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Okkai Tephra

• Tephra
• Pleistocene - Holocene

• Lithofacies: Pumice
• Lithofacies (Minor): Volcanic sands, Volcanic ash

• Thickness: ca. 30 - 60 cm

• Distribution: Katashina river, Katashina city, Tone county, Tochigi pref.

• Kawata (1955) Nantaizan, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 43p. (in Japanese with English abstract 7p.)