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Upper Haborogawa Formation Okamoto et al., 2003

• Coherent formation
• Yezo forearc basin
• Cretaceous, Santonian (Ammonoids)
• Contemporaneous heterotopic facies: Upper Kashima Formation

• Sedimentary facies: Marine
• Lithofacies (Top): Granule gravel-bearing sandstone
• Lithofacies (Main): Sandy siltstone, Siltstone
• Lithofacies (Minor): Tuffaceous sandstone (KY-6)

• Thickness (Overall): 80 m or thicker
• Thickness (Top): ca. 20 m
• Upper limit: Lithofacies boundary (The boundary between coarse sandstone and upper silty sandstone)

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

• Distribution: Miginosawa creek, Haboro river, Haboro city, Tomamae county, Hokkaido
• Fossils (Ammonoids): Neophylloceras ramosum, Phyllopachyceras ezense, Gaudryceras tenuiliratum, Tetragonites glabrus, Eubostrychoceras sp., Heteroptychoceras obatai, Polyptychoceras yubarense, Polyptychoceras haradai, Hauericeras angustum, Eupachydiscus haradai, Yokoyamoceras ishikawai, Naefia matsumotoi

• Takashima et al. (2018) Jour. Geol. Soc. Japan, vol.124, no.6, pp.381-398 DOI
• Kawabe and Okamoto (2012) Jour. Geol. Soc. Japan, vol.118, no.12, pp.769-781 DOI