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Yama Tephra Kobiwako Research Group, 1977

• Tephra
• Pliocene - Pleistocene

• Lithofacies: Volcanic ash

• Thickness: 50 - 100 cm
• Host: Yokigaoka Clays Member

• Distribution: Bessho - Yokigaoka, Hino city, Gamo county, Shiga pref.; Yama - Kasuga, Minakuchi town, Koka city, Shiga pref.; Yamada - Yamanaka, Tsuchiyama town, Koka city, 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.)