J Integr Plant Biol. ›› 1981, Vol. 23 ›› Issue (6): -.

• Research Articles •    

The Pliocene Sporo-Pollen Assemblage of Huang Hun in Hebei Plain and its Significance in Palaeobotany and Palaeogeography

Li Wen-yi and Liang Yu-lian   

Abstract: An Early Pliocene pollen assemblage from Huang-Hua is situated in the east part of Hebei Plain. The pollen assemblage which has been studied is a basis of considering the plant development of that period. The pollen assemblage shows an aspect of deciduous forest appearance and a concept of "warm-temperate" climate then. The flora is dominated by Ulmus, Quercus and Carya, and some temperate elements such as Abies, Picea, Pinus, Salix, Betula, Carpinus, Juglans, Acer and Tilia are the obvious generally. Except Carya, the subtropical elements: Podocarpus, Keteleeria, Tsuga, Pterocarya, Liquidambar, Hamamelis, Fothergilla and Xanthoxylum are the conspicuous elements in the assemblage, too. However herbs espicially Compositae become more abundant. It is clear that some tropical and subtropical elements such as Proteaceae, Nyssaceae Myrtaceae, Sympolocaceae etc. which were prevalent in early Tertiary are entirely lacking. Owing to the lack of Taxodiaceae instead by Pinaeeae and there are some genus of Composite and Tricoporite rugulates in the assemblage. It is more likely to be early Pliocene period. The assemblage expressed a transitional stage of plants from subtropical to tem- perate zones.

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