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S1

Invalid synonym: lower Sorachi Group

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

• Lithofacies (Top): Basaltic breccia (MORB)
• Lithofacies (Top, Minor): Dolerite, Mudstone
• Lithofacies (Main): Tholeiite (MORB)
• Lithofacies (Main): Basalt (Lava, Pillow lava)

------ 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