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Okada Tephra Itoigawa, 1971

Invalid synonym: Nishidani Tephra

• Type locality: Okada elementary school, Chita city, Aichi prefecture
• Tephra
• Pleistocene

• Lithofacies: Vitreous volcanic ash
• Sedimentary structures: Graded bedding

• Host: Tokoname Formation

• Distribution: Okada elementary school, Chita city, Aichi pref.

• Yoshida and Ozaki (1986) Geology of the Handa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 98p. (in Japanese with English abstract 4p.)