约代尔旋回沉积与腕足动物群落的演替

根据内蒙古准格尔旗晚石炭世含煤地层的约代尔旋回层序，分析了腕足动物群落的演替和顶极群落的识别标志，指出约代尔旋回和顶极阶段，衰退阶段都是良好的时间标志，根据群落演替的各个阶段，可以较精确地划分和对比地层，其精度优于化石组合带方法。

YOREDALE CYCLIC DEPOSITION AND COMMUNITY SUCCESSION OF BRACHIOPODS

Based on the Yoredale cyclic sequences of Upper Carboniferous coal bearing strata of Zhungerqi,Inner Mongolia,the identifiable criteria of the brachiopod community succession and climax community are discussed in this paper.It is pointed out that the Yoredale cycle and climax or decline stages are all ideal time markers.In the light of stages of community succession,the stratigraphic division and correlation could be more effective and precise than using fossil assemblage zones.