康滇地轴中段的双水井组、天宝山组以及九盘营组,是一套含富铁矿的火山岩系地层,在空间上分别位于西昌以南的会理、会东、德昌,北至沪沽、汉源、甘洛一带。前人把它们分别划为前震旦系中部,上部或顶部层位。我们研究后,认为这些地层都是同一时代,同一层位,属于下震旦系、层位相当于苏雄组。文中引用大量实际资料,从七个方面论证了双水井组,天宝山组及苏雄组层位相同岩性岩相相似。第一,在岩性上都是一套陆相或海陆交互相火山冰碛岩系。提出了苏雄组底部及 The Shuangshuijing Formation, the Tianbaoshan Formation and the Jiupengying Formation in the central axis of the Kangdi-Dianxi axis are a set of volcanic rock strata containing iron-rich ore. They are located in Huili, Huidong, Dechang, Shanghai and Shanghai, Hanyuan, Ganluo area. They were divided into the former Sinian, respectively, the central, upper or top layer. After our research, we believe that these strata are all of the same age and the same layer belonging to the Lower Sinian, and the strata are equivalent to the Suxu Formation. In this paper, a large number of actual data are quoted and the similar lithofacies of the Shuangshuijing Formation, the Tianbaoshan Formation and the Suxu Formation are similar in terms of seven aspects. First, lithology is a continental facies or sea-land interaction volcanic moraine rock series. Presented Suxiong group bottom and