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The conodont biostratigraphy of the lower part of the Beiliu Formation at the Nalai, Guangxi is described. The association of Polygnathus serotinus, P. cooperi cooperi, P. cracens, P. linguiformis bultyncki and Bipennatus cf. B. montensis indicates that this stratigraphic interval, in which one Zdimir bed crops out, can be assigned to the serotinus Zone. Bipennatus cf. B. montensis, which closely resembles B. montensis from the Eifelian costatus Zone, is recorded from a relatively lower leveldoi:10.3140/bull.geosci.1660 fatcat:wmpzbqyb5ffz3lcrn7iryrqdeu