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Soashibetsugawa Formation

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

• Coherent formation
• Yezo forearc basin
• Early Cretaceous, Aptian (Radiolarians)

• Sedimentary facies: Marine
• Depth of water: Continental slope
• Depth of water: Bathyal
• Lithofacies: Siliceous mudstone
• Lithofacies (Minor): Felsic tuff

• Thickness: 700 m or thinner
• Lower limit: Conformity (Shirikishimanaigawa Formation)

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

• Distribution: Tomamae, Oyubari, Hokkaido
• Fossils: Radiolarians

• 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