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Oshidomari Formation

• Type locality: Rishiri island, Hokkaido
• Coherent formation
• Miocene (9.9 - 9.16 Ma, Diatoms; 11.7 - 9.1 Ma, Radiolarians)

• Lithofacies: Diatomaceous mudstone

• Lower limit: Unconformity (Oshidomari-pon'yama Lava Dome)

• Distribution: Rishiri island, Hokkaido

• Ueki and Kondo (2010) Jour. Geol. Soc. Japan, vol.116, no.12, pp.686-689 DOI
• Ueki and Kondo (2010) Jour. Geol. Soc. Japan, vol.116, no.8, pp.437-440 DOI