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盆地发育时间短(主要集中在第四纪)、成岩时间短、成岩程度低的三角洲沉积形成了这里优越的聚集条件。
The delta deposit characterizing short basin growth time (it's mainly concentrated onto Quaternary), short lithogenous time and low lithogenous level forms an excellent accumulation condition here.
中侏罗世早期是全区重要的成煤期,下窑坡组为湖泊—三角洲及沼泽相。
The early Middle Jurassic was an major coal-forming period in the region, when the Lower Yaopo Formation of lacustrine-deltaic and swamp facies was deposited.
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