Late Permian-Early Triassic Palynological Assemblages in Linxi,Inner Mongolia and Discovery of Triassic Strata
Yang Bing
Zhang Xionghua
Ge Mengchun
Zhao Shengmin
Wei Yi
Huang Xing
Luan Tengfei
Wei Xinxiang
Yang Zhiyong
Abstract：Large amount of spores and pollen (mainly consist of pteridophyta spores and gymnospermous pollen),including 54 genera and 90 species,were discovered in the fifth member of Late Permian Linxi Formation,Guandi section,Linxi,Inner Mongolia.The fifth member of Linxi Formation was assumed to belong to the Late Permian,for the preservations of special Late Permian spores and pollen,and biostratigraphic correlations to adjacent areas.9 genera and 9 species were also found from the sixth member of Linxi Formation.They should belong to the Early Triassic,for the existing characteristics of the Early Triassic palynological assemblages.In addition,the lithology of the sixth member of Linxi Formation varies from that of the underlain parts of Linxi Formation,but similar to that of adj acent Laolongtou Formation,for the yielding of purple-gray silty slate and volcanic breccias interbeds.The sixth member of Linxi Formation might belong to the Early Triassic Laolongtou For-mation,evidenced by the integration of lithology,fossils,paleo-climate records and correlations to adjacent areas.The Permian-Triassic boundary is placed in the interval between the fifth member of Linxi Formation and Laolongtou Formation.
Keywords：palynological assemblageLate PermianEarly TriassicLinxi FormationLaolongtou Formationstratigraphy
Publication Date：2014-01-01
Pages：11( 784-794 )