华北地台北缘亮甲山组地层中发育有六种碳酸盐米级旋四层序；
Six types of the metre-scale carbonate cycles are recognized in the Ordovician Liangjiashan Formation on northern North China platform.
华北地台北缘亮甲山组地层中发育有六种碳酸盐米级旋四层序；
Six types of the metre-scale carbonate cycles are recognized in the Ordovician Liangjiashan Formation on northern North China platform.
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