It is the unsolidified sediment consisting of disordered kaolinite and small amount organic matter and lignite materials.
常含少量有机质或与褐煤矿层等伴生。
固
It is the unsolidified sediment consisting of disordered kaolinite and small amount organic matter and lignite materials.
常含少量有机质或与褐煤矿层等伴生。
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