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.对中国南方贵州省古交地区大冶组下部层位开展逐层系统采样，获取了全新的格里斯巴赫期-迪纳尔期（印度阶，早三叠世）菊石动物群，该动物群展现出一套区域尺度的印度阶菊石演化序列。本研究建立的生物地层格架按时序依次包含晚格里斯巴赫期的中型蛇菊石（Ophiceras medium）层位与贵州尖山菊石（Jieshaniceras guizhouense）层位，以及中迪纳尔期的辐形安姆菊石（Ambites radiatus）层位。其中，辐形安姆菊石层位在华南地区首次被确立为独立生物带。本次研究共鉴定出8属13种菊石，包括1个新种：穆勒菊石（Mullericeras gujiaoense n. sp.）。新数据显示，二叠纪-三叠纪生物大灭绝事件后，菊石分类多样性在晚格里斯巴赫期便快速达到相对较高的水平，这与北印度洋盆等其他盆地的相关观测结果相呼应。