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在对湖南大庸、新晃、沅陵、溆浦和黔阳等地上震旦统—早寒武世初期露头层序地层学的研究表明，湘西地区上震旦统内部存在３个与视海平面变化相对应的超层序，其上限大致可以留茶坡组顶部区域性成磷事件的出现为标志。黑色岩系的形成是海平面上升的结果，尽管该岩系具有色深、层薄和富含有机质的共同特点，但不同层位黑色岩系的岩石化学成分和微量元素组成不同，因此具有不同的沉积环境和形成机制。经研究，晚震旦世金家洞组第二段和寒武纪初期黑色岩系的形成与海底火山和深大断裂的热泉喷流作用有关；而金家洞组第四段和留茶坡组下部黑色岩系的形成则与盆地断陷、地壳拉张减薄并造成地幔流体上涌和地球排气作用有关；留茶坡组中上部黑色岩系则是深水盆地的热水沉积产物
In the study of the Upper Sinian - Early Cambrian outcrop sequence stratigraphy in the areas of Dayong, Sinko, Yuanling, Xupu and QianYang in Hunan Province, it is found that there are 3 strata in the Upper Sinian in western Hunan, Changes in the corresponding super-sequence, the upper limit of the tea can leave the top of the formation of the regional phosphorus event as a sign. The formation of black rock series is the result of sea level rise. Although the rock series has the common characteristics of color depth, thin layer and rich organic matter, the lithology and trace element composition of black rock series in different layers are different, Sedimentary environment and formation mechanism. After the study, the formation of the second member of the Late Jinzidong Formation and the formation of black Cambrian during the Cambrian period was related to the hot spring-jet effect of the submarine volcano and the deep fault. The fourth member of the Jinjiadong Formation and the remaining tea The formation of the black rock series in the lower part of the slope group is related to the basin faulted depression, the thinning of the crust and the upwelling of the mantle fluid and the earth’s exhaust; the middle-upper black rock series of the Liushupo Formation are the hot-water sedimentary products of the deep-water basin