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江苏南部的下、中侏罗统,长期以来笼统称之为象山群。本文根据地层岩性特征和大量动植物化石的研究,结合与邻区地层之对比,将江苏南部下、中侏罗统进一步划分为下侏罗统南象山组及中侏罗统北象山组;前者为含煤地层,大致相当于原象山群下部(或下段为),后者为红色地层,大致相当于原象山群上部(或上段)。
Lower and Middle Jurassic in southern Jiangsu have long been generally referred to as Xiangshan Group. Based on the lithologic characteristics of stratigraphy and the study of a large number of animal and plant fossils, the lower and middle Jurassic in the southern part of Jiangsu Province are further divided into the Nanxiangshan Formation of the Lower Jurassic and the North Xiangshan Formation of the Middle Jurassic in comparison with the strata of the adjacent areas. The former is Coal-bearing strata, roughly equivalent to the lower part of the original Xiangshan Group (or the lower part), the latter is a red formation, roughly equivalent to the upper part of the original Xiangshan Group (or the upper part).