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Masuura Formation

• Coherent formation
• middle Miocene
• Contemporaneous heterotopic facies: Abashiri Formation

• Lithofacies: Sandstone, Mudstone

• Thickness: 0 - 230 m

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

• Distribution: Hokkaido
• Distribution: Diatoms

• Motoyama et al. (2018) Jour. Geol. Soc. Japan, vol.124, no.7, pp.517-532 DOI