辽西建昌盆地九佛堂组珍稀化石层的划分与对比

为研究热河生物群的鸟类、爬行类和被子植物的早期演化、辐射迁移、生物多样性及其协同进化,笔者在建昌盆地测制了九佛堂组剖面,并系统采集了以珍稀化石为重点的生物化石。结合前人研究成果,将九佛堂组自下而上分为第一段至第三段,其中九佛堂组第一段西店层含鸟类、爬行类和龟类等珍稀化石,尚见介形类化石Cypridea decorosa,C.jianchanensis,Yumenia jianchanensis,Limnocypridea slundensis,L.levigata,L.rara等,表明该层的介形类化石与喀左九佛堂小孤山—烧锅地剖面及朝阳县波罗赤小北山—黄道营子剖面的九佛堂组第一段下部介形类化石组合面貌基本一致,其所在层位亦应相当。

Division and correlation of precious fossil-bearing beds of the Jiufotang Formation in Jianchang Basin western Liaoning, China

For studying birds,reptiles and angiosperms early evolution,radiation movement,biodiversity and synergetic evolution,authors measured a part of the Jiufotang Formation section,and systematically collected in precious fossils as key-point object. As a research results,this paper synthesize predecessors results,the Jiufotang Formation of the Lower Cretaceous is divided into 1st to 3rd members in ascending order. In which,Xidian bed of 1st member of the Jiufotang Formation contains birds,reptiles and turtles precious fossils. There also found many ostracods:Cypridea decorosa,C. jianchanensis,Yumenia jianchanensis,Limnocypridea slundensis,L. levigata,L. rara etc. These ostracods fossil assemblages indicate that this bed can correlate with section of Xiaogushan-Shaoguodi Jiufotang Kazuo and lower part of 1st member of the Jiufotang Formation at Xiaobeishan-Huangdaoyingzi section of Boluochi Chaoyang Country,both horizons are approximately same.