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Otaru Formation

• Type locality: Otaru city, Hokkaido
• Volcanic rocks
• late Miocene (12.6, 9.0, 6.6 Ma, K-Ar)
• Correlation: Oshoro Formation, Katsunaigawa Formation, Onenai Formation

• Sedimentary facies: Marine
• Lithofacies: Pigeonite series
• Lithofacies: Pyroxene basalt, Basaltic andesite, Andesite
• Lithofacies: Hyaloclastite, Pillow lava, Scoriaceous tuff, Tuffaceous sandstone, Rhyolitic tuff

• Distribution: Oshoro bay - Cape Kabuto, Otaru city, Hokkaido

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