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Momijiyama Formation (Murata, 1933) Fujioka, 1941

• Type locality: Yubari river, Momijiyama, Yubari city, Hokkaido
• Coherent formation
• early Oligocene (Calcareous nannofossils; 33.9 Ma, FT)

• Sedimentary facies: Shallow marine
• Sedimentary facies: Regressive deposit
• Depth of water: Shallow (Foraminifera)
• Lithofacies (Upper): Siltstone
• Lithofacies (Upper, Minor): Tuffaceous sandstone
• Lithofacies (Lower): Sandstone
• Lithofacies (Lower, Minor): Conglomerate

• Thickness: 480 m or thinner

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

• Distribution: Yubari river, Momijiyama, Yubari city, Hokkaido; Kamihoronai, Atsuma city, Yufutsu county, Hokkaido

• Takahashi et al. (2011) Jour. Geol. Soc. Japan, vol.117, no.10, pp.565-578 DOI
• Hoyanagi et al. (2007) Jour. Geol. Soc. Japan, vol.113, Supplement, pp.205-215 DOI