整個二疊紀華南均有含煤沉積發育。早二疊世晚期含煤地層稱梁山組，又稱棲霞底部煤系，它是棲霞階(相當空谷階)早期在局部范圍發育的一個巖段，分布于揚子區的大部以及東南區毗鄰揚子區相對隆起的部位。梁山組由細砂巖、粉砂巖、鋁土質泥巖等組成，夾1～3層碳質泥巖或薄煤層，煤厚很不穩定。地層厚度一般為10～30m，薄者僅數米，厚者可超過200m。本組地層常超覆于各老地層之上，呈假整合或不整合接觸。所含植物化石為三角織羊齒-多脈帶羊齒組合，大致可以和華北之山西組相當，屬中期華夏植物群A期，時代為早二疊世晚期或薩克馬爾階。

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