東北日本の外帯, 相馬中村層群栃窪層産後期ジュラ紀植物 I

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This paper deals with the systematic description of fossil plants from the Oxfordian Tochikubo Formation of the Somanakamura Group (Middle to Late Jurassic), which is mostly of marine origin and is distributed in the eastern part of Fukushima Prefecture, in the Outer Zone of Northeast Japan. We described 32 taxa consisting of 10 ferns, 10 bennettitaleans including 5 forms of Ptilophyllum, 7 cycadaleans, 1 unclassified cycadophyte, 3 conifers and 1 unclassified reproductive organ (seed). This plant-assemblage is characterized by the abundant occurrence of Zamites, Ptilophyllum and Nilssonia. While no ginkgoalean, czekanowskialean and Podozamites have been found. This plant-assemblage is obviously of the Ryoseki-type in floristic composition and holds important stratigraphic and phytogeographic position along the Circum Pacific regions.
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