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本文报道湖南益阳南坝剖面早奥陶世弗洛期笔石16属30种,描述其中具有重要地层意义的笔石10属16种:Acrograptus affinis,A.gracilis,Baltograptus geometricus,B.vacillans,Clonograptus rigidus,Corym-bograptus deflexus,Cymatograptus undulatus,Didymograptellus bifidus,“Didymograptus”demissus,“D.”rigo-letto,Expansograptus hol mi,E.constrictus,Pendeograptus fruticosus,P.pendens,Tetragraptus akzharensis,T.approxi matus。南坝剖面弗洛期笔石动物群以均分笔石为主,同时含有少量反称笔石。该地区弗洛期笔石动物群的分异度、丰度均较高,展示了笔石演化辐射早期斜坡相沉积环境下的笔石动物群特征。本文研究为全面理解奥陶纪笔石的演化辐射积累了重要资料。
This paper reports 30 species of 16 genera of Early Ordovician Holocene in Nanba, Yiyang, Hunan Province, and describes 16 genera of 10 genera: Acrograptus affinis, A.gracilis, Baltograptus geometricus, B.vacillans and Clonograptus rigidus, Corym-bograptus deflexus, Cymatograptus undulatus, Didymograptellus bifidus, “Didymograptus” demissus, “D. ” rigo-letto, Expansograptus holmi, E.constrictus, Pendeograptus fruticosus, P. pendens, Tetragraptus akzharensis, approxi matus The Nanlou section of the Florello penicilli fauna is dominated by penicillin, with a small amount of anti-penicillin. The differentiation and abundance of the Florello penicid fauna in the area are high, showing the characteristics of the penolith fauna in the early ramp facies sedimentary environment. The research in this paper has accumulated important data for the comprehensive understanding of the evolutionary radiation of Ordovician penoliths.