| 内蒙古河套盆地晚白垩世地层新资料 |
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| 引用本文： | 蔡友贤.内蒙古河套盆地晚白垩世地层新资料[J].地层学杂志,1988(4). |
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| 作者姓名： | 蔡友贤 |
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| 摘 要： | <正> 河套盆地白垩系—第三系发育,缺失古新世一早始新世沉积。过去因化石资料不足,仅依据地震反射层特征把晚白垩世地层误划入始新一渐新世。笔者等(1985)采集8口钻孔微体古生物样品,获得较多的介形虫及孢粉等,将其划入晚白垩世,新建毕克齐组(K_2b)和杭锦组(K_2h),时代为康亚克期—马斯特里赫特期。
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New data on the Late Cretaceous strata of the Hetao basin of Nei Mongol (Inner Mongolia) |
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| Abstract: | Two terrestrial sedimentary rock formations occur in the Hetao basin of Nei Mongol (Inner Mongolia). Because of lack of sufficient fossils in the past, they were assigned 1.0 the Early Eocene to Oligo-cene. Recently they are reassigned to the Late Cretaceous based on the ostracodes Cypndca globua, Rhinocypris prodigiosa, Quadracypris sp. and sporo-pollen Schizaeoisporites (30%), Zlivisisporites spp., Multinodisporites praeculius,Proteaciditcs (25.3%), Callistopollenites radiastriatus.Crassimarginpollenites (6.1%), Morinopollenites spp., Extratriporopollenites spp. Two new stratigraphical units, the Bikeqi and hangjing Formations, have been established. The former belongs to the Coniacian to Santonian and corresponds to the Nenjiang Formation in the Songliao basin, Erliandabusu Formation in the Erlian basin and the latter belongs to the Campanian to Mastrichtian and corresponds to the Sifangtai and Mingshui Formations in the Songliao basin. |
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