一、前言宝塔组自1924年李四光创建以来,一直是我国奥陶纪地层古生物工作者研究的主要对象之一。但是由于过去对其所产的三叶虫、牙形石研究较少,划分与对比甚感困难。为了探索比较合理的解决方案,笔者于1980、1982年先后在浙江、贵州、四川、湖北、陕西等地实地观察了该组地层的岩相特征,详细测制了地层剖面,采集了三叶虫、头足类化石以及牙形石样品,结合分析已发表的研究成果,对其时代归属提出一点初浅的看法。 I. Preface Since the creation of Li Siguang in 1924, the pagoda group has been one of the main targets of paleontologists in the Ordovician strata in China. However, because of the trilobites and conodonts they produced in the past, there are few studies on the conodont and the classification and comparison are very difficult. In order to explore a more reasonable solution, the author observed the lithofacies characteristics of the formation in Zhejiang, Guizhou, Sichuan, Hubei and Shaanxi provinces in 1980 and 1982, measured the stratigraphic profile in detail and collected Trilobite , Cephalopods and conodont samples, combined with the published research results, put forward some views on the ownership of the era.