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Maruyama Formation

Abbr. KY-2

It had been included in bottom of Middle Yezo Group.

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

• Sedimentary facies: Marine
• Depth of water: Continental slope
• Lithofacies: Felsic tuff, Tuffaceous sandstone
• Lithofacies (Bottom): Rhyolitic conglomerate

• Thickness: 500 m or thinner
• Lower limit: Conformity (Shuparogawa Formation, unconformity is denied.)

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

• Distribution: Soshubetsu river, Shimukappu city, Yufutsu county, Hokkaido

• 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