| 广西西湾煤系首次发现牙形刺及其地层意义 |
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| 引用本文： | 冯少南,李志宏.广西西湾煤系首次发现牙形刺及其地层意义[J].南方国土资源,1989(4). |
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| 作者姓名： | 冯少南 李志宏 |
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| 作者单位： | 地质矿产部宜昌地质矿产研究所
(冯少南)，地质矿产部宜昌地质矿产研究所(李志宏) |
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| 摘 要： | 西湾煤系是广西重要含煤层位之一,以碳酸盐岩夹煤层为特征,自下而上分天堂组和大岭组,主要煤层赋存于大岭组中。煤系时代有晚三叠世与早侏罗世之争。1988年笔者之一冯少南,曾报道了天堂组产植物化石Danaeopsis fecunda Halle,为煤系时代归属提供了重要古生物依据。今年笔者在大岭组的灰岩中分析出牙形刺,认为大岭组的时代应属晚三叠世,并进一步说明大岭组为潮坪泻湖→滨海沼泽相沉积。
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| 关 键 词： | 西湾煤系 晚三叠世 牙形刺 广西 |
CONODONTS DISCOVERED FOR THE FIRST TIME IN THE COAL FORMATION OF XIWAN, GUANGXI AND THEIR STRATIGRAPHIC SIGNIFICANCE |
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| Authors: | Feng Shanan and Li Zihong |
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| Abstract: | The coal formation in Xiwan, which is one of the most important in Guangxi, consists of carbonate rocks intercalated with coal seams. It can be divided into two parts: the upper part of it is known as the Daling Formation where the main coal seams occur, and the lower part of it as the Tiantang Formation. Two opinions exist concerning the age of the coal formation. One helds that it should be of Early Jurassic in age, while the other of Tate Triassic. Fen Shaonan, one of the authors, reported Danaeopsis fecunds Hall in the Tiantang Formation in 1988, providing an important paleontological evidence for the age of the coal formation. Not until this year that did the authors recognize conodonts in the limestone of the Daling Formation and determine that the coal formation should be of Late Triassic in age. In addition we have also confirmed that the Daling Formation is compased of tidal flat lagoon facies and littoral swamp facies. |
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| Keywords: | coal formation Late Triassic conodont Xiwan |
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