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第一节研究简史四川西南部峨嵋—汉源以南,金沙江以北广大地带位于扬子地层区西部北段,是我国震旦系和寒武系发育较好,分布广泛的地区之一。区内震旦系与寒武系为连续沉积,边界层位露头良好,化石丰富,可供研究的剖面很多。其中峨嵋麦地坪剖面已成为国际前寒武系—寒武系界线层型工作的参考点(图4—1)。因此川西南区已成为我国研究震旦系—寒武系界线极其重要的地区之一。
Section 1 Brief History of Research Brief History of the Emei-Hanyuan Region in the southwest of Sichuan Province and the vast area north of the Jinsha River in the northern part of the western part of the Yangtze stratigraphic area are one of the regions where Sinian and Cambrian developed well in our country. The Sinian and Cambrian sediments in the area are continuously deposited with well-defined boundary layers and abundant fossils. There are many sections available for research. Among them, the Emei maidiping section has become a reference point for the international Precambrian-Cambrian boundary line work (Figure 4-1). Therefore, Southwest Sichuan has become one of the most important areas in China for the study of the Sinian-Cambrian boundary.