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정은경,김경식,Mitsuo Suzuki,Kazuhiko Uemura 한국지질과학협의회 2012 Geosciences Journal Vol.16 No.2
The paleofloral change from the Aniai-type to the Daijima-type during the Miocene is the most distinctive and representative one of the six floral changes in the Japanese Archipelago during the Tertiary. These floral types are based mainly on compressed or imprinted leaf fossils. In Korea, the transition-type between the Aniai- and Daijima-type floras has been proposed based on the fossil wood assemblages, and the Hatamura Formation, which is the same age as the Daijima Formation, has yielded abundant fossil woods. To confirm whether the fossil wood assemblages are in agreement with the paleofloras inferred from fossil leaves, the fossil woods from the Hatamura Formation were studied. We found that warm temperate and daijiman elements, such as Keteleeria, Taxodioxylon cunninghamioides, T. sequoianum and Pinus, were present in the Hatamura Formation. Therefore, it can be concluded that the fossil wood types from the Hatamura Formation agree well with the Daijima-type Flora. This result, in turn, verifies the existence of transitional flora between the Aniai- and Daijima-types in Northeastern Asia