【摘要】 <正> 一、前言 四川峨眉高桥震旦系—寒武系界线剖面位于峨眉山东麓。其大地构造位置居川滇南北向构造带东侧,扬子台背斜西部边缘地带。这里震旦纪和寒武纪地层广泛发育,构造简单,沉积连续,化石丰富,交通方便,是研究震且系与寒武系界线比较理想的地区之一。更多还原

【Abstract】 The boundary section between Sinian and Cambrian at Gaoqiao in Emeicounty of Sichuan Province is one of the important section in studying thementioned boundary in China because of its simplicity of structure, the conti-nuity of stratigraphic sequence and the abundance of fossils. This paper introduces systematically the research history of the Sinianand Cambrian, the subdivision of strata and organisms concerned in the areanear Mt. Emei. It also describes the sedimentary environments, the evo-lution of organisms from the late Sinian to the begining of early Camb-rian. The authors consider the first appearance of enormous amount of vari-ous kinds of shell fossils as the principal basis for the division of Sinian andCambrian.The small-sized shelly fossils-Anarbarites-Circotheca,which repre-sent the fossil assemblage in the lower part of the Maidiping Formation,attest to the presence of the lowest part of Cambrian, These can be correlatedwith contemporaneous strata and boundaries in different districts of China aswell as in different parts of the world.更多还原