一、序言细河群(钓鱼台组、南芬组、桥头组)、浑江群(万隆组、八道江组、青沟子组)具备衔接北方青白口系与南方震旦系的层序。而青白口系、震旦系又是国际上在晚前寒武系建立系一级地层单元的范畴。弄清细河群、浑江群的层位、时代以及在青白口系、震旦系中所处的位置,对我国南、北方晚前寒武纪地层的衔接,争取在国际通用的地质年代表使用震旦系一词有着极其重要的现实意义。细河群、浑江群的划分,顶底界线及对比方案在省内外还存在着不同意见:省内主 I. Preface Xihe Group (Diaoyutai Formation, Nanfen Formation and Qiaotou Formation) and Hunjiang Group (Bandung Formation, Baodujiang Formation and Qingougou Formation) have the sequence connecting the north Qingbai Estuary and the southern Sinian. The Qingbaikou system, the Sinian system is the world in the late Cambrian Department of the establishment of a stratigraphic unit category. To clarify the position of the fine river group, the Hunjiang group, the age, and the position in Qingbaikou and Sinian, the connection to the late Precambrian stratigraphy in South and North China, The use of the word Sinian has a very important practical significance. Fine river group, Hunjiang group division, top and bottom boundary and contrast programs in the province there are still different opinions: the main