由中国科学院主持的寒武——奥陶系、奥陶——志留系界线国际学术讨论会于1983年10月26至29日在我国南京召开。来自奥大利亚、英国、加拿大、中国、丹麦、法国、联邦德国、爱尔兰、日本、新西兰、挪威、美国等十二个国家的一百多位地层古生物学家参加了会议。开幕式上,中国科学院学部委员、科学院地学部常委叶连俊教授致开幕词。他说,我国各时期的地层发育良好,地层剖面连续、化石相当丰富、门类比较齐全、也有相当的研究基 The Cambrian-Ordovician and Ordovician-Silurian boundary international symposium chaired by the Chinese Academy of Sciences was held in Nanjing, China from October 26 to October 29, 1983. More than 100 protozoan biologists from 12 countries including Austria, the United Kingdom, Canada, China, Denmark, France, the Federal Republic of Germany, Ireland, Japan, New Zealand, Norway and the United States attended the conference. At the opening ceremony, Prof. Ye Lianjun, member of the Academia Sinica and member of the Academia Sinica, made an opening statement. He said that the stratums of various periods in our country have developed well, the stratigraphic sections are continuous, the fossils are quite rich, the categories are quite complete, and there are quite a few research bases