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Sakamoto Group Otsuka, 1938

Invalid name. These strata were re-defined to Ryukawa Formation, Koshidomaezawa Formation, Yamatsuda Formation in ascending order.

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

• Distribution: Sakamoto, Hashiba, 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.)