摘要
Almost seven decades have elapsed since the establishment of the Chouniugou Formation. This formation used to be considered as a mark for the recognition, division and correlation of the Late Visean biostratigraphic unit in China due to its abundant marine biotas such as gigantoproductids and coral Yuanophyllum. Although many geologists and palaeontologists had reinvestigated the typical section of this formation, they came to
