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川滇地区系指云南东部、东北部,四川西部及西南部的广大地区。南起云南华宁,北至四川峨眉,长600公里,宽40—60公里,沿康滇古陆东缘分布的一个狭长条带。该区震旦纪、寒武纪地层发育完整、岩性单一、厚度大、化石丰富,是我国研究和解决震旦系—寒武系界线的重要地区之一(图1)。在云南东部前人对有关本问题曾进行过一定探讨,前文已有论述。 四川西部、赵亚曾(1929)、谭锡畴、李春昱(1933)等在区域地质调查和近年钱义元、
Sichuan-Yunnan region refers to the eastern part of Yunnan, northeast, western Sichuan and southwestern regions. South from Yunnan Huaning, Emei Sichuan to the north, 600 km long, 40-60 km wide, along the eastern edge of Hong Kang ancient Yunnan distribution of a long strip. The Sinian and Cambrian strata in this area are well-developed, with a single lithology, large thickness and rich fossils. It is one of the most important areas in China to study and solve the Sinian-Cambrian boundary (Figure 1). The predecessors in eastern Yunnan have conducted some discussions on this issue, as discussed above. In western Sichuan, Zhao Yazeng (1929), Tan Xincu, Li Chunyu (1933) and other geological survey in the region and in recent years Qian Yiyuan,