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Hakkin Muddy Sandstone Member

Abbr. KY-4

• Coherent formation
• Yezo forearc basin
• Late Cretaceous, Turonian (95.9, 93.1 Ma, K-Ar)

• Sedimentary facies: Marine
• Lithofacies: Muddy sandstone (muddy part comprises fine sand - silt, and is bluish green.)
• Lithofacies (Minor): Bentonitic tuff

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

• Distribution: northern Hobetsu, Mukawa city, Yufutsu county, Hokkaido

• 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
• Hayashi et al. (2011) Jour. Geol. Soc. Japan, vol.117, no.1, pp.14-34 DOI
• Ando et al. (2007) Jour. Geol. Soc. Japan, vol.113, Supplement, pp.185-203 DOI