滇东,黔西和桂北不同相区的三叠纪牙形刺

本文描述了采自滇东、黔西和桂北不同相区２８个剖面的三叠纪牙形刺共２２属７９种。由于不同相区的牙形刺动物群具有不同的特征，因此不同性质的牙形刺动物群的分布与岩相和古沉积环境关系非常密切。本区三叠纪牙形刺可明显分为两大类型，即“台地型”和“盆地型”。本文论述了牙形刺动物群的分布与岩相相带之关系，组建了不同相区的牙形刺序列，同时讨论了二叠－三叠系界线。

TRIASSIC CONODONTS FROM DIFFERENT FACIES IN EASTERN YUNNAN, WESTERN GUIZHOU AND NORTHERN GUANGXI

The conodonts described here were collected from 28 sectionsin eastern Yunnan,western Guizhou and northern Guangxi which represent different facies as shown in Figs.1-4,with 22 genera and 79 species, including 4 new species.Those collected from different facies are different in characters.The distribution of conodonts mostly depends on the sedimentary environment and facies.In this region two major types of conodont zonation have been recognized:the "platform facies type" occurring mostly in the shoal area of platform, and the "basinal facies type" occurring in the open shelf,the slope and basin facies,with a total of 12"platform facies type" and 15 "basinal facies type" conodont faunas.Also discussed is the problem on the Permian-Triassic boundary.