为了评价华北地区含油、气远景,研究寒武系和奥陶系的岩性分区,讨论其古地理变迁,是重要内容之一。本文把寒武系分为猴家山阶、馒头阶—徐庄阶、张夏阶及上寒武统四个层组,奥陶系分为下奥陶统、下马家沟阶、上马家沟阶和峰峰阶四个层组进行讨论。地层系统及主要化石带如表1。 In order to evaluate the oil and gas potentials in North China and to study the lithological zoning of the Cambrian and Ordovician and to discuss the paleogeographic changes, it is one of the important contents. In this paper, the Cambrian strata are divided into four phases, namely, the Houjiajian, Mianzhuang, Xuzhuang, Zhangxia and Upper Cambrian strata. The Ordovician is divided into the Lower Ordovician, the Lower Jiajiagou, the Upper Jiajiagou, Four layers to discuss. Stratigraphic systems and major fossil zones are shown in Table 1.