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Tokachimitsumata Pyroclastic Fall Deposit Ishii et al., 2008

Abbr.: Tkm-pfa

Invalid synonym: Muka Pyroclastic Fall Deposit (Tokachimitsumata basin), Meto Pyroclastic Fall Deposit (Oribe-Osarushinai hills), Kuttari Pyroclastic Fall Deposit (upstreams of Tokachi river)

Abbr. (Invalid): Mk pfa, Mt pfa, Kt pfa

• Tephra
• Pleistocene (ca. 1 Ma)

• Sedimentary facies: Terrestrial

• Source: Tokachimitsumata caldera
• Mode of eruption: Plinian
• Thickness (Tokachimitsumata basin): 130 cm
• Thickness (Oribe-Osarushinai hills): 10 - 240 cm
• Thickness (upstreams of Tokachi river): ca. 15 cm
• Upper limit: Conformity (Tokachimitsumata Pyroclastic Flow Deposit)
• Lower limit (Tokachimitsumata basin): Unconformity (Tokorogawa Formation)
• Lower limit (Tokachimitsumata basin): Unconformity? (Sangoku Formation)
• Lower limit (Oribe-Osarushinai hills): Unconformity? (Ikeda Formation)
• Lower limit (upstreams of Tokachi river): Unconformity? (Iwamatsu Formation)
• Lower limit: Unconformity (Tokachi Pyroclastic Flow Deposit)
• Lower limit (HR-4): Unconformity (Ak10)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Tokachimitsumata basin, Kamishihoro city, Kato county, Hokkaido; Oribe, Kamishihoro city - Osarushinai hills, Otofuke city, Kato county, Hokkaido; Upper stream of Tokachi river, Hokkaido

• Hasegawa et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.7, pp.366-381 DOI
• Ishii et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.7, pp.348-365 DOI