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根据不整合面和岩石组合特征,赣南—粤北晚中生代火山岩系自下而上划分为余田群、莲花寨群和版石群。再根据岩性岩相特征,结合火山旋回分析,余田群、莲花寨群和版石群均可进一步划分为两个组:余田群下部称水头迳组、上部称菖蒲组,莲花寨群下部称上丁组、上部称鸡笼嶂组,版石群下部称合水组、上部称优胜组。菖蒲组的同位素年龄为176～147.6 Ma,峰值为170～160 Ma,属中侏罗世;鸡笼嶂组同位素年龄为154～138 Ma,峰值为150～140 Ma,属晚侏罗世;合水组的化石特征指示其属早白垩世;优胜组同位素年龄为104～72.2 Ma,峰值为86.5～100 Ma,属晚白垩世早期。
According to the features of unconformity and rock assemblage, the Late Mesozoic volcanic rock series from southern Jiangxi to northern Guangdong are divided into Yutian Group, Lianhuazhai Group and Banushi Group from bottom to top. According to the characteristics of lithology and lithofacies, combined with the volcanic cycle analysis, Yutian Group, Lianhuazhai Group and Shiushi Group can be further divided into two groups: the lower part of the Yutian Group called the head group, the upper part of the iris group, and the lower part of the Lianhuazhai Group Group, the upper part of the cages said group, the lower part of the version of stone group that water group, the upper part of the winning group. The iris group has an isotopic age of 176-147.6 Ma and a peak value of 170-160 Ma, belonging to the Middle Jurassic. The isotopic age of the cages is 154-138 Ma with a peak value of 150-140 Ma and belongs to the Late Jurassic. The fossil characteristics of the water group indicates that it belongs to the Early Cretaceous. The Yusun Formation isotope age is 104 ~ 72.2 Ma and the peak value is 86.5 ~ 100 Ma, belonging to the early Late Cretaceous.