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陕西黄陵矿区侏罗纪煤系４号煤层中，有厚达４ｍ的特殊煤种（烛煤）。通过煤岩学、孢粉学、有机地球化学等综合研究，认为它是腐植煤与腐泥煤的过渡类型，并更具腐植煤的特征，应归为腐泥—腐植煤成因类型；根据其宏观、微观的结构、构造及显微煤岩类型等特征，认为它是原生泥炭经过搬运到静水湖中堆积而成。
In the No. 4 coal seam of the Jurassic coal measure in the Huangling mining area of Shaanxi Province, there is a special type of coal (candle coal) with a thickness of 4m. Based on the comprehensive study of coal petrology, palynology and organic geochemistry, it is considered as a transitional type of septic coal and sapropelic coal and more of the characteristics of humified coal, and should be classified as the genesis type of sapropel-humus; according to Macroscopical, microscopic structure, structure and the type of micro-coal rock and other characteristics, that it is the original peat transported to the lake after the deposition.