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Yubari Formation Imai, 1924

• Type locality: Upper reaches of Shihorokabetsu river, Yubari city, Hokkaido
• Coherent formation
• Paleogene

• Sedimentary facies: Fluvial
• Sedimentary facies (Upper): Braided river
• Sedimentary facies (Lower): Meandering river
• Lithofacies: Siltstone, Coal, Interbedded sandstone and mudstone

• Upper limit: Conformity (Wakanabe Formation), Unconformity (Ikushunbetsu Formation)
• Lower limit: Conformity (Horokabetsu Formation)

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

• Distribution: Upper reaches of Shihorokabetsu river, Yubari city, Hokkaido; Mount Sankaku, Teimihuchi park, Yubari city, Hokkaido; Shikoro creek, Miruto, Kurisawa town, Iwamizawa city, Hokkaido

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