LATEST ORDOVICIAN TO EARLY SILURIAN GRAPTOLITES OF THE DAXICHANG FORMATION IN SINAN,GUIZHOU,CHINA
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Abstract:
Based on graptolite beds of the Daxichang Formation in Sinan, Guizhou, investigated by Yu et al., a study on the graptolite fauna is carried out in the present paper. Seven graptolite species assigned to six genera described herein are Styracograptus chiai(Mu, 1949), Normalograptus mirnyensis(Obut and Sobolevskaya, 1967),Normalograptus ajjeri(Legrand, 1977), Metaclimacograptus hughesi(Nicholson, 1869),Avitograptus avitus(Davies,1929),Atavograptus atavus(Jones, 1909) and Korenograptus laciniosus(Churkin and Carter, 1970). The graptolite beds correspond to the Dicellograptus complexus Biozone, Akidograptus ascensus Biozone and Cystograptus vesiculosus-Coronograptus cyphus Biozone in ascending order. The graptolite fauna is low-diversity composed mostly of global species throughout the Ordovician and Silurian transition, except for one species, Styracograptus chiai(Mu).
