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苏、浙、皖地区的龙潭组,分布广泛,发育颇全,化石丰富,并含有重要煤层,是研究我国南方龙潭组良好的地区之一。在无锡堰桥、苏州洞庭西山及湖州敢山一带,原属龙潭组下部不含煤段之顶的砂质灰岩中,发现了茅口晚期标准的新米斯筵类动物群(Neomisellinafauna)。1961年,江苏省地质局马景芬根据这一(虫筵)类,提出将该段地层(包括孤峰组)划分出来,名为堰桥组。其后,作者与马景芬等共同对无锡堰桥、长安桥及苏州洞庭西山地区
The Longtan Formation in the Jiangsu, Zhejiang and Anhui regions is widely distributed and developed with abundant fossils and important coal seams. It is one of the good areas for studying the Longtan Formation in southern China. In the weir bridge in Wuxi, Suzhou Dongting Xishan and Huzhou Guanshan area, originally belonging to the lower part of the Longtan Formation, the Neomisellina fauna (Late Maokou Group) was found in the sandy limestone at the top of the No. In 1961, Jiangsu Province Geological Bureau Ma Jingfen according to this (worm feast) class, proposed that the strata (including the group) isolated, named weir bridge group. Later, the author and Ma Jingfen common weir bridge in Wuxi, Chang’an Bridge and Suzhou Dongting Xishan area