網走川下流低地の沖積層とその^<14>C年代

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  • Holocene Deposits in Abashiri River lowland, Northeastern Hokkaido

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説明

The purpose of this paper is to recognize the sedimental structure of the HOlocene deposits in Abashiri river lowland. The author obtained some machine boring cores and several drilled samples from the surface to use them for the AMS dating. Holocene deposits are classified into five parts as the basial gravel(BG), lower sand(LS), middle mud(MM), upper sand(US) and the top peat/mud(TP/TM). The ^<14>C date from the bottom of the peat layer of the lacustrine terrace I is ca. 5080±310B.P. and the altitude of it is between +0.04〜1.44m. This suggests that the culmilation of the postglacial transgression of this area might be ca 5,000B.P.

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