Geoscience reports of Shimane University

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Geoscience reports of Shimane University 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
Onishi, Ikuo
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Description
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.
NCID
AA11455176