Classification, evolution, and paleoecology of the Permian to Triassic conodonts based on a natural assemblage

基于自然组合的二叠纪至三叠纪牙形刺的分类、演化和古生态学

• 批准号: 21740368
• 负责人: AGEMATSU Sachiko
• 金额: $ 2.58万
• 依托单位: University of Tsukuba
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21740368/
• 关键词: コノドント; 三畳紀; 自然集合体; 生層序; 分類; ペルム紀

Natural assemblages of Hindeodus parvus and Hindeodus typicalis, the earlymost Induan (Early Triassic) conodonts, were recovered from the black claystone beds distributed in the Funabuseyama area, Gifu Prefecture. I reconstructed the skeletal architecture of these species with 13 elements. It was found from the result of this study that these conodonts dwelt near a deep sea floor and were buried directly in the sediments after their death. Conodont-accumulated layers in the siliceous claystone beds distributed in the Akiyamagawa area, Tochigi Prefecture, were also investigated in this study. The layer bears the Olenekian (Early Triassic) conodont species. On the basis of the conodont paleoecology and lithology, it was concluded that an anoxic condition was often produced in a pelagic deep sea or pelagic intermediate water.

印度古德斯帕尔维斯和典型的印度教徒的天然组合是最早的印度（早期三叠纪）牙形，从分布在gifu县的funabuseyama地区的黑色粘土床中回收。我用13个元素重建了这些物种的骨骼结构。从这项研究的结果中发现，这些牙能居住在深海地板附近，并在死后直接埋在沉积物中。在这项研究中，还研究了分布在Akiyamagawa地区Tochigi县的硅质粘土床中的牙能蓄积层。该层带有Olenekian（早期的三叠纪）牙形特物种。根据牙形神学和岩性学，得出结论，通常在上层深海或上层中间水中产生缺氧条件。