Abstract
AbstractThe Upper Ordovician Sandbian to Katian strata from the East Qilianshan (northeastern Tibet Plateau) bear a graptolite fauna of moderately high diversity. Graptolites from theAmplexograptus maxwellibeds to theAppendispinograptus longispinusBiozone (Sa2–Ka4 intervals) proposed herein include 27 species of 13 genera. This important graptolite fauna is first described herein although it was initially reported in 1963. Most of them occur in theA. longispinusBiozone corresponding to theDicellograptus complexustoParaorthograptus pacificusbiozones of the Wufeng Formation in the Yangtze region.Alulagraptusnew genus is established based on the materials from the East Qiqiaogou section. The endemic species, e.g.,Alulagraptus ensiformis(Mu and Zhang in Mu et al., 1963),Dicellograptus sinicusMu and Zhang in Mu et al., 1963, andClimacograptus?papilioMu and Zhang in Mu et al., 1963, could indicate that East Qilianshan block was separated from South China.UUID:http://zoobank.org/84ab69a2-0b56-4ec3-912e-730da08ab10a
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