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- Type locality: Katakura creek, Tazawako, Senboku city, Akita prefecture
- Volcanic rocks
- Pleistocene - Holocene
- Lithofacies: Clinopyroxene-bearing olivine basalt lava
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Katakura creek, Tazawako, Senboku city, Akita 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.)