Its Outangdi Formation of the Upper Carboniferous system occurs as mixed deposits of terrigenous clastics and carbonate.
藕塘底组属于上石炭统，是一套陆源碎屑岩与碳酸盐岩组成的混合沉积岩。
Upper Jurassic red bed cover directly on coal measure strata of Permian and Carboniferous system in Yanzhou coal field.
兖州煤田的上侏罗统红层直接覆盖于二叠、石炭系煤系地层之上。
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