The result provides a foundation of exact time for the high precision stratigraphic subdivision and coal-forming period in Eastern Heilongjiang Province.
这一研究成果为黑龙江省东部早白垩世高精度地层划分对比及成煤期次的确定提供了精确的年代依据。
On the basis of mass borehole data, the paper analyzed Middle Jurassic coal-bearing strata distributing features, coal-bearing property, coal-forming period in the Yining basin.
以大量钻孔资料为基础，研究了伊宁盆地中侏罗统含煤地层的分布特征、含煤性、聚煤期。
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.
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 period and area of tectonic turning are essential controlling factors for the forming of coal.
构造转折期与构造转折部位是控制煤层形成的重要因素。
The period and area of tectonic turning are essential controlling factors for the forming of coal.
构造转折期与构造转折部位是控制煤层形成的重要因素。
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