| 论北天山西段奥陶纪含笔石地层及笔石群的划分 |
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| 引用本文： | 乔新东.论北天山西段奥陶纪含笔石地层及笔石群的划分[J].新疆地质,1989(1). |
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| 作者姓名： | 乔新东 |
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| 作者单位： | 新疆维吾尔自治区地质矿产局第一区调大队 |
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| 摘 要： | 笔者把下奥陶统新二台组分为三个岩性段,下奥陶统新建五个笔石带、北天山西段以笔石带化石的混生为显著特点,除巳公布的Cardiograptus-Oncograptus混生外,Anisograptus和Triograptus的混生为一新的例证、Anisograptus和Triograptus在我国华南它们分别是新厂期X_1和X_2的笔石带化石,而在果子沟它们上延到相当华南新厂期X_3的层位、此两笔石属的个别分子可继续上延到Tetragraptus(Etagraptus)approximatus带的底部和T.fruticosus带、风沟组被厘定为中奥陶统下部.在科古琴地区发现有中奥陶统上部层位和晚奥陶世地层.
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| 关 键 词： | 笔石 混合 笔石带 下奥陶统新二台组 中奥陶统下部风沟组 中奥陶统上部层位 晚奥陶世地层 北天山西段 |
ON GRAPTOLITE-BEARING STRATA AND THE GRAPTOLITE FAUNA DIVISION OF ORDOVICIAN IN THE WESTERN NORTH TIANSHAN |
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| Qiao Xindong.ON GRAPTOLITE-BEARING STRATA AND THE GRAPTOLITE FAUNA DIVISION OF ORDOVICIAN IN THE WESTERN NORTH TIANSHAN[J].Xinjiang Geology,1989(1). |
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| Authors: | Qiao Xindong |
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| Abstract: | Author has divided the Lower Ordovician Xinertai Formation into three lith-ological members and newly erected five graptolite zones. The graptolite is characteristics of the mixotrophic members in the western North Tianshan.
The new mixture of Anisogratus and Triograptus is another evidence apart from the repoted mixture of Cardiograptus-Oncograptus. Anisograptus and Triograptus in South China represent respectively the graptolite zones X1 and X2 of Xinchang age, while those in Guozigou region are extended upward to the horizon corresponding to the zone X3 of Xinchang age in South China. A few of them are further expended upward to the bottom of T. ( Etagraptus ) zone and T. fruticosws zone.
Fenggou Formation was collated and stipulated to the lower Middle Ordovician. The upper Middle Ordoviocian and Upper Ordovician were discovered in the Kokir-qin region. |
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| Keywords: | graptolite mixture graptolite zone Lower Ordovician Xinertai Formation Fenggou Formation of lower Middle Ordovician upper Middle Ordovician Upper Ordovician western North Tianshan |
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