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运用沉积学和层序地层学研究方法，结合生物地层学，在古地理格局演化和海平面变化分析的基础上，对华北地区下古生界进行沉积相划分和层序地层研究，将下古生界划分为两个超层序和１２个三级层序．各层序主要或基本由海侵体系域及高水位体系域组成．两个超层序最底部的层序为Ⅰ型层序，其顶底界面为Ⅰ类层序界面（ＳＢ１），其余的层序均为Ⅱ型层序，其顶底界面为Ⅱ类层序界面（ＳＢ２）边界
Based on the study of sedimentology and sequence stratigraphy, combined with bio-stratigraphy, the evolution of paleogeography and the analysis of sea-level changes, the sedimentary facies division and sequence stratigraphy of the Lower Paleozoic in North China are studied. The world of life is divided into two super-sequences and 12 third-level sequences. The sequences are mainly or basically composed of transgressive system tract and highstand system tract. The bottom sequence of the two super-sequence sequences is a type-Ⅰ sequence with the top-bottom interface as a type-Ⅰ sequence interface (SB1) and the rest of the sequences as Type-Ⅱ sequences with top- Interface (SB2) boundary