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内蒙古自治区正镶白旗宝立根陶海一带,在新生界之下赋存有含煤地层。前人将其确定为下白垩统巴彦花组,并以不整合关系置于上侏罗统张家口组之上。本文利用最新钻探和地震资料,从孢粉化石组合、地层层序、含煤地层岩性和地震剖面波组特征等方面综合分析后,认为这套含煤地层位于张家口组之下,层位与大兴安岭中—南部地区的红旗组、万宝组,二连地区的阿拉坦合力群以及冀北的下花园组相当,时代应为早—中侏罗世。
Inner Mongolia Autonomous Region is set white flag Baoligen Taohai area, under the Cenozoic exudes coal-bearing strata. Its predecessors identified it as Lower Cretaceous Bayanghua Formation and placed it unconformably on the Upper Jurassic Zhangjiakou Formation. Based on a comprehensive analysis of sporopollen fossil assemblages, stratigraphic sequences, lithology of coal-bearing strata and seismic characteristics of seismic sections in this paper, we use the latest drilling and seismic data to consider that this coal-bearing formation is under the Zhangjiakou Formation. The Hongqi Formation, Wanbao Formation in the middle-southern Daxinganling Mountains, the Alathan Hercules Group in the Erlian area and the Xiahuayuan Formation in the north of Hebei Province are quite similar. The era should be Early-Middle Jurassic.