Palynology of the Lower Permian Dazhuyuan and Liangshan Formations in Wuchuan - Zheng'an - Daozhen area, northern Guizhou Province

The materials in this paper were collected from the Lower Permian Dazhuyuan and Liangshan Formations in Wuchuan - Zheng'an - Daozhen area, northern Guizhou Province. The sporo-pollen assemblages are diverse, abundant, and well preserved in Liangshan Formation, but conversed to those in Dazhuyuan Formation. The palynological characteristic of the mentioned Formations can be summarized as follows: (1) The miospore populations of the Dazhuyuan Formation contain examples of species such as abundant Calamospora and Florinites, a little Torispora verrucosa, Gulisporites, Alisporites, Hamiapollenties and Striatopodocarpites, mainly occurring in the Upper Carboniferous to Lower Permian. According to the stratigraphic position of the Dazhuyuan Formation and miospore collected, its age should be correspond to the Early Permian Asselian to Artinskian (equivalent to the Zisong-Longlin stage). (2) The Liangshan Formation contains miospores collectively named Laevigatosporites vulgaris-Gulisporites-Florinites oval- is asse