Conodont Biostratigraphy of the Middle Cambrian through Lowermost Ordovician in Hunan, South China
Conodont Biostratigraphy of the Middle Cambrian through Lowermost Ordovician in Hunan, South China
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DOI：
10.1111/j.1755-6724.2004.tb00776.x
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发表时间：
2004-12
期刊：
影响因子：
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通讯作者：
Xiping Dong;J. Repetski;S. M. Bergström
中科院分区：
文献类型：
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作者：
Xiping Dong;J. Repetski;S. M. Bergström
自1985年以来，对湖南湘西和湘西北三个重点剖面的牙形石进行了处理，总重量超过14,000公斤。在晚寒武世晚期以前的地层中，副牙形刺被证明是地层划分和对比的有用材料。在中寒武统至最下奥陶统共划分出13个牙形石带。这些带与华北、美国西部和中国东部的带具有很好的对应关系。美国，纽芬兰西部，加拿大和伊朗进行了讨论。这13个带按升序排列如下：Gapparodus bisulcatus-Westergaardodina brevidens带、Shandongodus priscus-Hunanognathus tricuspidatus带、Westergaardodina quadrata带、Westergaardina matsushitai-W。grandidens Zone，Westergaardodina lui-W. ani Zone，Westergaardodina cf. calix‐Prooneotodus rotundatus带、Proconodontus tenuiserratus带、Proconodontus带、Eoconodontus带、Cordylodus proavus带、Cordylodus intermedius带、Cordylodus lindstromi带、Cordylodus angulatus带（下部）。韦斯特加多迪纳·卢瓦ani和Westergaardodina cf. calix-Prooneotodus rotundatus区取代Westergaardodina proligula和Westergaardodina cf. behen-Prooneotodus rotundatus带，分别在最低的上寒武统。2个新种（Westergaardodina lui和Westergaardina ani）和1个条件鉴定种（Westergaardodina cf.杯）。
Abstract Since 1985, samples with a total weight of more than 14,000 kg, mainly from three key sections in western and northwestern Hunan, South China, have been processed for conodonts. In strata older than the late Late Cambrian paraconodonts have proved useful for stratigraphic subdivision and correlation. Thirteen conodont zones are proposed in the Middle Cambrian through lowermost Ordovician. The correlation between these zones and those of North China, western U. S.A., western Newfoundland, Canada, and Iran is discussed. In ascending order, these 13 zones are as follows: The Gapparodus bisulcatus‐Westergaardodina brevidens Zone, Shandongodus priscus‐Hunanognathus tricuspidatus Zone, Westergaardodina quadrata Zone, Westergaardodina matsushitai‐W. grandidens Zone, Westergaardodina lui‐W. ani Zone, Westergaardodina cf. calix‐Prooneotodus rotundatus Zone, Proconodontus tenuiserratus Zone, Proconodontus Zone, Eoconodontus Zone, Cordylodus proavus Zone, Cordylodus intermedius Zone, Cordylodus lindstromi Zone, and Cordylodus angulatus Zone (lower part). The Westergaardodina lui‐W. ani and Westergaardodina cf. calix‐Prooneotodus rotundatus Zones replace the Westergaardodina proligula and Westergaardodina cf. behrae‐Prooneotodus rotundatus Zones, respectively, in the lowermost Upper Cambrian. Two new species (Westergaardodina lui and Westergaardodina ani) and one conditionally identified species (Westergaardodina cf. calix) are described.