Early Cretaceous Palynological Assemblage of Jiufengshan Formation in Well Yang-3 in Dayangshu Basin
作者单位：Research Center of Paleontology and StratigraphyJilin University College of Earth SciencesJilin University Geological LaboratoryExploration and Development Research Institute of Daqing Oilfield Company Ltd.
会议名称：《中国古生物学会古植物学分会、江苏省古生物学会2021年学术年会》
会议日期：1000年
学科分类：070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学]
关 键 词：the Dayangshu Basin Early Cretaceous Palynological assemblage Jiufengshan Formation
摘 要：The Dayangshu Basin,as a Mesozoic faulted-basin in Northeast China,extends in NNE *** in the southern depression of the basin,the Well Yang-3 outcropped the Cretaceous non-marine deposits,named as Longjiang,Jiufengshan and Ganhe formations in ascending *** black mudstone samples were collected from the coal-bearing deposit of the Jiufengshan Formation in the horizon(1 804.46～1 896.99 m in depth) of Well *** palynomorphs were recognized in the samples and named as the Osmundacidites-Baculatisporites-Aequitriradite *** is significant in correlation of the Early Cretaceous strata,especially in the regional biostratigraphic correlation of the Jiufengshan *** assemblage is characterized by;①fern spores are diverse,accounting over 70.00% of the palynomorphs;while gymnosperm pollen account for 30.00% and angiosperm pollen are absent.②among the fern spores,Osmundacidites(11.18%),Baculatisporites(7.06%) and Aequitriradites(5.29%) are richest ***(3.53%) and Uvaesporites(3.53%) are *** important genera including Triporoletes,Cicatricosisporites,Foveotriletes,Lygodiumsporites,Yichangsporites,Hsuisporites,Demoisporites,Foraminisporis,Pilosisporites,Leptolepidites and Fixisporites,*** often seen.③gymnosperm pollen are damaged and difficult to be ***,Paleocoliferus,Protoconiferus are *** assemblage is quite similar to the Trilobosporite-Cicatricosisporite-Cycadopites Assemblage established by Pu Ronggan and du Hongzhang(1985)from the coal seams of the Jiufengshan Formation in the Dayangshu Coal-Mine,however,Cycadopites and Trilobosporites were not found in the present samples of the Well *** species of fern spores such as Triporoletes,Cicalricosisporites,Aequitriradites,Yichangsporites,Hsuisporites,Densoisporites are important indicators of Cretaceous age,while others are wide distributed species during Jurassic and Cretaceous time,for examples,Ster