Planktonic foraminiferal and diatom biostratigraphy of the upper part of the Miocene Ichishi Group in Mie Prefecture, central Honshu, Japan

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  • Oshida Hikoma
    Graduate School of Education, Aichi University of Education Aichi Prefectural Kaisho Senior High School
  • Hayashi Hiroki
    Institute of Environmental Systems Science, Academic Assembly, Shimane University
  • Yanagisawa Yukio
    Research Institute of Geology and Geoinformation, Geological Survey of Japan, AIST
  • Kurihara Yukito
    Faculty of Education, Mie University
  • Hoshi Hiroyuki
    Aichi University of Education

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  • 三重県に分布する中新統一志層群上部の浮遊性有孔虫・珪藻化石層序
  • ミエケン ニ ブンプ スル チュウ シン トウイツ シソウグン ジョウブ ノ フユウセイユウコウチュウ ・ ケイソウ カセキソウ ジョ

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Abstract

<p>We present new biostratigraphic data from an exposed Miocene sedimentary section of the upper part of the Ichishi Group in Mie Prefecture, central Honshu. Mudstone samples were collected from outcrop exposures, mainly found along a river, where we mapped lithologies and structures. Planktonic foraminiferal assemblages consisting mainly of warm water species were obtained from 21 samples above and below the lithostratigraphic boundary between the Mitsugano Member (upper part of the Oi Formation) and the overlying Chaya Member (lower part of the Katada Formation). The sedimentary sequence is correlated to zones N.7 and N.8 of the planktonic foraminiferal zonal scheme. Importantly, our results from high-resolution sampling show that the N.7/N.8 zonal boundary is located within a horizon ~19 m below the Oi/Katada formation boundary. Diatom fossils of the Crucidenticula sawamurae Zone (NPD2B; 18.1-17.0 Ma) were found in calcareous concretions within the Mitsugano Member below the N.7/N.8 zonal boundary. Our results suggest that the section is a suitable candidate for assessing the validity of early-middle Miocene planktonic foraminiferal biochronology.</p>

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