Carnian (Late Triassic) conodont faunas from south-western China and their implications
Carnian (Late Triassic) conodont faunas from south-western China and their implications
复制标题
中国西南部卡尼期（晚三叠世）牙形刺动物群及其意义
DOI：
10.1002/spp2.1116
复制
发表时间：
2018
影响因子：
2.3
通讯作者：
Wignall Paul B.
中科院分区：
文献类型：
--
作者：
Zhang Zaitian;Sun Yadong;Lai Xulong;Wignall Paul B.
牙形刺是超区域关联的重要指标化石，特别是在三叠纪。然而，早期卡尼期牙形刺在华南地区却鲜为人知。本研究对云南省和贵州省的三个剖面进行了牙形刺生物地层学和分类学研究。已鉴定2属23种，其中4个新种：Quadralella (Q.) posticasp。十一月，Q。 鲁棒性。十一月，Q。 威纳尔利斯普。十一月和Q。 永宁草十一月已识别出五个牙形刺区。按升序排列，它们是 Paragondolella foliataZone、Q. PolygnathiformisZone，Q. praelindaeZone、Q.aff.auriformisZone 和 Q.aff.auriformisZone 罗布斯塔区。朱干坡组上部（儒略1）的牙形刺具有相当丰富的多样性和丰富性，但瓦窑组（儒略2及以下）的物种丰富度和多样性急剧下降。这种变化很可能是卡尼期湿润期气候变暖和海洋缺氧引起的。
Conodonts are important index fossils for supra‐regional correlation especially in the Triassic. However, early Carnian conodonts are comparatively poorly known in South China. In this study, conodont biostratigraphy and taxonomy are investigated at three sections in the provinces of Yunnan and Guizhou. Two genera and 23 species are identified, including 4 new species:Quadralella (Q.) posticasp. nov.,Q. robustasp. nov.,Q. wignallisp. nov. andQ. yongningensissp. nov. Five conodont zones are recognized. They are, in ascending order, theParagondolella foliataZone,Q. polygnathiformisZone,Q. praelindaeZone,Q.aff.auriformisZone andQ. robustaZone. Conodonts are reasonably diverse and abundant in the upper Zhuganpo Formation (Julian 1) but decrease sharply in both species richness and diversity towards the Wayao Formation (Julian 2 and younger). It is most likely that this change was caused by climate warming and marine anoxia during the Carnian Humid Episode.