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牙形石是一类在地层学研究中具有重要意义的古生物化石。Conodont is an important kind of fossil in the stratigraphy research.

牙形石的三个繁盛期与古地磁极性倒转有关。Three prosperous periods of conodont have relation to Palaeomagnetism Reversal.

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本文对深海硅质岩系中这一界线地层牙形石动物群特征进行了简要的描述。We also concisely described the characteristics of the conodont fauna through the boundary strata.

根据所含化石确定地层形成时代为泥盆纪至二叠纪。According to the conodont and fusulinid fossils, their ages are determined to be Devonian -Permian.

对江西省信丰县铁石口剖面晚二叠世长兴阶至铁石口阶下部的牙形石动物群有了新的认识。A detailed research has been worked on the Late Upper Permian conodont fauna of Tieshikou section in Xinfeng area, Jiangxi Province.

三个衰退期受到地史时期中的二大冰期，五次海平面变化和大气降雨量的影响。Three failing periods of conodont are influenced by two ice ages, five sea-level changes and rainfalls in the geological history time.

主要生产适合各种电动自行车、三轮车使用的铅酸、胶体蓄电池，旗下产品分武世、悍将两个品牌。Main production suitable for all kinds of electric bicycle, tricycles, use of lead-acid battery, its products conodont and midfielder two brands.

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结合古地磁和构造地质资料分析，作者认为范家屯组中的牙形刺动物群生活于二叠纪北温带温凉的水域。Based on palaeomagnetic data and tectonic analysis, the present authors concluded that this conodont fauna were from Permian Northern Temperate Zones.

塔中88井首次发现了中奥陶世晚期和晚奥陶世早期斜坡相牙形石化石，地震、测井资料进一步证实，塔中88井存在上奥陶统吐木休克组及中奥陶统一间房组。In Tazhong-88 Well, the conodont fossils in the late of Middle Ordovician and the early of Late Ordovician slope facies have been found for the first time.

以镜质体反射率、热解、牙形刺、孢粉作为划分的主要依据，研究了金衢盆地上震旦统和古生界烃源岩的演化程度。The content of this text is studying evolutive degree of the source rock of the upper Sinian and the Paleozoic group mainly by vitrinite, pyrogenation, conodont and sporopollen.

通过牙形石生物相分析，推断温古尔地区中二叠世早期可能为盆地相较深水沉积环境。Based on an analysis of the conodont biofacies, it is inferred that there was probably a deep-sea basin facies sedimentary environment in the Wenguer area during the early Middle Permian.