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The top part of the Kuniutan Formation in the Dacao section at Chengkou, Chongqing in the northern part of the Yangtze Platform contains the conodonts Baltoniodus variabilis (Bergström), B. variabilis(Bergström)-B. gerdae (Bergström) transitional form, B. cf. alobatus (Bergström), Complexodus pugionifer (Drygant), Dapsilodus viruensis (Fåhraeus), Panderodus gracilis (Branson et Mehl), Periodon aculeatus...
The Ordovician was a critical period of the Phanerozoic with great biotic and environmental revolutions. During the transition from Middle to Late Ordovician, marine organisms including graptolites, brachiopods, and trilobites etc. experienced significant replacements and turnovers, along with the cooling of climate and eustatic fluctuations. Herein, we conduct a stable isotope analysis of the Middle–Upper...
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