ibclogo XVI International Botanical Congess


Abstract Number: 4849
Poster No. = 968


MIDDLE MIOCENE PERMINERALIZED PLANTS FROM HOKKAIDO, JAPAN


Midori Matsumoto, Akiko Furuya and Harufumi Nishida, Chiba University, Dept. Earch Science, 1-33 Yayoi-cho, Inage-ku Chiba, Japan 263-8522


The M-Miocene Mosanru Formation (12Ma) in northern Japan, contains silicified plant remains. The Formation composed of volcanic and sedimentary rocks intercalated with silicified layers. ü@ü@Anatomically preserved plants are found from two units:the lower contains in situ petrified woods, the upper contains plant parts. The upper unit consists of cyclic accumulation of fossiliferous deposits. Well-preserved plant remains were collected only from one bed. Suggest a depositional condition related tolacustrine environment similar to that of the Eocene Princeton Chert. Nine genera have been identified, including four new species:Osmunda, Abies, Picea, Tsuga, Glyptostrobus, Alnus, Ostrya, Fagus, Decodon. This flora provides rare evidence for taxonomical, phylogenetical and phytogeographical understanding of some plants in Northern Hemisphere.


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