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Unit 3

Invalid synonym: Uf, Ug, Uh

• Coherent formation
• Yezo forearc basin
• Late Cretaceous, Campanian (Foraminifera)

• Sedimentary facies: Marine
• Depth of water: Continental shelf
• Depth of water: Middle - Upper bathypelagic (Foraminifera)
• Lithofacies: Sandy mudstone
• Lithofacies (Minor): Tuff, Tuffaceous sandstone, Turbidite sandstone

• Thickness: ca. 200 m
• Upper limit: The boundary between the sandy mudstone bed of Unit 3 and the overlying medium sandstone bed of Hakobuchi Formation
• Lower limit: bottom of Tomiuchibashi Tuff Bed

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

• Distribution: Mayachi creek, Mayachi, Yubari city, Hokkaito; Porosaru creek - Tosano creek, Mukawa city, Yufutsu county, Hokkaido
• Fossils: Inoceramus sp., Foraminifera

• Hayashi et al. (2011) Jour. Geol. Soc. Japan, vol.117, no.1, pp.14-34 DOI