Late Bashkirian and early Moscovian conodonts from the Naqing section, Luodian, Guizhou, South China

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• 作者：Yu-Ping Qi^a ; ^{ypqi@nigpas.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Lance L. Lambert^b ; ^{lance.lambert@utsa.edu" class="auth_mail" title="E-mail the corresponding author} ; Tamara I. Nemyrovska^c ; ^{tnemyrov@mail.ru" class="auth_mail" title="E-mail the corresponding author} ; Xiang-Dong Wang^a ; ^{xdwang@nigpas.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Ke-Yi Hu^a ; ^{aameko@foxmail.com" class="auth_mail" title="E-mail the corresponding author} ; Qiu-Lai Wang^a ; ^{wangqiulai521@gmail.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Late Bashkirian ; Early Moscovian ; Conodonts ; Naqing section ; South China
• 刊名：Palaeoworld
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：25
• 期：2
• 页码：170-187
• 全文大小：8129 K

文摘

Late Bashkirian and early Moscovian conodonts are abundant and diverse at the Naqing section, South China. All conodont genera known to have numerous species in the late Bashkirian–early Moscovian are recorded here, including Declinognathodus, Diplognathodus, Gondolella, Idiognathodus, Idiognathoides, Mesogondolella, Neognathodus, and Neolochriea. At Naqing, many species of these genera provide a succession of conodont chronomorphoclines throughout the Bashkirian–Moscovian boundary interval. They demonstrate that deposition was remarkably continuous through the boundary interval, a major criterion for selecting a Global Stratotype Section and Point (GSSP). This paper describes the current state of knowledge for several of these chronomorphoclines, and also provides an updated range chart of conodonts recovered from the Naqing section and their correlation with other regions.

The taxon that best matches the current concept for the base of the Moscovian Stage in its type region is the phylogenetic first occurrence of Diplognathodus ellesmerensis. An ancestral form with most of the characteristics of D. ellesmerensis occurs at Naqing. More specimens are needed to completely document the chronomorphocline, but because D. ellesmerensis is found worldwide — including that close to the base of the type Moscovian — its evolutionary first occurrence would provide an almost ideal GSSP to define the base of the international Moscovian Stage.