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Shuparogawa Formation

It had been included in upper part of Lower Yezo Group.

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

• Sedimentary facies: Marine
• Depth of water: Continental slope
• Depth of water: Upper abbysal
• Lithofacies: Turbidite
• Lithofacies: Interbedded sandstone and mudstone

• Thickness: 800 - 2,540 m
• Upper limit: Conformity (Maruyama Formation, unconformity is denied.)

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

• Distribution: Tomamae, Oyubari, Hokkaido
• Key beds: KY-1

• Takashima et al. (2018) Jour. Geol. Soc. Japan, vol.124, no.6, pp.381-398 DOI
• Ando et al. (2007) Jour. Geol. Soc. Japan, vol.113, Supplement, pp.185-203 DOI