東北日本の外帯, 牡鹿層群荻の浜層産後期ジュラ紀植物 I

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In this paper we describe the fossil plants belonging to 16 genera and 30 species (or forms) newly collected from the Oginohama Formation (Oxfordian-Tith-onian) of the Oshika Group, Northeast Japan, together with our revision of the previous works. Among these, three bennettitalean species are new to science. The fossil plant assemblage of the Oginohama Formation is obviously of the Ryoseki-type as well as those from the Tochikubo Formation (Oxfordian) of the Somanakamura Group, the Mone (Oxfordian) and Kogoshio (Kimmeridgian-Tithonian) Formations of the Shishiori Group, and the Lower Gretaceous plant-beds in the Outer Zone of Northeast and Southwest Japan. The present fossil plant assemblage is characterized by the dominance of varied Zamites and Ptilophyllum (bennettitaleans) and by the absence of ginkgoalens, czekanowskialeans and Podozamites.
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