Abstract:

This paper deals with the conodonts collected from the Lower-Middle Silu-rian in Guizhou Province,a total of 93 species in 42 different genera havebeen established here,in which 35 new species and 7 new genera aredescribed.The stratigraphical distribution of conodonts allows the recognition of5 assemblage and interval zones in ascending order(See Table 2):1.Spathognathodus obesus ass.zone;2.Interval I(A zone);3.Spathognathodus parahassi-Sp.guizhouensis ass.zone;4.Spathognathodus celloni ass.zone and 5.Interval Ⅱ(B zone).On the basis of characteristic of the Conodont fauna and correlation withconodont sequences of Europe and North America(See Table 3),the Spa-thognathodus obesus ass.zone—Sp.celloni ass.zone are Early Silurian in ageand Interval Ⅱ zone is Middle Silurian.