Data from: A new Griesbachian-Dienerian (Induan, Early Triassic) ammonoid fauna from Gujiao, South China

Bed-by-bed sampling of the lower portion of the Daye Formation at Gujiao, Guizhou Province, South China, yielded new Griesbachian–Dienerian (Induan, Early Triassic) ammonoid faunas showing a new regional Induan ammonoid succession. This biostratigraphic scheme includes in chronological order the late Griesbachian Ophiceras medium and Jieshaniceras guizhouense beds, and the middle Dienerian Ambites radiatus bed. The latter is recognized for the first time as a separate biozone in South China. Eight genera and 13 species are identified, including one new species, Mullericeras gujiaoense n. sp. The new data show that a relatively high level of ammonoid taxonomic richness occurred rather rapidly after the Permian/Triassic mass extinction in the late Griesbachian, echoing similar observations in other basins, such as in the Northern Indian Margin.

对中国南方贵州省姑寨（Gujiao）地区大冶组下部开展的逐层采样（bed-by-bed sampling）工作，产出了全新的格里斯巴赫期（Griesbachian）-迪纳尔期（Dienerian），对应印度期（Induan）、早三叠世（Early Triassic）的菊石动物群（ammonoid faunas），揭示了一套区域内全新的印度期菊石地层序列。该生物地层方案（biostratigraphic scheme）按时间顺序依次收录晚格里斯巴赫期的中型蛇菊石（*Ophiceras medium*）层与贵州介壳菊石（*Jieshaniceras guizhouense*）层，以及中迪纳尔期的辐形安比菊石（*Ambites radiatus*）层。其中该中迪纳尔期床层在华南地区首次被确立为独立的生物带（biozone）。本次研究共鉴定出8个属、13个种，其中包含1个新种：姑寨穆勒菊石（*Mullericeras gujiaoense* n. sp.）。新数据显示，在二叠纪-三叠纪大灭绝事件（Permian/Triassic mass extinction）后的格里斯巴赫期晚期，菊石类群的分类丰富度已快速达到相对较高的水平，这一发现与北印度洋缘等其他盆地的同类观测结果高度吻合。