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Hirayukawa Pyroclastic Flow Deposit I (Harayama, 1990)

Invalid synonym: Takaharagawa Pyroclastic Flow Deposit

• Type locality: Iwatsubodani valley, Okuhidaonsengo, takayama city, Gifu prefecture
• Tephra
• Pleistocene (13 ka cal BP)
• Correlation: Shirataniyama Dome Lava III

• Sedimentary facies: Block-and-ash-flow deposit
• Lithofacies: Augite-bearing biotite hypersthene hornblende andesite - dacite
• Paleocurrent: from South

• Upper limit: Unconformity (Hirayukawa Pyroclastic Flow Deposit II), Abut unconformity (Hitoegane Debris Flow Deposit)
• Lower limit: Unconformity (Kumabokujo Pyroclastic Flow Deposit, Uechigane Pyroclastic Flow Deposit, Hitoegane Pyroclastic Flow Deposit, Hida Gaien Belt, Mino Belt, Funatsu Granitic Rocks, Tetori Group)

------ 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.)