Sedimentary characteristics of the Permian Longtan Formation in Xingyuan coal mine, Nayong County, Guizhou Province<br>Tian Liang, Peng Tao, Ge Zhengzhi<br>(No.13 Geological Brigade of Guizhou bureau of Geology and mineral resources, 553000 Liupanshui, Guizhou)<br>
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