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第一节研究简史云南东部位于东径102°—105°,北纬23°20′—28°40′之间,即金沙江以南,华坪—元谋—罗茨—峨山—红河一线以东,南抵红河—开远—富源一线,东临滇黔两省交界,属扬子地层区西南部(图3—1)。区内震旦系、寒武系发育良好,两系地层连续过渡,为单一的海相沉积,出露广泛, 生物化石异常丰富,交通亦很方便,为研究震旦系—寒武系界线提供了极有利的条件,是国内外研究前寒武系--寒武系界线理想的地区之一。
The first section of a brief history of research in eastern Yunnan is located in the east path of 102 ° -105 ° north latitude 23 ° 20’-28 ° 40 ’between the south of Jinsha River, Huaping - Yuanmou - Roots - Esan - Honghe first line, South arrived Honghe - Kaiyuan - Fuyuan line, east of Yunnan and Guizhou provinces at the junction of the Yangtze River strata in the southwest (Figure 3-1). The Sinian and Cambrian systems in the area are well developed. The two series of strata are continuously transited to form a single marine sediment with a wide range of exposures. The fossils are exceptionally rich and the traffic is also very convenient. In order to study the Sinian-Cambrian boundary Very favorable conditions, is one of the ideal research areas at home and abroad Precambrian - Cambrian boundary.