Abstract: Field survey and laboratory study of the "Zhuzhou conglomerate" at Zhuzhou Village near Dikou Township, Jian'ou City, Fujian, indicate that the "Zhuzhou conglomerate" is neither the basal conglomerate of the pre-Sinian Longbeixi Formation of the Mamianshan Group nor structural brecciate in the pre-Sinian basement, but the basal conglomerate stratigraphically equivalent to the Late Triassic Dakeng Formation (T3d), unconformably overlying the pre-Sinian Dikou Formation. This discovery has great significance for the intensive study of the Precambrian tectonic evolution of the area.