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Sonohara Tephra Takemura et al., 1984

• Type locality: Yamadagawa river, Sonohara, Hokusei town, Inabe city, Mie prefecture
• Tephra
• Pliocene

• Lithofacies: Volcanic ash
• Lithofacies (Basal): Pumice

• Host: Oizumi Formation
• Thickness: 30 cm
• Thickness (Basal): 3 cm

• Distribution: Yamadagawa river, Sonohara - Higashikoyamadanigawa river - Nishikoyamadanigawa river, Hokusei town, Inabe city, Mie pref.

• Yoshida et al. (1991) Geology of the Kuwana District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 154p. (in Japanese with English abstract 5p.)