Abstract
The authors re-examined the Green Tuff stratigraphy in the Nozoki district, northen margin of Shinjo Basin, Yamagata Prefecture, Northeast Japan. The Nozoki district is the famous type locality of the lower Green Tuff in Dewa Mountains.The results are as follows;1) The Tertiary sediments of the studied area are newly divided into five lithostratigraphic units. In ascending order they are the Okatigawa Formation (the lowest Daijima-Nishikurosawa Stage), the Hatamura Formation (the lower Daijima-Nishikurosawa Stage), the Shunezaka Formation (the middle Daijima-Nishikurosawa Stage), the Kagamisawa Formation (the upper Daijima-Nishikurosawa Stage), and the Kusanagi Formation (the Onnagawa Stage).2) The Nozoki Formation, which has been considered to be a marine deposit at the Nishioga Stage, is completely replaced by the Okatigawa Formation which is correlated to the Daijima-Nishikurosawa Stage.3) The Shunezaka Formation contains the planktonic foraminifera of BLOW's N 9, and the Kagamisawa Formation contains the planktonic foraminifera of BLOW's N 10 and the nannofossils of OKADA & BUKRY's CN 5a.
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