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Oki Tephra Machida and Arai, 1983

• Tephra
• Holocene (9,600 yBP, ¹⁴C)

• Lithofacies: Volcanic ash

• Thickness: ca. 10 cm
• Source: Ururun island (Korea)
• Host: Nanko Formation

• Distribution: Nankoohashi bridge, Nanko, Osaka city, Osaka pref.

• Huzita and Maeda (1985) Geology of the Osaka-Seinambu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 103p. (in Japanese with English abstract 5p.)