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Sakugawa Formation

It had been included in Middle Yezo Group.

• Coherent formation
• Yezo forearc basin
• Late Cretaceous, Cenomanian - middle Turonian

• Sedimentary facies: Marine
• Lithofacies: Siltstone, Sandy siltstone

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

• Distribution: Chirashinai river, Nakagawa city, Nakagawa county, Hokkaido
• Fossils (Ammonoids): Mesopuzosia pacifica
• Fossils (Inoceramids): Inoceramus nakagawaensis (<= Inoseramus aff. concentricus)

• Takahashi (2010) Jour. Geol. Soc. Japan, vol.116, no.8, pp.412-417 DOI