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江西中部在元古代神山群黑色千枚岩之上，早震旦世古家组砾岩或含砾千枚岩之下，有一套以火山碎屑岩夹酸性火山熔岩为主的地层。这套地层命名为潭头群，自下而上划分为田东组、火峡岭组、上施组，总厚达２０００ｍ。上部２个组产丰富的微古植物化石，时代大部分属于蓟县纪—震旦纪；下部田东组的熔岩测得锆石ＵＰｂ年龄为（１０２７±３６）Ｍａ。根据上述情况，确认潭头群属于新元古代，时限为１０５０～７４０Ｍａ之间。
In the central part of Jiangxi Province, on the black phyllite of the Proterozoic Sacred Mountain Group, there is a stratigraphic layer dominated by volcaniclastic sandstone acid volcanic lava under the Early Sinian Gujialong conglomerate or gravel phyllite. This formation is named Tantou Group. It is divided into Tiandong Formation, Huaxiaoling Formation and Shangshi Formation from bottom to top with a total thickness of 2000m. The upper two groups are rich in microfossil plant fossils, most of the age belongs to Jixian Ji - Sinian; the Lower Tadong Formation lava UbP zircon age (1027 ± 36) Ma. According to the above situation, it is confirmed that the Tantou Group belongs to Neoproterozoic with a time limit of 1050 ~ 740Ma.