中国上石炭统上部及下二叠统海相地层中阶的划分

明确而详细地提出了中国上石炭统上部及下二叠统海相年代地层单位的具体框架。将上石炭统上部划分为消遥阶、下场家河阶；下二叠统划分为上杨家河阶、范家河阶、垭口阶及隆林阶。明确了阶的定义、动物群特征、磁性地层特征及其与相关地层的关系。所划分的阶均能与世界标准年代地层进行详细而有依据的对比。

Stages of upper Upper Carboniferous and Lower Permian marine strata in China

In1992,according to the fossil assem blage zones,magnetic approach and oxygen-carbon isotope studies Ding divided the Upper Carboniferous to Lower Permian strata into five stages.In this paper,on the basis of Ding's division with some modification,the authors divide the upper Upper Carboniferous into the Xiaoyaoan Stage and Lower Yangjjia hean Stage and the Lower Permi an into the Upper Yangjiahean Stage,Fanjiahean Stage,Yakouan Stage and Longlinian Stage.The first five stages were established by Ding et al.in1992,while the last stage was reported by Huang et al.in1982.The authors give a clear and definite definition of the stages,characterize the fau nas and magnetostratigraphy and clarify their rela-tions to the related strata.The stages thus distin guished can all be correlated with the standard chronos-tratigraphic units of the world in details and on well-established grounds.