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安徽怀宁地区位于大别山东南侧,地层区划属于扬子地层区下扬子分区怀宁小区。据以往资料记载,这个小区以缺失下石炭统为其特征之一(安徽省地层表编制小组,1978)。1979—80年,我们在怀宁县城西北13公里处的龙王山北坡,发现含早石炭世动物群地层。这套地层假整合于上泥盆统五通组之上,直接伏于下二叠统栖霞组底部碎屑岩段之下,总厚23米。此处地层倒转,剖面层序自上而下为:
Huaining Anhui Province is located in the southeastern side of the Dabie Mountains. The stratigraphic division belongs to the Huaining Residential Area, a sub-district of the Yangtze Sub-region. According to historical records, this area is characterized by the absence of Lower Carboniferous (Anhui Formation Formation Table, 1978). From 1979 to 1980, we found the strata of the Early Carboniferous fauna in the northern slope of the Longwang Mountain, 13 kilometers northwest of Huaining County. The fossil assemblage fits over the Upper Devonian Wutong Formation and plunges directly below the clastic rock fragments at the bottom of the Qixia Formation in the Lower Permian for a total thickness of 23 meters. Here stratum inversion, section sequence from top to bottom: