【摘要】 桐梓红花园剖面奥陶纪地层出露完整,化石丰富,层序清楚。该剖面湄潭组5个笔石带中有疑源类化石31属49种,根据其组成和相对丰度不同划分为5个疑源类组合带:组合带的属、种较为单调,且丰度不高;组合带中Polygonium占优势,伴有Arbusculidium;组合带以大量Stelliferidium的出现为特征;组合带与组合带相似;组合带中Leiosphaeridia的含量比Polygonium高,产特征分子Coryphidiumelegans。桐梓红花园湄潭组疑源类组合与中欧、北非、中东、南亚、北美纽芬兰东部、南美等环冈瓦纳地区同期疑源类组合相似,证实华南地区属于环冈瓦纳疑源类古地理分区。部分奥陶纪疑源类分子,如Ampullulaerchunensis、Arkonia、Dicrodiacrodium和Leprotolypaevexa等在桐梓红花园剖面的首现(FAD)较全球其他地区早。更多还原

【Abstract】 The Ordovician strata exposed at the Honghuayuan section in Tongzi, Guizhou, southwestern China, contain abundant fossils. Forty-nine acritarch species assigned to 39 genera are recorded from five graptolite biozones within the Meitan Formation. Five palynologic assemblage zones have been recognized from the Meitan Formation of the Honghuayuan section. Both taxonomic diversity and abundance is poor in Assemblage Zone I. Assemblage Zone Ⅱ is characterized by the appearance of Arbusculidium filamentosum and is dominated by representatives of Polygonium. Assemblage Zone Ⅲ is dominated by Stelliferidium. Assemblage Zone Ⅳ is similar in composition to Assemblage Zone Ⅱ. The Assemblage Zone Ⅴ is characterized by the appearance of Coryphidium elegans, in which the relative abundance of Leiosphaeridia is higher than that of Polygonium. The FADs of Ampullula erchunensis, Arkonia, Dicrodiacrodium and Leprotolypa evexa in the Meitan Formation are earlier than in other places.更多还原