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河南灵宝盆地项城群含有丰富的孢粉,由下而上分为Ⅰ、Ⅱ、Ⅲ孢粉组合。Ⅰ、Ⅱ孢粉组合在被子植物中以三孔和多孔粉为主。它们常与桦科、胡桃科和榆科植物有关,还有山龙眼粉、基柱山龙眼粉、鹰粉、刺面三孔粉、克氏粉、正型粉等。第Ⅰ孢粉组合较第Ⅱ孢粉组合裸子植物含量高。时代为古新世。第Ⅲ孢粉组合以具环水龙骨孢占优势,被子植物以三沟、三孔沟粉较多,还出现山龙眼粉、基柱山龙眼粉、刺面三孔粉等。正型粉较前类型增多,但含量不高。时代为晚古新世—早始新世。本文还讨论了:(1)本研究区为我国东北植物区和西北植物区的过渡地带;(2)正型粉在我国的分布规律;(3)第Ⅰ孢粉组合在划分下白垩统至下第三系界限上的意义。
The Xiangcheng Group in Lingbao Basin of Henan Province is rich in sporopollen, which is divided into Ⅰ, Ⅱ, Ⅲ sporopollen from bottom to top. Ⅰ, Ⅱ sporopollen assemblage in the angiosperms to three-hole and porous powder-based. They are often associated with the birch Branch, Walnut Branch and the elm plants, there are longan powder, longan powder base, eagle powder, three-hole powder thorn, kesi powder, powder and so on. The first sporopollen assemblage was higher than the second ¢ ó spore assemblage gymnosperms. The era of the Paleocene. The third spore-pollen assemblage is dominated by Cymbidium spirulina, with three furrows and three furrows in the angiosperms. There are also camellia powder, basalis longan powder and three-hole spike powder. Positive powder increased than the previous type, but the content is not high. Era of Late Paleocene - Early Eocene. This paper also discussed: (1) The study area is the transitional zone between the northeast plant area and the northwest plant area in China; (2) The distribution of the positive powder in China; (3) The combination of the first sporopollen assemblage in the Lower Cretaceous Under the meaning of the third line of demarcation.