该研究组报道了一个保存异常完好的早三叠世化石组合,贵阳生物群,来自中国南部贵阳附近的大业组。高精度铀铅测年结果表明,贵阳生物群的年龄为2500.83±0.07/ -0.06万年。这距离严重的二叠纪-三叠纪大灭绝只有108±0.08万年，因此这个组合是已知最古老的中生代最古老的物种。
到目前为止，贵阳生物群至少包括12纲19目，包括丰富的鱼类区系和蛙类，揭示了一个营养复杂的海洋生态系统。因此，这一组合表明了二叠纪-三叠纪大灭绝后现代海洋生态系统的迅速崛起。
据悉，保存完好的化石组合(lagerstatten)为深入研究远古时期的进化创新提供了关键的见解。
附：英文原文
Title: A Mesozoic fossil lagersttte from 250.8 million years ago shows a modern-type marine ecosystem
Author: Xu Dai, Joshua H. F. L. Davies, Zhiwei Yuan, Arnaud Brayard, Maria Ovtcharova, Guanghui Xu, Xiaokang Liu, Christopher P. A. Smith, Carrie E. Schweitzer, Mingtao Li, Morgann G. Perrot, Shouyi Jiang, Luyi Miao, Yiran Cao, Jia Yan, Ruoyu Bai, Fengyu Wang, Wei Guo, Huyue Song, Li Tian, Jacopo Dal Corso, Yuting Liu, Daoliang Chu, Haijun Song
Issue&Volume: 2023-02-10
Abstract: Finely preserved fossil assemblages (lagerstatten) provide crucial insights into evolutionary innovations in deep time. We report an exceptionally preserved Early Triassic fossil assemblage, the Guiyang Biota, from the Daye Formation near Guiyang, South China. High-precision uranium-lead dating shows that the age of the Guiyang Biota is 250.83 +0.07/–0.06 million years ago. This is only 1.08 ± 0.08 million years after the severe Permian-Triassic mass extinction, and this assemblage therefore represents the oldest known Mesozoic lagerstatten found so far. The Guiyang Biota comprises at least 12 classes and 19 orders, including diverse fish fauna and malacostracans, revealing a trophically complex marine ecosystem. Therefore, this assemblage demonstrates the rapid rise of modern-type marine ecosystems after the Permian-Triassic mass extinction.
DOI: adf1622
Source: https://www.science.org/doi/10.1126/science.adf1622