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Jokoku I Tephra Kobiwako Research Group, 1981

• Tephra
• Pliocene - Pleistocene

• Lithofacies: Volcanic ash

• Thickness: 10 - 60 cm
• Host: Nango Gravels and Clays Member

• Distribution: Otogawa river, Ishizue, Otsu city, Shiga pref.; Kiryu town, Otsu city, Shiga pref.; Sato - Higashitera, Konan city, Shiga pref.

• Wakita et al. (2013) Geology of the Kyoto-Tonambu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 124p. (in Japanese with English abstract 3p.)
• Nakano et al. (2003) Geology of the Minakuchi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 83p. (in Japanese with English abstract 3p.)