Trilobites of Thailand's Cambrian–Ordovician Tarutao Group and their geological setting
Trilobites of Thailand's Cambrian–Ordovician Tarutao Group and their geological setting
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DOI：
10.1002/spp2.1516
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发表时间：
2023-09
影响因子：
2.3
通讯作者：
S. Wernette;N. Hughes;P. Myrow;A. Sardsud
中科院分区：
文献类型：
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作者：
S. Wernette;N. Hughes;P. Myrow;A. Sardsud
泰国最南端的萨敦省科塔鲁陶岛上含凝灰岩的上寒武统至奥陶系最低的地层中，含有丰富的三叶虫动物群，与全球生物地层学、冈德瓦周古地理和演化模式的转变有关。斯布玛苏地体为下古生界冈底瓦地体，与澳大利亚、北中国(中国-朝鲜)等来自超大陆赤道北部的大陆碎片密切相关，包括当时的南中国。共享的动物群也表明哈萨克斯坦人和劳伦斯人之间存在联系。从8个剖面采集到10个新发现种和1个新属，它们来自古滨海和陆架硅质碎屑沉积。根据已知的新分类群和新的分类群的修订，我们确定了塔鲁陶群上两个组的时代至寒武纪10期中期，以及中下部的特雷马多期。为西布马苏建立了两个生物区：Eosaukia buravasi区，包括从Ko Taruao开始的寒武纪的所有部分，以及Asspellus charoenmiti区，包括这里讨论的Tremadocian动物群。新属为Tarutaoia，新种为Tsinania sirindhornae，Partiokoldiniodia maneekuti，Pagodia？Uhleini、小甲藻、塔鲁陶亚、塔罗瓦、卡纳亚、波纹亚、纽卡尼亚和穿孔亚科比尼亚。其他在塔鲁桃首次报道的分类群是曼苏亚属吗？Sp.，Parakoldiniodia callosa Qian，Pseudagnostus sp.，Homagnostus sp.，Haniwa mucronata SherGold，Haniwa sosanensis？Kobayashi，Limhengia Single ex SherGold，Pacootasaukia sp.，Wu huia？Sp.、Plethopelella sp.、Apatokephalus sp.、Akoldinioidea sp.1和小卷蛾Koldinioadia sp.
Tuff‐bearing upper Cambrian to lowermost Ordovician strata on Ko Tarutao island, Satun province, southernmost peninsular Thailand, contain a rich trilobite fauna relevant to global biostratigraphy, peri‐Gondwanan palaeogeography and shifting evolutionary mode. This area of Sibumasu, a lower Palaeozoic marginal Gondwanan terrane, is shown to have been closely associated with Australia, North China (Sino‐Korea) and other continental fragments from the supercontinent's northern equatorial sector, including South China at that time. Shared faunas also suggest a Kazakhstani and Laurentian association. Collections from eight sections yielded 10 newly discovered species and one new genus from ancient shoreface and inner shelf siliciclastic deposits. With the new taxa and revision of taxa known previously, we refine the age of the upper two formations of the Tarutao Group to the middle of Cambrian Stage 10, and lower–middle Tremadocian. Two biozones are erected for Sibumasu: the Eosaukia buravasi Zone, encompassing all Cambrian sections from Ko Tarutao, and the Asaphellus charoenmiti Zone, encompassing the Tremadocian fauna discussed herein. The new genus is Tarutaoia and new species are Tsinania sirindhornae, Pseudokoldinioidia maneekuti, Pagodia? uhleini, Asaphellus charoenmiti, Tarutaoia techawani, Jiia talowaois, Caznaia imsamuti, Anderssonella undulata, Lophosaukia nuchanongi and Corbinia perforata. Other taxa reported for the first time from Tarutao are Mansuyia? sp., Parakoldinioidia callosa Qian, Pseudagnostus sp., Homagnostus sp., Haniwa mucronata Shergold, Haniwa sosanensis? Kobayashi, Lichengia simplex Shergold, Pacootasaukia sp., Wuhuia? sp., Plethopeltella sp., Apatokephalus sp., Akoldinioidia sp. 1 and Koldinioidia sp.