河北泥河湾盆地晚新生代介形类生物地层  

LATE CENOZOIC OSTRACOD BIOSTRATIGRAPHY OF THE NIHEWAN BASIN,HEBEI PROVINCE

作　　者：庞其清[1] 谷振飞[1] 

机构地区：[1]石家庄经济学院,河北石家庄050031

出　　处：《微体古生物学报》2011年第1期55-97,共43页Acta Micropalaeontologica Sinica

摘　　要：通过河北阳原、蔚县泥河湾盆地晚新生代20余条剖面介形类生物地层的调查研究,发现非常丰富的介形类化石,计23属60余钟,自下而上可明显地划分为5个介形类化石组合带:1.Potamocypris plana-Candoniella-Il-yocypris组合带;2.Leucocythere-Ilyocypris-Candoniella组合带;3.Leucocythere-Cytherissa-Li mnocythere组合带;4.Ilyocypris-Li mnocythere flexa-Li mnocythere dubiosa组合带;5.Li mnocythere dubiosa-Li mnocytheresancti-patricii-Ilyocypris组合带。根据以上5个介形类化石组合带的分布,第1组合带及所含地层红崖村组和石匣组的时代为上新世;第2-4组合带和所含地层泥河湾组的时代为早更新世;第5组合带为中-晚更新世,分布于虎头梁组和许家窑组,虎头梁组置中更新世为宜,许家窑组为晚更新世。Very abundant Ostracoda fossils were found in the Nihewan Basin from more than twenty Late Cenozoic sections and drilling cores.They contain 60 species in 23 genera and may be subdivided into 5 assemblage zones（in ascending order as follows）：Zone Ⅰ Potamocypris plana-Candoniella-Ilyocypris assemblage zoneThis assemblage zone is distributed in the Upper Shixia Formation and a few fossils are found in the Upper Hongyacun Formation and mainly represented by Potamocypris plana Schneider,P.cf.horrida Schneider,Candoniella mirabilis Schneider,C.albicans（Brady）,and a few Ilyocypris bradyi Sars,I.gibba（Ramdohr）,I.dunschanensis Mandelstam,I.cornae Mandelstam,Candona lantianensis Lee,Candoniella suzini Schneider and Eucypris cf.decurta Schneider.Zone Ⅱ Leucocythere-Ilyocypris-Candoniella assemblage zoneThe assemblage zone is distributed in the Lower Member of the Nihewan Formation and the appearance of genus Leucocythere is its characteristic.The fossils of the assemblage zone consist of 28 species in 11 genera and mainly represented by Leucocythere mirabilis Kaufmann,L.exilitropis Huang,L.buranensis Huang,Ilyocypris spp.,Candoniella spp.,Candona spp.,Heterocypris spp.,Eucypris spp.,Cyclocypris sp.,Cypridopsis sp.,Zonocypris sp.,Darwinula stevensoni（Brady et Robertson）and Tanella opima Chen.Zone Ⅲ Leucocythere-Cytheressa-Limnocythere assemblage zoneThis assemblage zone is distributed in the Middle Member of the Nihewan Formation.It is characterized by the occurrence of Limnocythere flexa Negadaev and mainly represented by 28 species in 11 genera：Leucocythere mirabilis Kaufmann,L.burangensis Huang,Cytherissa lacustris（Sars）,Ilyocypris spp.,Candona spp.,Candoniella spp.,Cyclocypris sp.,Eucypris spp.,Heterocypris sp.,Cyprideis sp.and Darwinula stevensoni（Brady et Robertson）.Zone Ⅳ Ilyocypris-Limnocythere flexa-Limnocythere dubiosa assemblage zoneThe assemblage zone appered in the Upper Member of the Nihewan Formation.The fossils of the assemblage zone mainly consist of 18 species in 9 gener

关 键 词：介形类 生物地层 晚新生代 泥河湾盆地 河北 

分 类 号：Q913[天文地球—古生物学与地层学]