島根大学総合理工学部地球資源環境学教室
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島根大学地球資源環境学研究報告 13
1994-11-30 発行
斐伊川河口ボーリングHB1の花粉分析結果の再検討
Reexamination of the pollen analysis of HB 1 core at the mouth of River Hii, Shimane Prefecture, Japan
大西 郁夫
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内容記述（抄録等）
The results of pollen analyses of HB1（Onishi，1980）are reexamined．
As there are some pollen grains of Carya，Liquidambar and Keteleeria，the lower parts of this core（33.8-34.6 meters in depth）may belong to the Miocene．
As there are Lagerstroemia pollen grains，the middle parts（21.0-32.7 meters in depth）are
correlated with the upper Pleistocene Yumigahama Formation（Onishi，1977）．
The upper parts of the core（0.0−20.2 meters in depth）may be correlated with the Holocene Nakaumi Formation．The lower half of this formation is correlated with the Ulmus-Zelkova subzone of Pinus-Abies pollen zone to the Cyclobalanopsis-Quercus subzone of Gramineae pollen zone．Sedimentation rate of this part is estimated to be 1.68mm／y．The upper half is correlated with the Pinus subzone of Gramineae pollen zone．
As there are some pollen grains of Carya，Liquidambar and Keteleeria，the lower parts of this core（33.8-34.6 meters in depth）may belong to the Miocene．
As there are Lagerstroemia pollen grains，the middle parts（21.0-32.7 meters in depth）are
correlated with the upper Pleistocene Yumigahama Formation（Onishi，1977）．
The upper parts of the core（0.0−20.2 meters in depth）may be correlated with the Holocene Nakaumi Formation．The lower half of this formation is correlated with the Ulmus-Zelkova subzone of Pinus-Abies pollen zone to the Cyclobalanopsis-Quercus subzone of Gramineae pollen zone．Sedimentation rate of this part is estimated to be 1.68mm／y．The upper half is correlated with the Pinus subzone of Gramineae pollen zone．
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