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Haborogawa Formation Takashima et al., 2004

It had been included in Upper Yezo Group.

• Type locality: Nakafutamata river, Haboro city, Tomamae county, Hokkaido
• Coherent formation
• Yezo forearc basin
• Late Cretaceous, Turonian - Campanian (Ammonoids, Inoceramus sp.)
• Contemporaneous heterotopic facies (East): Kashima Formation

• Sedimentary facies: Marine
• Depth of water: Upper - Lower continental shelf, Continental slope
• Lithofacies (Upper): Mudstone, Sandstone, Sandy siltstone
• Lithofacies (Upper, Minor): Tuffaceous sandstone (KY-6)
• Lithofacies (Middle): Mudstone, Sandy siltstone, Turbidite sandstone
• Lithofacies (Lower): Mudstone, Sandy siltstone
• Lithofacies (Lower, Minor): KY-5

• Thickness: 1,750 - 2,250 m
• Upper limit: Transitional (Hakobuchi Formation)
• Lower limit: Conformity (Mikasa Formation)

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

• Distribution: Mikasa city - Mnaji, Kurisawa town, Iwamizawa city - Yubari city, Hokkaido
• Distribution: Haboro, Tomamae, Mikasa, western Kotanbetsu, Hokkaido
• Distribution: Kotanbetsu river, Onko creek, Nakanosawa creek, Uenosawa creek, Hotate creek, Yaguchi creek, Omagari creek, Kotanbetsu, Tomamae city, Tomamae county, Hokkaido
• Fossils: Ammonoids (Subprionocyclus neptuni, Baculites cf. yokoyamai, Mytiloides incertus), Inoceramus uwajimensis, Inoceramus teshioensis
• Key beds: KY-5 (Tuffaceous sandstone), KY-6 (Tuff)

• Takashima et al. (2018) Jour. Geol. Soc. Japan, vol.124, no.6, pp.381-398 DOI
• Tsujino (2009) Jour. Geol. Soc. Japan, vol.115, no.3, pp.122-129 DOI
• Ando et al. (2007) Jour. Geol. Soc. Japan, vol.113, Supplement, pp.185-203 DOI