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(一) 近几年来,加拿大纽芬兰西部寒武系-奥陶系界线剖面经过不少人的调查研究,可能作为国际寒武系-奥陶系界线层型的呼声很高。目前看来,只有中国吉林浑江大阳岔的寒武系-奥陶系界线剖面可以与之抗衡。 1986年7月下旬在吉林省浑江市召开了寒武系-奥陶系界线国际会议,各国代表对浑江大阳岔的小阳桥等几个寒武系-奥陶系剖面进行了仔细的观察和认真的讨论。几个剖面中以小阳桥剖面最为杰出,不仅地层出露良好,而且化石多,保存佳,尤其是笔石丰富多彩。深为国际同行所称道。冶里组底部一层新笔石的发现,更引入注目。林尧坤
(I) In recent years, the Cambrian-Ordovician boundary line profile in western Newfoundland of Canada after many people’s investigations and studies may serve as a high voice for the international Cambrian-Ordovician boundary line. At present, only the Cambrian-Ordovician boundary profile of Dayangcha, Hunjiang, China, can compete with it. In late July 1986, an international conference of the Cambrian-Ordovician boundary line was held in Hunjiang City, Jilin Province. Delegates from various countries made a careful observation of several Cambrian-Ordovician sections such as Xiaoyang Bridge at Dayangcha of the Hunjiang River And serious discussion. In several sections, the Xiaoyang Bridge profile is the most outstanding. Not only is the stratum exposed well, but also many fossils are preserved, especially the pen and stone are colorful and colorful. Deep international counterparts praised. Yeli group at the bottom of a new layer of penoliths found, even more attention. Lin Yao-kun