中国东部早第三纪介形虫化石组合及地层对比

PALEOGENE OSTRACODA ASSEMBLAGES AND STRATIGRAPHIC CORRELATION OF THE MAIN DEPOSITIONAL BASINS IN EAST CHINA

我国东部主要盆地早第三纪介形虫,可分为五个组合:上渐新统 Chinocythere unicus-pidata-Dongyingia-Cyprinotus-Cyprois 组合;下、中渐新统 Cyprinotus(Heterocypris)jingheensis-Pinnocypris-Austrocypris-Huabeinia-Chinocythere 组合;上始新统 Cyprinotusigneus-Echinocypris fabaeformis-Limnocythere jiangsuensis 组合;下始新统 Sinocyprisreticulata-Limnocythere weixianensis-Cypris decaryi 组合;上古新统 Sinocypris funing-ensis-Eucypris hengyangensis-Parailyocypris changzhouensis 组合;下古新统 Cypridea(Morinina)xindianensis-Porpocypris-Parailyocypris taizhouensis 组合。归纳为四个发展阶段:(1)中、新生代混生动物群阶段;(2)Sinocypris 动物群阶段;(3)Chinocythere动物群阶段;(4)Dongyingia 动物群阶段。

This paper deals with palaeontologic characteristics of the main Paleogenedepositional basins in east China.Five assemblages and four evolution phasesof Ostracrda can be summarised.Five fossil assemblages:Upper Oligocene Chinocythere unicuspinata-Dongyingia-Cyprinotus-CyproisAssemblage.Lower-Middle Oligocene Cyprinotus(Heterocypris)jingheensis-Pinnocypris-Austrocypris-Huabeinia-Chinocythere Assemblage.Upper Eocene Cyprinotus igneus-Echinocypris fabaeformis-Limnocythere jiang-suensis Assemblage.Lower Eocene Sinocypris reticulata-Limnocythere weixianensis-Cypris decaryiAssemblage.Upper Palaeocene Sinocypris funingensis-Eucypris hengyangensis-Parailyocyprischangzhouensis Assemblage.Lower Palaeocene Cypridea(Morinina)xindianensis-Porpocypris-Parailyo-cypris taizhouensis Assemblage.Four major evolution phases:1.Meso-Cenozoic mixed fauna phase;2.Sinocypris fauna phase;3.Chinocythere fauna Phase;4.Dongyingia faunaphase.According to the contrast of Ostracod assemblages,a conclusion can bedrawn that the formation of Palaeogene depositional basins took place earlierin South China than in the North.