Himalayan Cambrian brachiopods

A synoptic analysis of previously published material and new finds reveals that Himalayan Cambrian brachiopods can be referred to 18 genera, of which 17 are considered herein. These contain 20 taxa assigned to species, of which five are new: Eohadrotreta haydeni, Aphelotreta khemangarensis, Hadrotreta timchristiorum, Prototreta? sumnaensis and Amictocracens? brocki. Well-preserved topotype material from the classic Parahio Valley section is described for three species that have not previously been illustrated photographically. A biostratigraphical scheme based on Cambrian brachiopod occurrence is integrated with that recently proposed for trilobites. Regional correlations based on shared taxa within and across Himalayan lithotectonic belts demonstrate that erosion of Cambrian rocks in the Kurgiakh orogeny in the Parahio Valley removed little of the Parahio Formation and that all of the fossil-bearing lithotectonic zones share similar late early Cambrian brachiopods, suggesting regional ...基于已发表资料与新发现标本的概要分析，本研究发现喜马拉雅寒武纪腕足动物（brachiopods）可归为18个属，其中17个属在本文中予以讨论。该18个属包含20个物种级分类单元，其中5个为新种：Eohadrotreta haydeni、Aphelotreta khemangarensis、Hadrotreta timchristiorum、Prototreta? sumnaensis以及Amictocracens? brocki。针对此前未通过摄影方式配图的3个物种，本文对采自经典帕拉希奥谷剖面的保存完好的地模标本（topotype material）进行了详细描述。本研究构建的基于寒武纪腕足动物产出特征的生物地层学方案，与近期针对三叶虫提出的相关生物地层学方案实现了整合。基于喜马拉雅岩石构造带内部及跨带共有分类单元的区域对比结果显示：帕拉希奥谷内库尔吉阿克造山运动对寒武纪岩石的侵蚀几乎未对帕拉希奥组（Parahio Formation）造成剥蚀；所有含化石岩石构造带均发育相似的寒武纪早世晚期腕足动物类群，这暗示区域……