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ACRITARCH ASSEMBLAGES FROM THE EARLY - MIDDLE CAMBRIAN KAILI FORMATION OF EAST GUIZHOU PROVINCE AND BIOSTRATIGRAPHIC IMPLICATION
Author(s): 
Pages: 55-69
Year: Issue:  1
Journal: ACTA MICROPALAEONTOLOGICA SINICA

Keyword:  疑源类组合中、下寒武统界线凯里组贵州;
Abstract: 通过对台江八郎和丹寨平寨两条剖面凯里组中疑源类化石的分析、研究,台江剖面产疑源类化石有17属35种(12未定种),其中以Leiosphaeridia,Synsphaeridium,Cymatiosphaera,Pterospermella最为丰富;可划分为3个组合,即Cymatiosphaeracf.cristata-Fimbriaglomerellamembrancea组合,Cristallinium-Micrhystridium-Pterospermella组合和Dictyotidium-Granomarginata组合。丹寨平寨剖面凯里组所产疑源类化石有:13属21种(5未定种),同样划分为3个组合,即Leiosphaeridia-Tasmanites组合,Retisphaeridium-Micrhystridium tentatium组合和Baltisphaeridium-Bubomorpha hunjiangensis组合。本文对两条剖面中的疑源类化石的组成、相对含量做了详细的统计,发现在八郎剖面9-2层和平寨剖面3层疑源类的丰度、分异度开始发生明显的变化,表现由早寒武世向中寒武世疑源类组合面貌的转变,这一疑源类转变层位正好是与三叶虫划分的中、下寒武统界线的层位位置相一致。这充分表明疑源类化石可作为划分中、下寒武统的极有价值的微体生物化石证据。
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