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Nyukawa Pyroclastic Flow Deposit Kaneko et al., 1976
Invalid synonym: Arakigawa Pyroclastic Flow Deposit, Arakigawa Welded Tuff, Takahara Volcanic Rocks
- Type locality: Imami, Okuhidaonsengo, Takayama city, Gifu prefecture
- Tephra
- late Pliocene (2.5 - 1.76 Ma, K-Ar; 2.7 Ma, FT)
- Correlation: Ho-Kd39
- Intruded by: Basalt dykes
- Sedimentary facies: Pyroclastic flow deposit
- Sedimentary facies (Basal): Ground surge deposit
- Lithofacies: Augite hypersthene dacite welded tuff
- Lithofacies (Basal): Tuff, Breccia
- Sedimentary structures: Eutaxitic
- Sedimentary structures (Basal): Parallel stratification, Cross stratification
- Source: in the vicinity of Mount Hotaka
- Thickness: ca. 5 - 200 m
- Thickness (Basal): 0 - 1 m
- Distribution: 3,000 km2 or more
- Eruptive volume: 1300 km3 or more
- Upper limit: Unconformity (Fukuji Tuff Breccia, Kamitakara Pyroclastic Flow Deposit, Okuhida Pyroclastic Flow Deposit, Chayano Tuff, Miza Gravel Bed, Uwano Mudflow Deposit, Enako Gravel Bed, Sencho Lava, Kibyu Lava, Kibyu Volcaniclastic Rocks, Senchokita Lava, Suzurankogen Basalt)
- Lower limit: Unconformity (Sorayama Formation, Horatani Tonalite, Kasagatake Rhyolites, Matsubara Gravel Bed, Hikodani Welded Tuff, Higashimata-Funayama Welded Tuff, Obora Formation, Matsumoto Gravel Bed, Sawando Complex)
- Distribution: Imami - Senchogahara - Kasadani valley - Nigorigawa river - Kashiatedani valley - Uchigaido - Kamiokamoto town - Ishigadani valley - Nenoharakogen - Hikagedairayama - Iwaidani valley - Shiozodani valley - Kibyu - Suzurakogen, Takayama city, Gifu pref.; Ogura - Muroyama, Misato, Azumino city, Nagano pref.; Omine hills, Omachi city - Ikeda city, Kitaazumi county, Nagano pref.; Seba, Shiojiri city, Nagano pref.
- Harayama et al. (2009) Geology of the Matsumoto District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 63p. (in Japanese with English abstract 3p.)
- Takeuchi et al. (1998) Geology of the Kiso-Fukushima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 94p. (in Japanese with English abstract 4p.)
- Nakano et al. (1995) Geology of the Norikuradake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 139p. (in Japanese with English abstract 4p.)
- Harayama (1990) Geology of the Kamikochi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 175p. (in Japanese with English abstract 11p.)
- Yamada and Kobayashi (1988) Geology of the Ontakesan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 136p. (in Japanese with English abstract 9p.)
- Yamada et al. (1985) Geology of the Takayama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 111p. (in Japanese with English abstract 9p.)
- Kawada (1982) Geology of the Mikkamachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 72p. (in Japanese with English abstract 6p.)