During the dry season, soil particles and plant matter would have settled slowly to the bottom of the shallow lakes and swamps, eventually forming the blue clays and lignite.
英
美
释义
乾季时,土壤颗粒及植物缓慢沉淀到浅水湖泊及沼泽底部,最后形成蓝色的黏土及褐煤。
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