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安徽省南部晚二叠世早期含煤地层,主要分布在扬子地层区的下扬子地层分区和江南地层分区之中。根据岩性、岩相古地理分布及生物面貌等不同特征,在下扬子地层分区中可进一步划分为巢湖—安庆地层小区和宿松—繁昌地层小区;江南地层分区中划分为广德~休宁地层小区。以往煤田地质系统将上述三个地层小区中的晚二叠世早期含煤岩石地层均称为龙潭组,而我省地矿系统则把龙潭组下部的砂页岩段划出,称为堰桥组或银屏组。本文根据多重地层划分原则,把巢湖~安庆地层小区和广德—休宁地层小区中一套含煤碎屑岩石地层含(银屏组/堰桥组)统称为龙潭组;宿松—繁昌地层小区则称为吴家坪组。
Early Late Permian coal-bearing strata in southern Anhui are mainly distributed in the Lower Yangtze Formation and the Jiangnan Formation in the Yangtze Formation. According to lithofacies, palaeogeographic distribution and bio-physiognomy, the Lower Yangtze Formation can be further divided into the Chaohu-Anqing formation and the Susong-Fanchang formation; the Jiangnan Formation is divided into the Guangde-Xiuning Formation Community. In the past, the geological system of the coalfield referred to the Longtan Formation as the late Late Permian coal-bearing rock formations in the three above-mentioned stratigraphic subdivisions. However, the sand and shale system in the lower part of the Longtan Formation was delineated by the geology and mining system in our province. Group or silver screen group. According to the principle of multiple stratigraphic division, a set of coal-bearing clastic rock strata (Yinping Formation / Yanqiao Formation) in Chaohu ~ Anqing strata and Guangde - Xiuning strata are collectively referred to as Longtan Formation; and Susong - Fanchang strata It is called Wujiaping group.