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Yasuda Tephra Higashimoto, 1985

• Tephra
• Pleistocene

• Lithofacies: Vitreous volcanic ash

• Host: Saijo Formation
• Thickness: 40 - 60 cm

• Distribution: Otada - Munechikayanakuni - Ichigahara - Onchi, Higashihiroshima city, Hiroshima pref.

• Takagi and Mizuno (1999) Geology of the Kaitaichi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 49p. (in Japanese with English abstract 4p.)
• Higashimoto et al. (1985) Geology of the Kure District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 93p. (in Japanese with English abstract 6p.)