【摘要】 湖北宜昌兴山古洞口剖面分乡组鉴定出19属,33种疑源类化石。分乡组上部样品中疑源类化石大量产出,其中Polygonium、Rhopaliophora、Stelliferidium占绝对数量优势。通过对比优势属丰度与相对海平面变化,发现Rhopaliophora对海水深度变化反应敏感,是良好的深水环境指示分子;Stelliferidium的相对丰度存在随海水深度增加而增长的趋势,但变化不甚明显;Polygonium相对丰度的增减与相对海平面变化没有明显相关性。更多还原

【Abstract】 33 acritarch species attributed to 19 genera are identified from the Fenhsiang Formation of Gudongkou section, Xingshan, Yichang, Hubei Province, China. Samples from the upper part of the Fenhsiang Formation yield massive acritarch fossils which is dominated by Polygonium, Rhopaliophora and Stelliferidium. Comparing the rela-tive changes in abundance of dominant genera with the relative sea level changes, we find that Rhopaliophora is sensitive to changes of water depth, which is likely to be a credible deep-water marine condition indicator, Stelliferidium has a tendency to increase in abundance with the raise of sea level, but the fluctuation is not so obvious, and there is no clear correlation between the Polygonium relative abundance and sea level change.更多还原