山西省石炭系与二叠系界线

THE CARBONIFEROUS─PERMIAN BOUNDARY IN SHANXI PROVINCE

１８８２年李希霍芬在太原西山建立石炭系的太原系含煤建造以来，石炭系与二叠系的分界意见，归纳起来有三：①以Ｐｓｅｕｄｏｓｃｈｗａｇｅｒｉｎａ（ｓ．１）带之底为界，下面为石炭系，上面为二叠系；②以晋东南的灰白色“佳祥砂岩”与太原西山黄绿色“骆驼脖子砂岩”对比，砂岩底面为石炭系与二叠系的分界线，下面是石炭系山西组，上面是二叠系石盒子组，山西组的地层时代定为晚石炭世；③以晋东南灰白色第三砂岩（陵川砂岩）与太原西山“北岔沟砂岩”对比，砂岩底面为石炭系与二叠系的分界线，下面是石炭系太原组，上面是二叠系山西组，山西组的地层时代为早二叠世。笔者认为石炭系与二叠系的划分，以第③方案较适宜。

Since Taiyuan system coal─bearing formation pf the Carboniferous in age in west hill of Taiyuan by Richthofen founded in 18 8 2,the divided scheme of the Carboniferous ─Permianboundary. has not unified until now.To put it briefly,there are three major viewpoints as follows: (1)The base of pseudoschwagerina (s.l)zone is being used as the boundary, then the stratabelow the boundary is the carboniferous and the upper strata of it is the Permian.(2)The grey─white Jiaxiang sandstone in SE Shanxi contrasted with the yellow─greenLuotuohazi sandstone in west hill of Taiyuan, the base of both sandstone regarded as the marks ofthe Carboniferous─Permian boundary. The strata below the boundary is the CarboniferousShanxi Formation and the upper strata of it is the Permian Shihezi Formation. The geologicaltime of Shanxi Formation belongs to the Carboniferous period.(3)The grey─white 3rd sandstone(Lingchuan sandstone)in SE Shanxi contrasted with thegrey─white Beichagou sandstone in west hill of Taiyuan,the base of both sandstone regarded asthe marks of the Carboniferous─Permian boundary. The strata below the boundary is the Car-boniferous Taiyuan Formation and the upper strata of it is the Permian Shanxi Formation. Thegeological time of Shanxi Formation belongs to the Permian period.Author considered that the 3rd scheme of the Carboniferous and Permian is suitable.