内蒙古自治区额济纳旗雅干地区下白垩统巴音戈壁组化石新发现

丁海生; 雷聪聪; 闫振军; 王文宝; 李卫星; 马军; 薄海军; 李成元; 王振义

doi:10.12097/j.issn.1671-2552.2023.09.012

内蒙古自治区额济纳旗雅干地区下白垩统巴音戈壁组化石新发现

New discovery of fossils from Lower Cretaceous Bayingebi Formation in the Yagan area of Ejina Banner, Inner Mongolia

摘要

摘要: 在内蒙古银额盆地西北部洪果尔吉乌拉山间盆地内首次发现早白垩世叶肢介化石1属2种，包括：Diestheria yixianensis Chen，Diestheria longinqua Chen，植物化石5个属（种）Podozamites sp.，Equisetites sp.，Baiera sp.，Nilssonia sp.，Czekanowskia sp.。上述叶肢介化石均为热河生物群重要分子，植物化石也是中生代晚三叠世—晚白垩世的常见分子，确定这套地层时代为早白垩世，划归巴音戈壁组。上述化石的发现，丰富了银额盆地中生代生物地层学研究内容，为盆地内早白垩世地层对比提供了最新参考资料。

Abstract: This study reports the discovery of the Early Cretaceous conchostracan fossils and plant fossils in the Hongguoerjiwula intermontane basin, northwest of Yingen-Ejina Basin.The conchostracan fossils were founded belong to 1 genus and 2 species named Diestheria yixianensis Chen and Diestheria longinqua Chen.Five genus(species) plant fossils were founded include: Podozamites sp., Equisetites sp., Baiera sp., Nilssonia sp., Czekanowskia sp..The conchostracan fossils mentioned above are very important components of Jehol biota, and the plant fossils are also common components in Mesozoic strata during Late Triassic to Late Cretaceous.Biostratigraphic classification evidence suggests that the era of the strata is Early Cretaceous and incorporated into Bayingebi Fromation.The discovery of these fossils, enriches the research contents of Mesozoic biostratigraphy in Yingen-Ejina Basin, provides the latest reference for the stratigraphic correlation of the Early Cretaceous in the basin.

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