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Kirigishiyama Olistostrome Member

Abbr.: KY-1

• Coherent formation
• Yezo forearc basin
• Early Cretaceous, Albian (Ammonoids, Foraminifera)

• Sedimentary facies: Marine
• Depth of water: Continental slope
• Lithofacies (Crusts): Interbedded sandstone and mudstone, Limestone

• Thickness: 580 m or thinner

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

• Distribution: Tomamae, Oyubari, Hokkaido
• Distribution: Soshubetsu river, Shimukappu city, Yufutsu county, Hokkaido
• Fossils: Rudists (family Requienia), Corals, Gastropods (Nerineids = Adiozoptyxis hidakaensis), Red algae
• Fossils (Orbitolina foraminifera): Praeorbitolina cf. wienandsi, Mesorbitolina parva, M. texana, Orbitolina lenticularis, Iraqia simplex

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