第一瀬戸内区中新統(師崎, 岩村, 富草層群)の珪藻示準化石と地質年代

第一瀬戸内区中新統(師崎, 岩村, 富草層群)の珪藻示準化石と地質年代
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濑户内第一区中新世(庄崎群、岩村群、富草群)的硅藻指数化石和地质时代

DOI:
10.5575/geosoc.105.152
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发表时间:
1999
期刊:
Journal of the Geological Society of Japan
影响因子:
--
通讯作者:
雅夫 岩井
雅夫 岩井
中科院分区:
--
文献类型:
--
作者:
知佳 伊藤;俊明 入月;雅夫 岩井

文献摘要

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在诸崎组(丰滨组、山美组和内海组)、岩村组(富山组)和富草组(阿瓦诺组和米川组)的样品中鉴定出硅藻分区关键种。这些组合的特点是丰富的Kisseleviella carina和Stephanopyxis spp。本文报道了泽村十字壳(Crucidenticula sawamurae)、泽村十字壳(C. ikebei、龟野翠雀(Delphineis kamenooensis)和D. miocenica,而没有Crucidenticula kanayae,表明上述类群的样品均位于C.早中新世晚期。
Diatom zonal key species are identified in the samples from the Morozaki (the Toyohama, Yamami and Utsumi Formations), Iwamura (the Toyama Formation) and Tomikusa (the Awano and Yonekawa Formations) Groups. These assemblages are characterized by the abundant occurrences of Kisseleviella carina and Stephanopyxis spp. The presence of Crucidenticula sawamurae, C. ikebei, Delphineis kamenooensis and D. miocenica, and the absence of Crucidenticula kanayae suggest that all of those samples from above groups are placed within the middle to upper part of C. sawamurae Zone (late Early Miocene).