本邦新生界最上部における石灰質ナンノプランクトン化石の分布について

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The present investigation is to analyze the floral changes of the calcareous nannoplankton population, using both light microscopy and electron microscopy, of the youngest Cenozoic formations of Japan and also to relate nannofossil biostratigraphy to the faunal change of some planktonic foraminiferal species and paleomagnetic stratigraphy. On the basis of local calcareous nannoplankton floral sequences and some planktonic foraminiferal species ascertained in the Lamont Core V21-98, eight calcareous nannoplankton zones are proposed for the Japanese youngest Cenozoic formations as follows in ascending order. Reticulofenestra Pseudoumbilica Zone: interval below the first occurrence of Pseudoemiliania lacunosa. Sphenolithus abies Zone; interval from the first occurrence of Pseudoemiliania lacunosa to the last occurrence of Sphenolithus abies. Discoaster brouweri brouweri Zone; interval from the last occurrence of Sphenollthus abies to the first occurrence of Gephyrocapsa oceanica. Discoaster brouweri trithallus Zone; interval from the first occurrence of Gephyrocapsa oceanica to the last occurrence of discoasters. Pseudoemiliania lacunosa Zone; interval from the last occurrence of discoasters to the last occurrence of Pseudoemiliania lacunosa. Gephyrocapsa oceanica Zone; interval from the last occurrence of Pseudoemiliania lacunosa to the first occurrence of Umbellosphaera irregularis. Umbellosphaera irregularis Zone; interval from the first occurrence of Umbellosphaera irregularis to the first occurrence of Emiliania huxleyi. Emiliania huxleyi Zone; interval above the first occurrence of Emiliania huxleyi. A summary of the calcareous nannoplankton correlation between the Japanese youngest Cenozoic formations, the Lamont Core V21-98 and the stratotype at le Castella and Santa Maria di Catanzaro, Southern Italy is given in Fig. 11. The "Pliocene-Pleistocene" boundary suggested by Ericson et al (1963) in the deep sea sediments and that at the stratotype are considered to be not so different; it seems that the "Pliocene-Pleistocene" boundary of Ericson et al (op. cit.) corresponds to the boundary between the Pliocene superiore and the Calabriano of le Castella section, Southern Italy, The same horizon may be correspond to the base of the Kurotaki Formation of the middle part of the Kiwada Formation in the Southern Kwanto region, the base of the Hijikata Formation in the Shizuoka region, and the basal part of the Wakimoto Formation in the Oga Peninsula in terms of the calcareous nannoplankton zones.
日本地質学会の論文
1973-03-31

本邦新生界最上部における石灰質ナンノプランクトン化石の分布について

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