Abstract: Lower Devpnian stratigraphy of Qujing in eastern Yunnan is a non-marine strato-type in South China and can be subdivided into Xishancun, Xitun, Guijiatun and Xujiachong Formations in ascending order. This sequence is rich in fossils of early vertebrates, bivalves, ostracods and plants. With the early vertebrates, the aspects of Xishancun and Xitun Formations are fairly definite while those of Guijiatun and Xujiachong Formations are equivocal, restraining the establishment of complete early Devonian biostratigraphic succession. In the paper, the new discoveries of early vertebrates from Guijiatun and Xujiachong Formations have been described, i.e., galeaspid Gantarostraspis geni in Xujiachong Formation, and antiarchs Yunnanolepis chii, Procondylolepis quiingensis and crossopterygian Youngolepis sp. in Guijiatun Formation. With the new findings, the early vertebrate fauna of Lower Devonian in Qujing have been summarized. It is suggested that the early vertebrates in Early Devonian of China could be divided into four assemblages, in ascending order (Table 1), that (4) Kueichowlepis-Sinopetalichthys assemblage; (3) Sanchaspis-Asiaspis-Pterogonaspis assemblage; (2) Procondylolepis-Chuchinolepis assemblage; (1) Polybrachiaspis-Laxaspis assemblage. In Qujing area, the fourth assemblage is absent, implying the deficiency of the part or entire Emsian sediments. The correlation between Xujiachong Formation, Posongchong Formation, Nakaoling Formation has been analyzed, using the available early vertebrate data. It is also argued that Lianhuashan Stage could not be the first local chrono-stratigraphic unit in the Devonian of South China.

摘要： 本文记述了云南曲靖地区下泥盆统地层中新发现的早期脊推动物化石，它们是桂家屯组中的胴甲鱼类Yunnanolepis chii, Procondylolepis qujingensis，总鳍鱼类Youngolepis sp.,以及徐家冲组中的盔甲鱼类Gantarostrataspis geni。在化石描述的基础上，讨论了有关的生物地层对比问题，并对中国南方早泥盆世早期脊推动物化石组合序列进行了总结。