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辽宁省寒武系、奥陶系主要分布于复州-大连、太子河及辽西三个小区，三者地层系统一致，岩相、岩性雷同，同处于“华北型”沉积环境，可进行层序对比。其中辽西小区共发育 8个层序，复州-大连小区发育 16个层序，太子河流域划分 15个层序，除层位缺失因素，三者层序划分基本相同，层序界面一致，其中Ⅱ级界面可以追索。通过对比，发现层序的发育与环境演化关系密切。总体而言，在环境开阔，水体能量较高区域，层序之海侵体系域较发育，而高水位体系域相对较少，而在环境相对闭塞、水体循环不畅的条件下，层序组成主要以高水位体系域为主，同时，在深水陆棚碳酸盐岩沉积中，往往发育淹没不整合事件，层序结构为 SB3＋ CS＋ HST。
The Cambrian and Ordovician of Liaoning Province are mainly distributed in the three communities of Fuzhou, Dalian, Taizi River and Liaoxi. The stratigraphic systems of the three are the same, the lithofacies and lithology are the same, and they are located in the “North China type” sedimentary environment. Sequence comparison. Among them, there are altogether 8 sequences in Liaoxi district, 16 sequences in Fuzhou-Dalian district and 15 sequences in Taizi river basin. Except for the lack of horizon, the three sequences are basically the same and the sequence interfaces are the same, among which Ⅱ-level interface can be recourse. By comparison, it is found that the development of the sequence is closely related to the evolution of the environment. In general, in the open environment and higher water energy areas, the transgressive system tract of the sequence is relatively developed, while the relatively high level system tract is relatively small. Under relatively closed environment and poor water circulation, the sequence composition Mainly in the high water system tract, and at the same time, in the deep-shelf carbonate sediments, submergence unconformities often develop. The sequence structure is SB3 + CS + HST.