冀北张家口组、大北沟组的岩石地层学、生物地层学特征及其在东北亚地层划分对比中的意义

冀北张家口组、大北沟组及内蒙古相当地层的岩石地层、生物地层的综合对比研究表明：大北沟组与典型的张家口盆地的张家口组上部相当。大北沟组可以区分出一个Nestoria pissovi叶肢介组合和Ambonella lepida－Jibeilimnadia ovata亚组合、Keratestheria gigantean－Abrestheria rotunda亚组合；介形类可以区分出Luanpingella－Torinina－Eoparacypris组合和Luanpingella postacuta亚组合、Torinina obesa亚组合。生物组合、亚组合的识别为区域地层的划分、对比树立了标准和提供了有效手段。

Lithostratigraphy and biostratigraphy features of Zhangjiakou Formation and Dabeigou Formation and its significance for stratigraphic subdivision and correlation in the Northeast Asia

Comprehensive studies of the Zhangjiakou Formation and Dabeigou Formation in North Hebei and their corresponding strata in Inner Mongolia in terms of lithostratigraphy and biostratigraphy show that the Dabeigou Formation is equivalent with the upper part of typical Zhangjiakou Formation in Zhangjiakou Basin. Conchostracans in Dabeigou Formation can be divided into the Nistoria pissovi assemblage and Ambonella lepida－Jibeilimnadia ovata and Keratestheria gigantea－Abrestheria rotunda sub-assemblages. The ostracods of the Dabeigou Formation can be divided into the Luanpingella－Torinina－Eoparacypris assemblage and the Luanpingella postacuta and Torinina obesa sub-assemblages. By distinguishing these biozones and subbiozones, a standardized and valuable means of stratigraphic division and correlation in Northeast Asia is provided.