| 江苏丹徒大力山二叠—三叠系界线层的牙形刺 |
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| 引用本文： | 祁玉平.江苏丹徒大力山二叠—三叠系界线层的牙形刺[J].微体古生物学报,1997,14(3):350-356. |
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| 作者姓名： | 祁玉平 |
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| 作者单位： | 江苏石油勘探局地质科学研究院 |
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| 摘 要： | 本文简要报道了江苏丹徒大力山二叠－三叠系界线层剖面中所产的丰富的牙形刺（计７属１３种及３个未定种）、腕足类、鱼鳞及鱼牙化石，讨论了二叠－三叠系生物地层界线的划分，并对牙形刺的３个未定种进行了描述，对江苏二叠－三叠系生物地层界线的划分具有重要意义。
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| 关 键 词： | 牙形刺 二叠－三叠系界线 江苏丹徒 |
DISCOVERY OF PERMIAN PRO GONDWANAN FACIES IN WESTERN MARGIN OF SIMAO MASSIF AND ITS SIGNIFICANCE |
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| Nie Zetong,Liang Dingyi,Song Zhimin,Jiang Jianjun,Nie Wei.DISCOVERY OF PERMIAN PRO GONDWANAN FACIES IN WESTERN MARGIN OF SIMAO MASSIF AND ITS SIGNIFICANCE[J].Acta Micropalaeontologica Sinica,1997,14(3):350-356. |
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| Authors: | Nie Zetong Liang Dingyi Song Zhimin Jiang Jianjun Nie Wei |
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| Institution: | Nie Zetong 1) Liang Dingyi 1) Song Zhimin 1) Jiang Jianjun 2) Nie Wei 3) |
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| Abstract: | From the basal Longdonghe Formation by the Xiaoheijiang river 40km west of Simao city, recently there has been discovered the earliest Permian Stereochia litostyla (brachiopod) assemblage and diamictite formed by seasonal ice action. It proves that the Longdonghe Formation belongs to the pro Gondwanan facies. The strata overlying the Longdonghe Formation are the Permian Maokou Daxinshan Formation composed of rift deposits intercalated with the basalts of pro oceanic or oceanic origin. These deposits differ decidedly from those of the Simao massif. Hence, the Longdonghe Daxinshan area should belong to the Lancangjiang belt. The boundary between the Gondwana Tethys and the Yangtze Tethys should pass through the line joining Zhulinxiang Jinggu northward to connect the northern Lancangjiang Bitu belt and southward to connect the Nan river. Post Late Maokouan in western Yunnan this boundary shifted again westward to join the line along Changning Menglian. |
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| Keywords: | Early Permian pro Gondwanan facies western Simao massif |
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