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Onenai Formation

• Volcanic rocks
• late Miocene (11.2 Ma, K-Ar)
• Correlation: Otaru Formation

• Sedimentary facies: Marine
• Lithofacies: Pyroxene andesite
• Lithofacies: Pyroclastic rocks
• Lithofacies: Hyaloclastite, Re-worked hyaloclastite, Tuff breccia

• Distribution: Yoichi city, Yoichi county, Hokkaido

• Okamura and Nagata (2007) Jour. Geol. Soc. Japan, vol.113, Supplement, pp.93-102 DOI