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位于黑龍江東部的含煤地層稱雞西群，自下而上包括滴道組、城子河組和穆棱組。其中滴道組包括火山巖系，屬晚侏羅世；城子河組和穆棱組為含煤巖系，屬早白堊世。城子河組厚600～1 400m，底部為礫巖，中部為碎屑巖和煤層，上部以細碎屑巖為主，夾凝灰?guī)r。一般含可采煤層20余層，單層厚一般1～2m。穆棱組厚300～1 000m，以細砂巖、粉砂巖為主，夾多層凝灰?guī)r，含可采煤層1～9層，總厚3～8m。城子河組穆棱組所含植物化石與前述各區(qū)完全一致，屬早白堊世早期。在三江、穆棱地區(qū)一系列煤盆地以東，于虎林、密山、寶清一帶發(fā)育了海陸交互相的含煤地層，稱龍爪溝群，下部因含北極菊石及海相瓣腮類而屬侏羅紀，上部稱珠山組，所含化石包括海相及淡水瓣腮類以及植物、孢粉等，時代為早白堊世，當(dāng)前認為珠山組可與城子河組及穆棱組相當(dāng)。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 |
