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S2

Invalid synonym: upper Sorachi Group

• Coherent formation
• Oceanic island arc
• Early Cretaceous (Radiolarians)

• Lithofacies (Top): Felsic tuff
• Lithofacies (Main): Siliceous mudstone
• Lithofacies (Main, Minor): Sandstone
• Lithofacies (Bottom): Sandstone, Interbedded sandstone and siliceous mudstone

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

• Distribution: Sorachi river, Furano city, Hokkaido; Horokanai city, Uryu county, Hokkaido; Naegawa river, Nae, Nakafurano city, Sorachi county, Hokkaido; Nae river, Nae, Nakafurano city, Sorachi county, Hokkaido

• Takeshita et al. (2018) Jour. Geol. Soc. Japan, vol.124, no.7, pp.491-515 DOI