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四川峨眉高桥震旦系—寒武系界线剖面构造简单,沉积连续,化石丰富,是我国研究震旦系与寒武系界线重要剖面之一。本文系统地介绍了峨眉山地区震旦系—寒武系的研究历史,剖面详细分层及岩性和生物特征。论述了本区晚震旦世至早寒武世初期沉积环境的变迁、生物演化及震旦系—寒武系界线划分。本文以首次多门类带壳动物的大量出现作为划分震旦系与寒武系界线的主要依据。寒武系的下界划分在麦地坪组下部以小壳动物Anabarites—Circotheca为代表的化石组合的底界上,并与国内外相当时代的地层及界线进行了对比。
Sichuan Emei Takahashi Sinian - Cambrian boundary profile is simple structure, continuous deposition, rich fossils, is China’s Sinian and Cambrian study of critical sections. This paper systematically introduces the research history, section stratigraphy and lithology and biological characteristics of Sinian-Cambrian in Emeishan area. Discusses the changes of sedimentary environment, biological evolution and Sinian-Cambrian boundary division from the late Sinian to early Cambrian in this area. In this paper, the first large number of shelled animals with large numbers of occurrences as the main basis for the division of Sinian and Cambrian boundaries. The lower Cambrian boundary is divided into the lower boundary of the fossil assemblage represented by the small shell animal Anabarites-Circotheca at the lower part of the Makadi Ping Formation and compared with the stratigraphic and boundary lines at home and abroad of the corresponding era.