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Minamishirasawa Formation Sato, 1982
- Type locality: Minamishirasawa creek, Kakkonda river, Shizukuishi city, Iwate county, Iwate prefecture
- Volcanic rocks
- Miocene - Pliocene (ca. 5 Ma, K-Ar)
- Lithofacies: Altered volcanic rocks, Pumice tuff
- Lithofacies (Minor): Sandy tuff, Conglomerate
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Kakkonda river - Azumai creek, Shizukuishi city, Iwate county, Iwate pref.
- Suto and Ishii (1987) Geology of the Shizukuishi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 142p. (in Japanese with English abstract 5p.)