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Hirayukawa Pyroclastic Flow Deposit II (Hirayama, 1990)
- Type locality: Iwatsubodani valley, Okuhidaonsengo, takayama city, Gifu prefecture
- Tephra
- Pleistocene - Holocene
- Correlation: Shirataniyama Dome Lava III
- Sedimentary facies: Block-and-ash-flow deposit
- Lithofacies: Augite-bearing biotite hypersthene hornblende andesite - dacite
- Paleocurrent: from South
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Iwatsubodani valley - Hitoegane - Uechigane - Ipposui - Kaishiodani valley - Murakami, Okuhidaonsengo, Takayama city, Gifu pref.
- Oikawa et al. (2010) Jour. Geol. Soc. Japan, vol.116, Supplement, pp.49-61 DOI
- Harayama (1990) Geology of the Kamikochi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 175p. (in Japanese with English abstract 11p.)