木材化石群集にもとづく先史時代の森林植生の復元〔英文〕 ("陸の古環境復元"特集号)

概要

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To clarify processes relevant to the formation and deposition of fossil wood assemblages, depositional pattern of fossil woods within a peat bed was studied at the Nakazato Site and the Fukuro-Teichi Site in eastern Tokyo. From the distribution of individual specimens, two different types of fossil wood assemblage have been recognized: one is a buried forest which is discovered in situ, and another is a group of trees that have fallen down into a channel from riverside banks to be deposited there. At the Nakazato Site a Fraxinus-dominant buried forest of the Late to Latest Jomon Period was discovered, and a past community was reconstructed from the distribution of individual specimens. Within the same peat bed, habitat preference of taxa was deduced from difference in composition between blocks farther away from the terrace scarp and those nearer to it. At the same site, two other assemblages of the Kofun Period and Kodai were also detected, and their composition showed strong human impact upon vegetation. At the Fukuro-Teichi Site, the latter type of assemblage was unearthed in a channel of the Late Jomon Period, and its composition strongly reflected very local vegetation beside the channel. With the recognition of processes concerning the formation of fossil wood assemblages, one can estimate the extent of information obtainable from respective assemblages.
日本第四紀学会の論文