686. ADDITION TO THE MESOZOIC PLANTS FROM THE AKAIWA FORMATION (UPPER NEOCOMIAN), THE ITOSHIRO GROUP, CENTRAL HONSHU, INNER ZONE OF JAPAN

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  • 686. ネオコミアン上部赤岩層 (石徹白層群上部) の植物化石 (追加)

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This paper deals with the additional palaeobotanical descriptions of newly discriminated species to the Akaiwa flora formerly described by us (1976) in the present transactions. The newly described species are as follows ; Gleichenites nipponensis, Coniopteris saportana, Adiantopteris sewardii, A. toyoraensis, Raphaelia diamensis, Dictyozamites cfr. obliquus, Nilssonia schmidtii, Butefia? sp., Ginkgoites paradiantoides, Arctobaiera? sp., Elatocladus sp. C, E. sp. D, Protodammara sp. and Carpolithes sp. In addition, both Gleichenites porsildii and Cladophlebis ex gr. williamsonii are redescribed with some emendation and additional remarks respectively. It might be notable that Raphaelia diamensis, which has so far been regarded as a Jurassic species, is now found from the Japanese Lower Cretaceous. The occurrence of Coniopteris saportana, Dictyozamites cfr. obliquus, Nilssonia schmidtii, Ginkgoites paradiantoides and Protodammara sp., is the first record in Japan. After all, the Akaiwa flora is now consisting of 26 genera and 53 species. As formerly mentioned by us, both the Akaiwa flora (late Neocomian) and the underlying Oguchi flora (early Neocomian, the main part of the "Tetori flora") in the Inner Zone of Japan, are similar in composition to the coeval floras in VAKHRAMEEV'S Siberian Palaeofloristic Area, but are not so to those in the Outer Zone of Japan.

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