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整個二疊紀華南均有含煤沉積發(fā)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(fā)育的一個巖段，分布于揚子區(qū)的大部以及東南區(qū)毗鄰揚子區(qū)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(wěn)定。地層厚度一般為10～30m，薄者僅數(shù)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。上一頁 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [30] [31] [32] [33] [34] [35] [36] [37] [38] [39] [40] [41] [42] [43] [44] [45] [46] [47] [48] [49] [50] [51] [52] [53] [54] [55] [56] [57] [58] [59] [60] [61] [62] [63] [64] [65] [66] [67] [68] [69] [70] [71] [72] [73] [74] 下一頁 |
