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Okusakainosawa Sandstone and Mudstone Member

• Coherent formation
• Yezo forearc basin
• Early Cretaceous, Albian (Ammonoids, Foraminifera)

• Sedimentary facies: Marine
• Depth of water: Continental slope
• Lithofacies: Interbedded turbidite sandstone and mudstone

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

• Distribution: Tomamae, Oyubari, Hokkaido
• Fossils: Ammonoids, Foraminifera

• Takashima et al. (2018) Jour. Geol. Soc. Japan, vol.124, no.6, pp.381-398 DOI