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Hikagenosawa Formation

It had been included in lower part of Middle Yezo Group.

• Coherent formation
• Yezo forearc basin
• Early Cretaceous, Albian - Late Cretaceous, Cenomanian (Ammonoids, Foraminifera)
• Contemporaneous heterotopic facies (Lower): Mikasa

• Sedimentary facies: Marine
• Depth of water: Continental shelf
• Depth of water: lower part of Upper bathypelagic
• Lithofacies: Mudstone
• Lithofacies (Minor): Felsic tuff, Interbedded sandstone and mudstone (KY-3)

• Thickness: 1,900 - 2,600 m
• Upper limit: Transitional (Mikasa Formation)

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

• Distribution: Hokkaido
• Key bed: KY-3

• Takashima et al. (2018) Jour. Geol. Soc. Japan, vol.124, no.6, pp.381-398 DOI
• Honda et al. (2011) Jour. Geol. Soc. Japan, vol.117, no.11, pp.599-616 DOI
• Ando et al. (2007) Jour. Geol. Soc. Japan, vol.113, Supplement, pp.185-203 DOI