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Iwamatsu Formation

• Coherent formation
• Pleistocene

• Upper limit: Unconformity? (Tokachimitsumata Pyroclastic Fall Deposit)
• Lower limit: Unconformity? (Tokachi Pyroclastic Flow Deposit)

• Distribution: Upper stream of Tokachi river, Hokkaido

• Ishii et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.7, pp.348-365 DOI