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Poronai Group Yabe and Aoki, 1924

• Coherent formation
• late Eocene - early Oligocene

• Sedimentary facies: Marine
• Sedimentary facies (Upper): Regressive deposits
• Sedimentary facies (Lower): Transgressive deposits
• Lithofacies: Siltstone, Sandstone

• Upper limit: Unconformity (Takinoue Formation)
• Lower limit: Unconformity (Ishikari Group, Yezo Group)

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

• Distribution: Atsuma city, Yufutsu county, Hokkaido

• Hoyanagi et al. (2007) Jour. Geol. Soc. Japan, vol.113, Supplement, pp.205-215 DOI
• Ando et al. (2007) Jour. Geol. Soc. Japan, vol.113, Supplement, pp.185-203 DOI