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安徽南部石炭系发育良好、分布广泛、化石丰富,是研究华南地区石炭系的良好地区之一。安徽区调队、南京地矿所、南大地质系、安徽省地质局322队、321队等单位都先后做了一些工作,地层单位名称一直沿用1930～1935年地质界前辈李四光,李毓尧、朱森等研究宁镇山脉地质时所创建的黄龙灰岩——黄龙组。其岩性是,底部为白云岩,下部为厚层粗结晶灰岩,中、上部为灰白或微带红色质纯灰岩。
Carboniferous in Southern Anhui Province is well developed, widely distributed and rich in fossils, and is one of the good areas for studying Carboniferous in southern China. Anhui Province Tiangui, Nanjing Institute of Geology and Mineral Resources, South China University of Geology, Anhui Bureau of Geological 322 teams, 321 teams and other units have done some work, the name of strata has been used in 1930 ~ 1935 geological predecessors Li Siguang, Li Yuyao, Zhu Sen Huanglong limestone-Huanglong Formation, which was created when studying the geological features of Ningzhen Mountains. Its lithology is that the bottom is dolomite, the lower part is thick coarse coarsely crystalline limestone, the middle part and the upper part are gray or reddish pure limestones.