褐煤、腐殖酸、残余植物碎屑和地沥青等是现存有机质的主要类型。
Lignitous coal, humic acid, fragments of plant remnants and asphalt are main forms of existing organic substances.
由于新构造运动的活化，在花岗岩基底上形成了第四纪侵蚀型古河谷，充填了富含有机质的碎屑岩和玄武岩壳。
Due to the neotectonic activation, Quaternary palaeo-valleys that incised the basement were formed on the basement granite and were filled with organic matter-rich clastic sediments and basalt crusts.
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