Estimating sedimentary environment of a Pleistocene sediment in Kyotango City, Kyoto Prefecture, Japan, with the first report of <i>Pseudopodosira kosugii</i> from the Pleistocene series on the Japan Sea Coast

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  • Ohtsuka Taisuke
    Lake Biwa Museum
  • Shibazaki Miyoko
    Tansaibou-no-kai, “Hashikake” system in Lake Biwa Museum Department of Biology and Geosciences, Graduate School of Science, Osaka City University
  • Tomi Koyuki
    Tansaibou-no-kai, “Hashikake” system in Lake Biwa Museum
  • Kotaki Atsuo
    Graduate School of Life and Environmental Sciences, Kyoto Prefectural University
  • Takahara Hikaru
    Graduate School of Life and Environmental Sciences, Kyoto Prefectural University
  • Hayashi Ryoma
    Lake Biwa Museum
  • Yasuno Toshikatsu
    Fukui Senior High School attached to Fukui University of Technology

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Other Title
  • 京都府京丹後市の更新統の堆積環境の推定および日本海側更新統からの珪藻種<i>Pseudopodosira kosugii</i>の初産出
  • 京都府京丹後市の更新統の堆積環境の推定および日本海側更新統からの珪藻種Pseudopodosira kosugiiの初産出
  • キョウトフ キョウタンゴシ ノ コウシントウ ノ タイセキ カンキョウ ノ スイテイ オヨビ ニホンカイガワ コウシントウ カラ ノ ケイソウシュ Pseudopodosira kosugii ノ ハツ サンシュツ

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Abstract

<p>We conducted diatom analysis, pollen analysis, and radiocarbon dating of a black mud layer with an altitude of about 5m located in the coastal area of Kyotango City, Kyoto Prefecture, Japan. Radiocarbon age of the tree fossil in this layer was older than 43,500yBP. Pollen analysis reconstructed cool-temperate deciduous broad-leaved forests accompanied with Cryptomeria japonica and Pinus, but some pollen grains of evergreen Quercus subgenus Cyclobalanopsis were also detected. The fossil diatom assemblage, mainly composed of brackish species with the dominance of Pseudopodosira kosugii, suggests that the layer was deposited on a salt marsh around the high tide level of a river mouth mudflat. This is the first report of P. kosugii from the Pleistocene series of the Japan Sea Coast.</p>

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