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首页> 外文期刊>Annales de Paleontologie >Trilobite fauna of basal Cambrian Series 3 (Stage 5) from the Parahio Valley (Spiti), Northwest Himalaya, India and its biostratigraphic significance
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Trilobite fauna of basal Cambrian Series 3 (Stage 5) from the Parahio Valley (Spiti), Northwest Himalaya, India and its biostratigraphic significance

机译：印度西北喜马拉雅山帕拉西奥河谷（Spiti）的寒武纪基底系列3（5期）的三叶虫动物区系及其生物地层意义

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摘要

We precisely demarcate the Hayden level 2 in the Kunzam La (Parahio) Formation, exposed on a steep hill on the left bank of the Parahio River in Spiti (India), which brackets the (local) stratigraphic range of Oryctocephalus indicus, a key taxon for establishing the base of the Cambrian Series 3 (Stage 5) and perhaps the Cambrian Series 2-Series 3 boundary interval globally. The FAD and LAD of O. indicus are observed at 7.74 and 14.61 m respectively, indicating 6.87 m stratigraphic range of the taxon along the Parahio valley section. The O. indicus Zone is demarcated with precise stratigraphic range of the eponymous species. The FADs of Pagetia and Kunmingaspis together at 7.34 m predate the FAD of O. indicus 7.74 m. Pagetia ranges from the Cambrian Series 2 (Stage 4) to the Cambrian Series 3 (Stage 5) and its occurrence is consistent with the global occurrences. Eosoptychoparia (Danzhaina) sp. is recorded for the first time from the Indian Himalaya. The base of the Cambrian Series 3 is considered to be placed at the FAD of the O. indicus. (C) 2016 Published by Elsevier Masson SAS.
机译：我们精确地在印度Spiti的Parahio河左岸的陡峭山丘上暴露的Kunzam La（Parahio）组中的Hayden 2层划界，该岩层包围了主要分类群Oryctocephalus indicus的（当地）地层范围。在全球范围内建立寒武纪3系列（第5阶段）以及寒武纪2系列3边界区间的基础。 O. indicus的FAD和LAD分别在7.74和14.61 m处观察到，表明沿Parahio谷段的分类单元地层范围为6.87 m。 O. indicus Zone划定了同种物种的精确地层范围。 Pagetia和Kunmingaspis的FAD一起位于7.34 m之前，而O. indicus的FAD则为7.74 m。 Pagetia的范围从寒武纪2系列（第4阶段）到寒武纪3系列（第5阶段），其发生与整体发生一致。嗜酸胆小球菌（Danzhaina）sp。首次从印度喜马拉雅山录制。寒武纪系列3的底部被认为是放置在印度洋的FAD上。 （C）2016由Elsevier Masson SAS发布。

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