861. EARLY JURASSIC PLANTS IN JAPAN. : PART 8. SUPPLEMENTARY DESCRIPTION AND CONCLUDING REMARKS

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  • 861. 日本のジュラ紀前期植物化石 : その 8(記載の追加および結論)
  • 日本のジュラ紀前期植物化石-8-(記載の追加および結論)〔英文〕
  • ニホン ノ ジュラキ ゼンキ ショクブツ カセキ 8 キサイ ノ ツイカ オヨ

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Abstract

This is the last (8th) of our serial papers. It deals with the supplementary description of newly obtained fossil plants and gives concluding remarks on the Early Jurassic plants in Japan. Based on the floristic composition, we recognized the Kuruma-type and Nishinakayama-type floras in late Early Jurassic time in Japan. The Nishinakayama-type flora is unique and exotic and there is no comparable flora in Eurasia. The Kuruma-type flora in Japan is similar in the floristic composition to coeval or nearly coeval floras in South China. In addition, we briefly reviewed Early Jurassic floras in Eurasia from a paleophytogeographical point of view. The taxa described in this paper are Gleichenites? sp. A, Phlebopteris sp. A, Dictyophyllum kotakiense Kimura et Tsujii, Sphenopteris sp. H, Ptilophyllum shinadaniense Kimura et Tsujii, P. sp. cf. P. hsiangshanense Wu, P. sp. A, Pterophyllum? sp., Pseudoctenis nipponica Kimura et Tsujii and Nilssonia sp. B from the Kuruma Group, and Sphenopteris sp. G, Otozamites sp. C and Pseudoctenis? sp. from the Nishinakayama Formation.

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