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Abetsu Formation

• Coherent formation
• Foreland basins by collision between northeast Japan island arc and Kuril island arc
• middle Miocene (13.1 - 12.9 Ma, Diatoms)
• Correlation: Kawabata Formation, Upper Ponsubetsu Formation, Fureoi Formation, Upper Niniu Formation

• Sedimentary facies: Slope apron by sediment gravity flow
• Sedimentary facies: Turbidite
• Lithofacies: Interbedded sandstone and mudstone

• Lower limit: Transitional

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

• Distribution: Sakae, Mukawa city, Yufutsu county, Hokkaido; Atsuma dam, Atsuma city, Yufutsu county, Hokkaido; Hirotomi, Hidaka city, Saru county, Hokkaido

• Kase et al., (2018) Jour. Geol. Soc. Japan, vol.124, no.8, pp.627-642 DOI
• Okamura et al. (2010) Jour. Geol. Soc. Japan, vol.116, no.4, pp.181-198 DOI