Early Cretaceous Angiosperms of the Yanji Basin,Jilin Province

An assemblage of fossil plants was discovered in the Yanji Basin, Jitin Province, consisting mainly of pterid0Phytes, gymnosperms and a few angiosperms. The present paper deals with the angiosperms only; They are: Rogersia angunifolia, Saliciphyllum longifoliurn, Sapindopsis magnifolia, Sterculophyllurn eleganurn, ,Ficophyllum, "Sassafras", Ranunculophyllum pinnatisectum sp. nov., Clernatites lanceolatus sp. nov., and the fruits Carpolithus brookensis, Carpolithus sp. gymnosperm Sequoia as well, all angiosperms having the morphological features of early angiosperms. Most of them are similar to the elements of the Potomac Group in North America and to some extent approach the fossil plants of Neocomian in Mongolia. This assemblage is manifestly different from the Albian flora of Kolyma River (URSS) and Portugal of Europe because of belonging to different stages. Thus, the age of the Dalazi Formation of Yanji Basin is tentatively ascribed to Aptian. The characteristics of this assemblage indicate that the floras of Eurasia and North America had been closely related during the early Mid-Cretaceous and that the early angiosperms were widely distributed in the North Hemisphere. Judging from the characteristics of this assemblage and the deposition, the authors speculate that in Northeast China the climate was warm and humid during the early Mid-Cretaceous.     

吉林省延吉盆地早白垩世被子植物化石

吉林省延吉盆地大拉子组的被子植物化石约有10种。它们具有早白垩世较原始被子植物的形态特征,和北美早白垩世波托马克群的Ⅰ-Ⅱ带的植物分子相同,并与蒙古早白垩世(Neocomian)植物群有些接近,而与苏联、葡萄牙等地的早白垩世(Albian)的被子植物差别甚大,故大拉子组的时代可暂归于 Aptian。植物组合特征说明在早白垩世中期,北半球的欧亚和北美植物区系具有更为密切的关系。并从植物组合及沉积特征分析了古环境。