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苏浙皖地区上、下石炭统之间普遍地有一套白云岩。它是长江下游地区铁铜矿产的主要控矿层位之一,但其时代、层位关系等问题,至今尚未解决。 这套白云岩均伏于“黄龙灰岩”上部结晶灰岩之下,如果不从化石群上辨认,仅依据岩性和层位对比,都会认为是属同一时期沉积的白云岩。但从目前资料来看,白云岩层中产有相当丰富的牙形石、(竹蜓)和珊瑚化石,而且都是一些重要分子。其化石组合面貌却大致以宿松、怀宁、无为、丹阳以北一线为界,形成东南(称南区)、西北(称北区)
Jiangsu, Zhejiang and Anhui areas, generally between the Lower Carboniferous dolomite. It is one of the major ore-controlling layers of iron-copper deposits in the lower reaches of the Yangtze River. However, its age and the relationship between layers have not yet been solved. This dolomite, which lies beneath the upper crystalline limestone of the “Huanglong limestone” and is not recognized from fossil groups, is considered to belong to dolomite deposited in the same period solely on the basis of lithology and stratigraphic correlation. However, from the current data, Dolomite rock is rich in conodont, (bamboo dragonfly) and coral fossils, and are some important elements. Its fossil assemblage is generally Susong, Huaining, Inaction, Danyang north of the line as the boundary, the formation of the southeast (called South), Northwest (North)