<国立科博専報>北海道西南部および本州北端部の台島型植物群(中新世)

概要

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Floral characteristics of late Early to early Middle Miocene Daijima-type floras in southwestern Hokkaido and in the northern part of Honshu are noted, comparing with contemporaneous floras from Sakhoalin to Central Honshu. The compostition and floral characters of the Fujikura and Takinoue floras are described on the basis of new materials. The Fujikura flora in Aomori Prefecture, Honshu, is more similar to the Utto flora in its composition than the Yoshioka flora, though both are close geographically. The Takinoue flora in the southern part of central Hokkaido has a common feature to other floras in southwestern Hokkaido. Except for the Abura flora, almost all the floras in Sakhalin and northern Japan are lowland-type floras. They show the latitudinal gradient in vegetation during the late Early to early Middle Miocene. The evergreen broad-leaved forest admixed with several oak-laurel elements in northern Honshu was replaced by the deciduous broad-leaved forest to the north. The lowlandtype floras in southwestern Hokkaido, together with the Takinoue flora in central Hokkaido, represent a transitional zone of both forests.
国立科学博物館の論文