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Lower pyroclastic flow deposit
- Type locality: 1,100 m above sea level, Iwatsubodani valley, Okuhidaonsengo, Takayama city, Gifu prefecture
- Tephra
- Pleistocene
- Sedimentary facies: Terrestrial
- Sedimentary facies: Pyroclastic flow deposit
- Lithofacies: Augite biotite hornblende hypersthene dacite
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Iwatsubodani valley - south of Mount Iwatsuboyama, Okuhidaonsengo, Takayama city, Gifu pref.
- Harayama (1990) Geology of the Kamikochi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 175p. (in Japanese with English abstract 11p.)