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Tomarugawa Formation

• Volcanic rocks
• Pliocene

• Sedimentary facies: Marine
• Lithofacies: Dacite, Rhyolite
• Lithofacies: Hyaloclastite
• Lithofacies (Minor): Submarine pyroclastic flow deposit

• Distribution: Cape Wakkake - Cape Eboshi, Yoichi city, Yoichi county, Hokkaido

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