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Toya Pyroclastic Flow Deposit Machida et al., 1987

Abbr.: Toya

Synonym: Toya Pumice Flow Deposit, Toya Tuff, Shiro Tuff (Kamikita plain, Aomori pref., WT)

• Type locality: Toyako city, Abuta county, Hokkaido
• Volcanic rocks
• Pleistocene (106 ka; 132 - 113 ka, TL; ca. 112 ka, ¹⁸O)

• Lithofacies: Pyroclastic flow deposit, Pyroclastic surge deposit
• Lithofacies: Volcanic ash

• Source: Toya volcano
• Host: Konopporo Formation, Katanishi Formation, Older Dune, Kakumazaki Mud Member, Matsukizawa Sand and Gravel Member, Aobunayama Pyroclastic Rocks and Lava
• Thickness: 5 - 20 cm
• Lower limit: Unconformity (Kaminagawa Formation, Osarugawa Tephra)

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

• Distribution: Toyako city, Abuta county, Hokkaido; Ishikari lowland, Hokkaido
• Distribution: Hayakita-Mizuho, Abira city, Yufutsu county, Hokkaido; Kowa, Atsuma city, Yufutsu county, Hokkaido; Anden seashore, Kamikita plain, Aomori pref.; Oga city, Akita pref.; Asanai - Sotoyama, Ninohe city, Iwate pref.; Kokarumai, Karumai city, Kunohe county, Iwate pref.; Asanai - Omagari, Noshiro city, Akita pref.

• Nakagawa et al. (2018) Jour. Geol. Soc. Japan, vol.124, no.7, pp.473-489 DOI
• Tuzino et al. (2018) Geology of the Ichinohe District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 161p. (in Japanese with English abstract 4p.)
• Ganzawa et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.9, pp.470-478 DOI
• Kudo (2005) Geology of the Towada District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 79p. (in Japanese with English abstract 3p.)
• Yoshida et al. (1987) Geology of the Rikuchu-Ono District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 70p. (in Japanese with English abstract 6p.)