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Tokutani Tephra Kobiwako Research Group, 1977
- Lithofacies: Volcanic ash
- Distribution: Nakayama, Hino city, 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.)