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Yuchi Formation

• Coherent formation
• Pliocene - Pleistocene

• Sedimentary facies: Shallow marine
• Sedimentary facies: Continental shelf - Shoreface
• Lithofacies: Sandstone, Muddy sandstone
• Lithofacies (Minor): Tuff, Conglomerate

• Upper limit: Bottom of Conglomerate - Sandstone/Conglomerate bed
• Upper limit: Conformity (Sarabetsu Formation)
• Lower limit: Bottom of muddy sandstone bed
• Lower limit: Conformity (Koetoi Formation)

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

• Distribution: Soya region, Hokkaido
• Distribution: Horonobe city, Teshio county, Hokkaido
• Fossils: Fortipecten takahashii

• Ishii et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.6, pp.286-299 DOI
• Ishii et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.2, pp.41-52 DOI
• Niizato et al. (2007) Jour. Geol. Soc. Japan, vol.113, Supplement, pp.119-135 DOI