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田中 宏之, 中島 啓治, 金子 稔, 吉田 武雄 地球科学 37 (6), 349-360c, 1983
The Usui Pass area is mainly composed of pyroclastic rocks and marine sedimentary rocks of Neogene system. The writers have carried out diatom and radiolarian analysis on marine sediments from the …
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