Pollen assemblages and climatic implications of the Upper Miocene Tatsumitoge Member, Ningyotoge Formation, Tottori Prefecture, Japan

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  • SAITO Takeshi
    Department of Environmental Science and Technology, Faculty of Science and Technology, Meijo University
  • ICHITANI Toshihiro
    Ichitani Earth Environmental Laboratory

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  • 鳥取県人形峠層辰巳峠部層(上部中新統)の花粉群集と気候変動
  • トットリケン ニンギョウ トウゲソウ タツミ トウゲブソウ ジョウブ チュウシントウ ノ カフン グンシュウ ト キコウ ヘンドウ

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Abstract

The Upper Miocene Tatsumitoge Member of the Ningyotoge Formation, Tottori Prefecture, Japan, yields the well-known Tatsumitoge megafossil plant flora. Furthermore, pollen assemblages from the Tatsumitoge Member comprise 44 taxa mainly representative of broad-leaved deciduous trees such as Fagus, Ulmus-Zelkova, Carpinus and Alnus, and of conifers such as Picea, Pinus-Pseudolarix, Abies and Tsuga. The pollen assemblages correlate with NP-4 (6.5-4 Ma) of the standard Neogene pollen zones of Japan. The low percentage of Cathay a pollen further defines this zone as NP-4a (6.5-5.5 Ma) in the Messinian stage. Locally two pollen zones are recognized and this suggests that the Tatsumitoge flora should be divided into two parts: Zone I, the lower, being characterized by an abundance of Picea, Alnus and Ulmus-Zelkova, while in the upper Zone II Fagus is dominant. The defining features of these pollen zones can be best understood by considering the local palaeo-vegetation and palaeoclimate of the area during the Messinian stage. The percentages of Fagus and Picea show notable 5-cycle fluctuations which indicate small scale and short term (<〜4.1×10^4 yr.) climatic fluctuations between 6.5-5.5 Ma.

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