Abstract:

The present paper is based on the study of conodont sequence of Uppermost Devonian and Lower Carboniferous collected from 15 sections in Guizhou province and adjacent areas of South China.As proposed by the author,the conodont sequence of Uppermost Devonian and the lower part of Lower Carboniferous consists respectively of 7 zones in South China.From below,they are: (Uppermost Devonian) 1.Palmatolepis crepida;2.Palmatolepis rhomboidea;3.Palmatolepis quadrantinodosa;4.Scaphignathus velifera;5.Polygnathus striacus;6.Bispathodus costatus;7.Siphonodella paresulcata;(Lower Carboniferous) 8.Siphonodella sulcata;9.Lower Siphonodella duplicata;10.Upper Siphonodella duplicata;11.Siphonodella sandbergi;12.Lower Siphonodella crenulata;13.Siphonodella isosticha-Upper Siphonodella rcenulata;14.Gnathodus semiglaber-G.cf.coneiformis.They can be well correlated with those of West Europe and North America (for Upper Devonian see Ziegler,W.,1962;for Lower Carboniferous see Sandberg,C.A.et al,1978—Tab.1 and 4).It is suggested that the Devonian-Carboniferous boundary should be drawn between the Siphonodella praesulcata zone and Siphonodella sulcata zone occurring in Muhua section of south Guizhou Province (see table 3).This section and its correlation with those of Guizhou Province and the adjacent areas are shown in fig.4 and 5.Based on the absence of Siphonodella praesulcata and Siphonodella sulcata,the "Wangyou formation" established by Wang C.Y.and Wang Z.H.(1978),may lack the basal part of the Lower Carboniferous sediments Therefore,the author set forth the Muhua formation to substitute the "Wangyou formation".