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首页> 外文期刊>Alcheringa: An Australasian Journal of Palaeontology >Biodiversification of Early to Middle Ordovician conodonts: a case study from the Zitai Formation of Anhui Province, eastern China
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Biodiversification of Early to Middle Ordovician conodonts: a case study from the Zitai Formation of Anhui Province, eastern China

机译：奥陶纪早期到中期的牙形石生物多样性：以安徽省子台组为例

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摘要

The Lower-Middle Ordovician Zitai Formation of the South China palaeoplate consists of a succession of purple red, nodular argillaceous limestones. Palaeogeographically, it is distributed along the southeastern margin of the Yangtze Platform, and is of late Floian to Dapingian age, correlative with the Dawan Formation of the Middle and Lower Yangtze Platform. In Shitai County, Anhui Province, East China, the Zitai Formation is rich in conodonts, enabling the recognition of four biozones based on first appearance data. Detailed palaeontological and biostratigraphical study of these conodonts reveals that the Ordovician conodont radiation in the Lower Yangtze Platform attained its first diversity peak low in the Oepikodus evae Biozone. This diversification is generally consistent with macroevolutionary trends of brachiopods of South China and graptolites of the Upper Yangtze Platform, but was earlier than that of trilobites and acritarchs of the same palaeoplate. Correlation with the sea-level curve for South China suggests that conodont diversity change during the Ordovician radiation was mainly controlled by regional sea-level fluctuations.
机译：华南古板块的下中奥陶统子台组由一系列紫色红色的球状泥质灰岩组成。古地理上，它分布在扬子台地东南缘，是花开晚期至大坪时期，与扬子中下台地大湾组有关。在中国东部安徽省石台县，子台组富含牙形石，可以根据首次出现的数据识别出四个生物区。对这些牙形石的详细古生物学和生物地层学研究表明，下扬子台地的奥陶纪牙形石辐射在Oepikodus evae Biozone中达到了其首个多样性峰低点。这种多样化总体上与华南腕足类和上扬子平台的鹅膏石的宏观演化趋势相一致，但早于同一古板块的三叶虫和顶角类动物。与华南海平面曲线的相关性表明，奥陶纪辐射期间牙形石多样性的变化主要受区域海平面波动的控制。

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    Rongchang Wu;

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    LPS, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, VIC, 210008, China;

    Geological Survey of New South Wales, Industry & Investment NSW, W.B. Clarke Geoscience Centre, 947–953 Londonderry Road, Londonderry, NSW, 2;

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