说明：
Hongdi-wanbao basin occuring early Jurassic（Hongqi Formation）and middIe-Jurassic（Wanbao Formation）Coal bearing strata with the maximum thic4 ...展开
-ness about 1000m and 700m，which developed on the fold basement of permion is located in north west of Tao nan City，Jilin province． 收起
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