【摘要】 平庄─元宝山盆地的晚中生代地层可划分为下白垩统黑水组、元宝山组和杏园组，上侏罗统上那不打组与那不打组。杏园组和元宝山组中含有丰富的植物化石，属于ＲｕｆｆｏｒｄｉａＯｎｙｃｈｉｏｐｓｉｓ植物群的中部组合，可与邻区的主要含煤沉积的植物组合进行对比，时代属早白垩世Ｂｅｒｒｉａｓｉａｎ期至早Ａｐｔｉａｎ期。更多还原

【Abstract】 A detailed explanation for the Late Mesozoic strata in the Pingzhuang Yuanbaoshan coal-basins and their geological age is given. The new classification of the strata is as follows: Lower Cretaceous Heishui, Yuanbaoshan and Xingyuan Formations, Upper Jurassic Shangnabuda and Nabuda Formations. The plant fossils in the Xingyuan and Yuanbaoshan Formations are parts of the middle combination of Ruffordia-Onychiopsis Flora. They can be correlated with the plant combinations of the main coal-bearing Chengzihe Formation-Muling Formation and Shahezhi Formation-Yingchengzi Formation of early-middle Early Cretaceous age in North China. The geological age is regardes to be Berriasian and Early Aptian of the Early Cretaceous. This detemination is illustrated by the oceanous Dinoflagellates, Ancellina and the newly-found Proto-Angiosperinae Floras in the lower part of the Chengzihe Formation in the Jixi basin. The detailed sedimentary features of the strata are also discussed.更多还原