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建立前寒武纪统一地层表是一项非常急迫的任务,只有当同位素年令测定方法出现以后,结合生物地层法才开始对前寒武纪地层进行划分对比,对不同构造岩相带的地层剖面进行全球性的对比。不久前,K.兰卡玛提出的建立全球性的统一地层表的方案是一项非常重要的倡议。到目前为止,建立前寒武纪统一地层表大致提出了三种方法:①标准剖面法:划分地层及其相应的地质年代时,应有一个标准层型剖面作为对比的依据,这一标准的层
The establishment of the Precambrian unified stratigraphic table is a very urgent task. Only when the isotope dating method appears, the stratigraphy of the Precambrian stratigraphy is started to be compared with the biostratigraphic method, and strata of different tectonic lithofacies Profile of a global comparison. Not long ago, the proposal by K. Langkama to establish a global table of unified stratigraphy was a very important initiative. Up to now, there have been three methods proposed for the establishment of a unified Precambrian stratigraphic table: ① Standard profiling method: When stratigraphic stratigraphy and its corresponding geologic age are divided, there should be a standard stratified profile as the basis for comparison. Floor