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Wakkanai Formation (Watanabe, 1918) Fukuzawa, 1985
- Coherent formation
- Foreland basins by collision between northeast Japan island arc and Kuril island arc
- late Miocene
- Sedimentary facies: Marine
- Lithofacies: Siliceous turbidite
- Lithofacies: Siliceous shale, Diatomaceous mudstone
- Lithofacies (Minor): Tuff
- Sedimentary structures: Clear bedding planes
- Upper limit: Top of the bed with clear bedding planes
- Upper limit (previous definition): boundary of Opal-A/Opal-CT
- Upper limit: Transitional (Koetoi Formation)
- Lower limit: Unonformity (Masuporo Formation)
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Soya region, Hokkaido
- Distribution: Horonobe city, Teshio county, Hokkaido; Nukanan river of Toikanbetsu river, Horonobe city, Teshio county, Hokkaido
- Kase et al., (2018) Jour. Geol. Soc. Japan, vol.124, no.8, pp.627-642 DOI
- Ishii et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.6, pp.286-299 DOI
- Ishii et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.2, pp.41-52 DOI
- Niizato et al. (2007) Jour. Geol. Soc. Japan, vol.113, Supplement, pp.119-135 DOI