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Masuporo Formation

• Coherent formation
• Foreland basins by collision between northeast Japan island arc and Kuril island arc
• middle Miocene

• Sedimentary facies: Marine
• Lithofacies: Turbidite
• Lithofacies: Conglomerate, Sandstone, Mudstone
• Sedimentary structures: Slump structures

• Upper limit: Unconformity (Wakkanai Formation)
• Lower limit: Conformity (Onishibetsu Formation)

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

• Distribution: Soya region, Hokkaido
• Distribution: Horonobe city, Teshio county, Hokkaido
• Fossils (Diatoms): Actinocyclus ingens, Dendiculopsis lauta, Dendiculopsis hyalina

• Kase et al., (2018) Jour. Geol. Soc. Japan, vol.124, no.8, pp.627-642 DOI
• Ishii et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.2, pp.41-52 DOI
• Niizato et al. (2007) Jour. Geol. Soc. Japan, vol.113, Supplement, pp.119-135 DOI