Citation: | An Zhihui, Fang Zichen, Yan Chunbo, Li Jiangli, Liu Qiling, Zou Yarui, Chen Gang, Cheng Long, 2025. Stratigraphic Framework and Timing Constraints of Early Triassic Nanzhang-Yuan'an Fauna. Earth Science, 50(7): 2584-2592. doi: 10.3799/dqkx.2025.038 |
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.
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