Abstract: Three early vertebrates (galeaspids Sanqiaspis zhaotongensis Liu 1975, Lungmenshanaspis yunnanensis sp. nov., and an undetermined osteolepid), were described from the Early Devonian of Bianqinggou, Zhaotong District, northeastern Yunnan. It is argued that the fish-bearing formation could be directly correlated with the Posongchong Formation in Guangnan and Wenshan, southeastern Yunnan, and might be named as the Posongchong Formation, rather than the "Cuifengshan Formation". The Posongchong Formation of Bianqinggou yields abundant remains of early vertebrates including galeaspids, antiarchs, petalichthyids and sarcopterygians. Four genera of galeaspids have been described from this formation, i.e., Sanqiaspis (Liu, 1975; this paper), Qingmenaspis (Pan & Wang, 1981), Zhaotongaspis (Wang & Zhu, 1994), Lungmenshanaspis. As to the galeaspids, the Posongchong Formation of Zhaotong District is most similar to the Pingyipo Formation of Jiangyou, Sichuan. Both Lungmenshanaspis and Sanqiaspis are exclusively found in these two regions, indicating the presence of biogeographic connection.