广西德保钦甲早、中泥盆世的牙形刺及其地层对比和指相意义初析

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PRILIMINARY INVESTIGATION ON LOWER AND MIDDLE DEVONIAN CONODONTS FROM THE QINJIA COUNTY IN DEBAO DISTRICT OF GUANGXI AND THEIR SIGINIFICANCE IN INDICATING FACIES

摘要: 牙形刺是一种已经绝灭的微体化石,产于海相寒武——三迭纪地层中。由于它具有个体小,数量多,分布广,演化迅速,分带明显等特点,在地层划分和对比,尤其在海相地层开展石油普查工作中,越来越受到重视。1977年,笔者在一批泥盆系样品中,经分析鉴定后,它们对地层对比及指相分析很有意义。今将德保钦甲剖面中牙形刺情况作一报导。

Abstract: Twenty three species belonging to ten genera collected from Qinjia County in Debao District of Guangxi are described in this paper. Including three new species (Plectospathodus duowenensis;Polygnathus debaoensis and Polygnathus qinjaensis) and four uncertain species. Four zones of Polygnathus (P.dehiscens; P. perbonus; P. inversus; P. serotinus) are found and the the writer suggests that the Qinjia Formation and Debao Formation to be Lower and Middle Devonian in age. The conodonts zones are correlated with related strata of Western Europe and North America. Meanwhile, preliminary investigation on Devonian conodonts and their significance in indicating facies are discussed.

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