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Yokigaoka I Tephra Kobiwako Research Group, 1977

• Tephra
• Pleistocene

• Lithofacies: Volcanic ash

• Thickness: 2 cm
• Host: Hino Clays Member, Yokigaoka Clays Member

• Distribution: Kasuga, Minakuchi, Koka city, Shiga pref.; Yokigaoka, Hino town, Gamo county, Shiga pref.

• 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.)
• Ishida et al. (1984) Geology of the Hikone-Seibu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 121p. (in Japanese with English abstract 6p.)