The material source of the Carboniferous karst type bauxite in North China mainly came from the underlying Late cambrian-middle Ordovician carbonate rock.
华北石炭纪岩溶型铝土矿的主要物质来源为下伏的晚寒武世—中奥陶世碳酸盐岩。
2
Permian -carboniferous hydrocarbon source rocks in Nanhuabei basin are widely distributed and have various types, which have offered the good material base for the oil and gas generation.
南华北盆地石炭-二叠系烃源岩分布广泛、类型多样，为油气生成提供了良好的物质基础。
3
The Carboniferous-Lower Permian source rocks are high to very high in maturity, with a wide distribution, great thickness, high content of organic material and better variety.