江西乐平地区晚二叠世—早三叠世的牙形石动物群

Conodont Fauna of Late Permian to Early Triassic inLeping Area,Jiangxi Province

讨论了赣中乐平地区沿沟剖面上二叠统至下三叠统地层的牙形石动物群 ,列出了牙形石的各个形态属种在地层中的分布及其数量变化。根据特征牙形石分子的地层分布 ,将该段地层自下而上划分为 3个牙形石带 ,分别是 :Clarkinachangxingensis Cl.deflecta Cl.subcarinata组合带 ;Hind eoduslatidentatus带和Hindeodusparvus带。鉴于在晚二叠世至早三叠世 ,Hindeodus属种的牙形石分子的Pa分子成为界定种之间的主要标志特征 ,本文描述了两个重要牙形石种即Hindeoduslatidenta tus和Hindeodusparvus的Pa分子 ,并探讨了二者之间所具有的演化关系 ;此外 。

The Conodont Fauna of late Permian to early Triassic from Yangou section in Leping area,Jiangxi Province was discussed in this paper.All of the Conodont individuals founded in this section were listed in a figure.According to the distribution of the important conodont elements,this section was divided into three conodont zones from the upper permian to the lower Triassic:Clarkina.changxingensis,Cl.deflecta and Cl.subcarinata Assemblage Zone;Hindeodus latidentatus Zone and Hindeodus parvus Zone.According to the significant meaning of Hindeodus's Pa elements,this article described two important Pa elements of Hindeodus,namely H.latidentatus and H.parvus,discussed evolutionary relation between them;The perfectly preserved Pa elements of this two conodont species are of great research value.