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Ishikari Group

• Type locality: Ishikari plain, Hokkaido
• Coherent formation
• middle Eocene

• Sedimentary facies: Shallow marine, Fluvial
• Sedimentary facies: Meandering river, Braided river, Esturay, Inner bay, Shoreface, Continental shelf

• Thickness (Sorachi): 2,400 m
• Thickness (Yubari): 800 m
• Upper limit: Unconformity (Poronai Group)
• Lower limit: Unconformity (Yezo Group)

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

• Distribution: Hokkaido

• Takashima et al. (2018) Jour. Geol. Soc. Japan, vol.124, no.6, pp.381-398 DOI
• Hoyanagi et al. (2007) Jour. Geol. Soc. Japan, vol.113, Supplement, pp.205-215 DOI