the original-define Xingmincun Formation is obviously different. It is necessary for original division of Xinmincun Formation to be disintegrated and divided into Zhoujiawaizi Formation， the Wangjiatanzi Formation and the Gandaozi Formation in the upper series of the Nanhua System. It is beneficial to the comparison and study of lithostratigraphy units in the late Neoproterozoic in China.

Key words: Xingmincun Formation of Sinian System, ice-rafting dropstone, lamellar structure, ice crystal impression, hail crystal impression, medusa-like fossil