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一、前言自盛金章在苏南龙潭组下部发现茅口期(竹蜓)类分子以后,在江西铅山、福建、浙西、浙北、广东、湖南及赣南等地先后在龙潭组的下部发现了早二叠世化石,因而上二叠统下界是否上移的问题成为一个十分引人注目的问题。许多古生物地层工作者依据古生物而将龙潭组下部的时代改为早二叠世。但不少地质工作者依据岩石地层特征而主张仍属晚二叠世,后者的主要依据是: (一)在湘中、赣中等地东吴运动表现明显,而官山段及与其相当的地层仅在个别地点发现
I. Preface Since Sheng Jinzhang discovered the Maokou period (bamboo-dragon) -like molecules in the lower part of the Longtan Formation in the southern Jiangsu Province, the lower reaches of the Longtan Formation were successively found in the areas of Qianshan, Fujian, Zhexi, Zhebei, Guangdong, Hunan and Gannan in Jiangxi Province. The discovery of the Early Permian fossils and the question of whether the Lower Permian upper bound moves up becomes a very conspicuous issue. Many palaeontological workers changed the age of the lower part of the Longtan Formation to Early Permian according to paleontology. However, many geologists claim that they are still in Late Permian according to the characteristics of the rock strata. The latter are mainly based on the following findings: (1) In the Central Hunan Province, the performance of the Soochow movement in Jiangxi, Strata found only in individual locations