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研究了徐州九里山矿区景山3─12孔太原组13层灰岩中的牙形刺分布特征,并讨论其地层意义。
The distribution characteristics of conodonts in 13 limestone rocks of Kongshan group 3─12 Kong Taiyuan in Jiulishan mining area of Xuzhou were studied, and the stratigraphic significance was discussed.