Pollen Assemblages from the Peat Just Below the Aso-4 at Keihoku, Wakkanai, Northern Hokkaido

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  • 北海道北部稚内市恵北における阿蘇４（Ａｓｏ‐４）直下の泥炭層から得られた花粉群
  • ホッカイドウ ホクブ ワッカナイシ ケイ ホク ニ オケル アソ4 Aso 4 チョッカ ノ デイタンソウ カラ エラレタ カフングン

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Abstract

The peat of the Pleistocene Keihoku Formation at Keihoku, northern Hokkaido, is covered by tephra which is correlated to Aso-4. Pollen assemblages just below the tephra are dominated by Picea, which coexisted with Larix, Abies, and Betula. These assemblages indicate a cold and dry climate, which corresponds to the pollen assemblages just below Aso-4 at other points in Hokkaido. Larix-rich pollen assemblages accompanied Cyperaceae and Thalictrum, whereas Larix-rare assemblages included abundant Lysichiton pollen and remarkable Sphagnum spores. This reflects local wetland conditions at Keihoku around the Aso-4 fall, such as larch forests growing on the sedge bog or with skunk cabbages on the sphagnum bog.

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