以吴家窑剖面为基础，讨论了大同煤田南部晚古生代含煤地层内植物化石的垂向分布特征。认为植物群面貌在小煤与5煤之间发生了重大改变。小峪砂岩之下发育了以Neuropterisouata为代表的早期华夏植物群；其上则出现了许多具二叠纪色彩的植物分子，如Emplectopteristriangulariscladophlebismanchuricus，TaeniopterismultinervisPrecopterisWongiiPtaiyuanensis因此，本区石炭、二叠系界线应置于小峪砂岩之底。 Based on the Wujiayao profile, the vertical distribution of plant fossils in the Late Paleozoic coal-bearing strata in southern Datong coalfield is discussed. The landscape of flora is thought to have changed dramatically between small coal and coal 5. The early Huaxia flora represented by Neuropterisouata was developed under the Xiaoyu sandstone. There are many plant molecules with Permian color on it, such as Emplectopteristriangularis cladophlebismanchuricus, TaeniopterismultinervisPrecopterisWongiiPtaiyuanensis. Therefore, the boundary of Carboniferous and Permian in this area should be placed in small Valley sandstone bottom.