房総半島とカラブリア半島における更新統の下限について

概要

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Since Emiliani et al. (1961) analysed the paleotemperature of the Pliocene and Pleistocene in le Castella area, southern Italy, the proposed type locality of the boundary between the Pliocene and Pleistocene, more-detailed works had begun on the stratigraphic problems of the Upper Pliocene and Lower Pleistocene in various-areas of the world. Among the recent knowledge, the combined microbiostratigraphy and magnetic chronology is the most useful criteria for the Pliocene and Pleistocene correlation. The authors undertook a tentative correlation of the Upper Pliocene and Lower Pleistocene between le Castella area and the Boso Peninsula (Fig. 2) based on their previous studies of the magnetic stratigraphy made on both areas (Nakagawa, Niitsuma, and Hayasaka, 1969; Nakagawa, Niitsuma, and Elmi, 1970). The base of the Calabrian in le Castella area could be placed at a horizon younger than the Olduvai Event in the Matuyama Reversed Polarity Epoch in the magnetic stratigraphy in the sense of Hays et al. (1969). Designation of the type locality of the Pliocene-Pleistocene boundary and the microbiostratigraphic evidence of the horizon around the boundary were previously reviewed briefly.
日本第四紀学会の論文