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Ikushunbetsu Formation Yabe and Aoki, 1924

• Type locality: Ikushunbetsu river, Mikasa city, Hokkaido
• Coherent formation
• Paleogene

• Sedimentary facies: Fluvial
• Sedimentary facies: Meandering river, Braided river
• Lithofacies: Sandstone, Siltstone, Coal

• Upper limit: Conformity (Hiragishi Formation), Unconformity (Poronai Formation)
• Lower limit: Conformity (Akabira Formation), Unconformity (Yubari Formation)

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

• Distribution: Ikushunbetsu river, Mikasa 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