Stratigraphic Framework and Timing Constraints of Early Triassic Nanzhang-Yuan'an Fauna
An Zhihui
Fang Zichen
Yan Chunbo
Li Jiangli
Liu Qiling
Zou Yarui
Chen Gang
Cheng Long
Abstract：The main marine reptiles spread over the eastern Paleotethys and western Panthalassa Ocean during the biotic recovery in the Early Triassic.The Nanzhang-Yuan'an fauna is one of the earliest marine reptiles in the Early Triassic.However,the specific survival time of this fauna and the fossil-bearing Jialingjiang Formation is still not well defined.Here,it conducted litho-stratigraphy and isotopic dating on the Nanzhang-Yuan'an fauna in the Nanzhang-Yuan'an area of Hubei Province.The fauna is documented in the laminated limestone of the upper Jialingjiang Formation,with a SHRIMP Ⅱ U-Pb age of 247.8±1.2 Ma.The stratigraphic framework for the upper part of the Jialingjiang Formation was established,proving that the Nanzhang-Yuan'an fauna lived in the late Spathian stage of the Early Triassic.
Keywords：Early TriassicNanzhang-Yuan'an faunamarine reptileSHRIMP Ⅱstratigraphic correlationgeobiology
Publication Date：2025-07-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 2584-2592 )