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Yubetsu Formation

• Coherent formation
• Middle - Late Eocene

• Sedimentary facies: Brackish
• Lithofacies (Upper): Massive mudstone
• Lithofacies (Lower): Interbedded sandstone and mudstone
• Sedimentary structures: Cross-stratification, Parallel stratification

• Upper limit: Lithofacies boundary
• Lower limit: Lithofacies boundary

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

• Distribution: Kushiro seashore, Kushiro city, Hokkaido
• Fossils: Bivalves (Corbicula sitakaraensis), Foraminifera

• Katagiri et al. (2016) Jour. Geol. Soc. Japan, vol.122, no.9, pp.495-503, DOI