群层 meaning in English
sheaf of groups
sheave of groups
Examples
- A new division and correlation plan is proposed on the basis of a clear division regulation of stratigraphic sequence , after a detailed study on the strata in the areas
本文通过对辽南及苏皖北部地方的晚前寒武纪地层层序和鲁东蓬莱群与鲁西土门群层位问题进行深入剖析，在厘清地层层序的基础上提出新的划分与对比方案。