Suberinite occurs commonly in Mesozoic coal measures and terrestrial organic matter source rocks in Northwest China, which is formed from suberized cell walls, particularly in plant periderm.
西北中生界煤系烃源岩中普遍含有木栓质体，它来源于植物周皮的木栓化细胞壁。
According to traditional viewpoint it is thought that the humic type organic matter can't be found in the Ordovician because of lacking higher terrestrial plants.
传统观点认为由于奥陶系没有陆生高等植物出现，故而不会出现腐殖型有机质。
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