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Soya Coal-bearing Formation

• Coherent formation
• Foreland basins by collision between northeast Japan island arc and Kuril island arc
• early - middle Miocene

• Sedimentary facies: Marine
• Lithofacies: Sandstone
• Lithofacies (Minor): Conglomerate, Mudstone

• Upper limit: Unconformity (Onishibetsu Formation)
• Lower limit: Unconformity (Cretaceous, Paleogene)

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

• Distribution: Soya region, Hokkaido
• Distribution: Horonobe city, Teshio county, Hokkaido

• Niizato et al. (2007) Jour. Geol. Soc. Japan, vol.113, Supplement, pp.119-135 DOI