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S3
Invalid synonym: upper Sorachi Group
- Coherent formation
- Oceanic island arc
- Early Cretaceous, Valanginian - Barremian (Radiolarians)
- Lithofacies: Siliceous mudstone intercalated by felsic tuff
- Lithofacies (Minor): Basalt, Dolerite (Simultaneous with Naegawa Dolerite)
------ 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