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The Flora from the Middle Jurassic Yan'an Formation in the Northeastern Margin of Erdos Basin and Discussion on the Palaeoclimate

GE Yu-hui,SUN Chun-lin,LIU Mao-xiuCollege of Earth Sciences,Jilin University,Changchun 130061,China  
The Middle Jurassic Yan'an Formation in the Northeastern Margin of Erdos Basin belongs to a succession fluvial and shore facies middle-fine grained feldspar sandstone,siltstone(pelitic siltstone),black shale,claystone intercalated with coal seams,in which there occur many plant fossils of 39 species belonging to 20 genera.It is considered that the fossils belong to the North Floristic pro-(vince) represented by Coniopteris-Phoenicopsis in the early Middle Jurassic.This indicates that the Northeastern Margin of Erdos Basin had a slightly humid and warm climate condition in the age of the Middle Jurassic.
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