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Okawaratoge Pyroclastics Takahashi and Nishiki, 2006
- Type locality: Okawara pass, Saku city, Nagano prefecture
- Volcanic rocks
- early Pleistocene (0.98 Ma, K-Ar)
- Lithofacies: Basalt
- Lithofacies (Main): Welded pyroclastic rocks, Lavas (more than 15 flow units)
- Lithofacies (Minor): Agglutinates, Volcanic bombs
- Source: Tokin-no-iwa rock - Okawara pass
- Eruptive volume: 1.6 km3
- Thickness (Overall): 150 m
- Thickness (A unit): 1 - 5 m
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: 1,900 - 2,100 m above sea level, Okawara pass, Saku city, Nagano pref.
- Nishiki and Takahashi (2012) Jour. Geol. Soc. Japan, vol.118, no.8, pp.499-515 DOI