| 论大槽子组和碳山坪组的地质时代 |
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| 摘 要： | <正> 大槽子剖面位于云南省宁蒗县城以南约25km处,是原云南省第二区域地质测量队于70年代发现和测制的,并对泥盆纪地层作了划分、对比和命名。由下而上分别是大瓜坪组、大槽子组、碳山坪组、烂泥箐组和干沟组,其中将大瓜坪组划归早泥盆世晚期,大槽子组和碳山坪组分别与艾菲尔阶和吉维特阶对比,烂泥箐组和干沟组分别与弗拉阶和法门阶对应。大槽子剖面地处泥盆系青藏区和华南区交界处(王钰等1982),且地层发育较
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Geological age of the Dacaozi and Tangshanping Formations |
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| Abstract: | The Dacaozi and Tangshanping Formations, proposed by the Regional Geological Survey Team of Yunnan, are well-exposed at the Dacaozi section of Ninglang county, Yunnan province and characterized by clastic and carboniceous deposits containing a benthic community, such as corals, brachiopods, ostracodes. The Dacaozi Formation has been referred to the Eifelian age, but recent discovery of a number of ostracodes in it indicates a late Emsian age, i. e. this formation may be correlated with all or a part of Sipai Formation in Guangxi. The lower and middle parts of the Tangshanping Formation, which was considered as of the Givetian age, are probably referred to late Emsian to early Eifelian ages according to the ostracode assemblage in them, while the conodont Spathognathodus exiguus (Philip, 1966) obtained from the middle part of this formation generally indicates an Early Devonian age (oral comm. of Wang C. Y.).This paper also has a tendency to refer these formations to the "Xiangzh-ou Type" Devonian sediments due to their similarity to the Ertang, Sipai and Yingtang Formations, typical "Xiangzhou Type" strata, in the lithological features and ostracode assemblages. |
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