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分析了湖北宜昌杨家湾志留系罗惹坪组—纱帽组一段剖面的72件样品,在其中36件泥岩、粉砂岩样品中发现大量保存完整的早志留世几丁虫化石。自下而上识别出Conochitina rossica和Conochitina malleus生物带;分析了每一个几丁虫生物带的组合特征和时代意义,并与拉脱维亚、爱沙尼亚同期的几丁虫以及宜昌地区同期笔石和牙形石进行了对比,指出宜昌地区罗惹坪组的时代大致与笔石Stimulogratussedgwickii带相当,属于埃隆期晚期。
A total of 72 samples from a section of Silurian Formation-Silurian Formation of the Silurian Silurian in Yangjiawan, Yichang, Hubei Province were analyzed. A large number of preserved early Siluriforra chinensis fossils were found in 36 mudstone and siltstone samples. Conochitina rossica and Conochitina malleus belts were identified from the bottom up; the combined features and epoch significance of each bellez band were analyzed and compared with the penicillin in Latvia and Estonia over the same period and penicilli and conodont in Yichang area In contrast, it is pointed out that the age of the Luojingping Formation in Yichang is roughly equivalent to the Stimulogratussedgwickii belt and belongs to the late Elon period.