ABSTRACT: High–resolution microbiostratigraphy has identified six conodont zones and five coeval radiolarian zones in the Guadalupian–Lopingian (G-L) transitional interval from a section of middle and upper Permian pelagic cherts at Dachongling, near Qinzhou city in Guangxi, South China. The basal Lopingian GSSP at Penglaitan, South China, is correlated with the base of bed Dch 45-21 at Dachongling on the basis of the first occurrence of the conodont Clarkina postbitteri postbitteri Mei and Wardlaw. The first appearances of the radiolarians Albaillella yamakitai Kuwahara and A. cavitata Kuwahara at the same level indicate that both FADs can be used for identifying theG–L boundary in radiolarian-bearing pelagic cherty facies. The appearance of both radiolarian species in the sections at Sasayama, Gujo-Hachima in Southwest Japan, and in the Quinn River Formation of north-central Nevada, indicates that both boundary-index fossils can be traced worldwide. We therefore suggest that Dachongling secion is a good candidate as an auxiliary reference section for the Guadalupian-Lopingian boundary.
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