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• Coherent formation
• Yezo forearc basin
• Late Cretaceous

• Sedimentary facies: Marine
• Lithofacies: Sandy mudstone, Sandstone

• Upper limit: Transitional (Hakobuchi Formation)

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

• Distribution: Kotanbetsu, Tomamae city, Tomamae county, Hokkaido
• Fossils (Trace): Phycosiphon isp.

• Tsujino (2009) Jour. Geol. Soc. Japan, vol.115, no.3, pp.122-129 DOI