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東部以閩西南的龍巖、永定為代表，含煤地層稱童子巖組，巖性可分為三段，下段為細(xì)砂巖、粉砂巖及煤層，厚240m，含可采煤層6層；中段為海相段，由粉砂巖及黑色泥巖組成，厚130m，不含煤；上段由砂巖、粉砂巖及煤層組成，厚400m，含可采煤層6層。本組動(dòng)植物化石均極豐富，而且上、下段中也含海相動(dòng)物化石，由于其中菊石Shouchangoceras, Altudoceras, Polydiexodina 以及植物Taeniopteris multioruis等，因此時(shí)代屬中二疊世晚期即茅口期，相當(dāng)卡贊階。和閩西南同期的含煤沉積除福建各地外還可以包括粵東、粵中、浙西和贛東，在東南沿海形成一個(gè)沉積區(qū)，只是向東陸相成分增多。在含煤性方面也以閩西南為優(yōu)，其他則均較差。上一頁(yè) [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(yè) |
