湖北秭归地区晚寒武世末期至早奥陶世早期总体上表现为一个大的海侵沉积序列。本文通过详细的露头层序地层学研究及１∶５万区域地质填图，将该区娄山关组顶部至红花园组划分为２个三级层序，总结了各层序的层序界面性质及体系域发育特征，并建立了区域地层格架，从而进一步指出：块状白云岩的形成和分布明显受海平面下降事件的控制。 Early in the Late Cambrian to Early Ordovician in the Zigui area of ​​Hubei Province generally showed a large sequence of transgressive sediments. In this paper, through detailed outcrop sequence stratigraphy and 1: 50000 regional geological mapping, the top of the Loushanguan Formation to Honghuayuan Formation is divided into two third-order sequences, and the sequence boundaries of each sequence are summarized Nature and phylogenetic tract, and established the regional stratigraphic framework. It further points out that the formation and distribution of massive dolomite are obviously controlled by the sea level descending event.