J Integr Plant Biol. ›› 1978, Vol. 20 ›› Issue (3): -.

• Research Articles •    

The Sporo-pollen Assemblage of Shezhe Formation of Yipinglang Coal Series in Luquan of Yunnan and its Stratigraphical Significance

Lei Zuo-qi   

Abstract: The Shezhi Formation of Yipinglang coal series consists mainly of arenaceous shale and carbonaceous shales with medium-grained sandstones in the basal part. The total thickness of the formation amounts to 203.9 metres. The shales are rich in fossil Sporo-pollen and plants. The fossil spores and pollen contain 55 genera and 74 species, including 19 new species. The Sporo-pollen assemblage of the Shezhi Formation is characterized by the absolute predominance of the spores of pterdophyta (54.5%) and the pollen of gymno-sperms (45.5%). The spores are characterized by the abundance of Dictyophyllidites, Cyathidites, Concavisporites, by the diminution of Leiotriletes, Converrucosisporites, Granulatisporites and Cibotiumspora. The pollen grains are characterized by the abundance of Ricciisporites, Ovalipollis, Cycadopites and Psophosphara, and by the presence of Quadraculina, Podocarpidites, Rhaetipollis and ancient striate conifers. Based on the characters of the Sporo-pollen assemblage and associated occurrence of plant fossils (Dictyophyllum nathoreti, Clathropteris meniscioides, 'Pterophyllum sinese, etc.), the Shezhi Formation may be referred to Norian-Rhaetian stage of Upper Triassic age. According to the flora reflected by the present Sporopollen assemblage and plant fossils, it may be supposed that the climate of the Yunnan Basin in the Late Triassic period was certainly rather warm and wet. It may be referred to tropical- subtropical type similar to that of South-eastern Asia at the present time.

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