叠层石的各种形态类型究竟是主要受生物因素的控制,还是环境影响所致,这是长期以来一直争论的问题。为试图解决前震旦系昆阳群(云南)和会理群(四川)的划分和对比,笔者于1975—1980年期间曾对产于昆阳群大龙口组、美党组、落雪组和青龙山(或绿汁江)组,会理群凤山营组中的叠层石进行了形态学的初步研究。结果发现在同一地层中叠层石的形态乃至其内部微构造沿走向变化很大,因而在地层划分对比上的应用就有局 It is a longstanding controversy over whether the various forms of monoliths are mainly controlled by biological factors or by environmental influences. In order to try to solve the division and comparison of the former Sinian Kunyang Group (Yunnan Province) and Huili Group (Sichuan Province), from 1975 to 1980, (Or green juice River) group, Huili Group Fengshan camp in the strata for a preliminary study of morphology. The results show that in the same strata, the shape of the stratigraphic rocks and their internal micro-structures vary greatly along the strike, so the application of stratum division contrast