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Fukuji Tuff Breccia Kaneko et al., 1976

Invalid synonym: Osobudani Pumice Flow Deposit, Choshitani Formation

• Type locality: Osobudani valley, Okuhidaonsengo, Takayama city, Gifu prefecture
• Volcanic rocks
• Pleistocene

• Lithofacies: Tuff breccia
• Lithofacies (Minor): Biotite-bearing hornblende augite hypersthene dacite lava, Augite hypersthene dacite lava
• Lithofacies (Lower): Lapilli tuff
• Lithofacies (Basal): Conglomerate
• Sedimentary structures: Reversed graded bedding

• Thickness: 200 m
• Thickness (Lava): ca. 60 m
• Thickness (Lower): 2 - 6 m
• Thickness (Basal): 4 m or thicker
• Upper limit: Unconformity (Kamitakara Pyroclastic Flow Deposit)
• Lower limit: Unconformity (Sorayama Formation, Mizuyagadani Formation, Hirayu Complex, Nyukawa Pyroclastic Flow Deposit)

• Distribution: Osobudani valley - Mount Sorayama, Okuhidaonsengo, Takayama city, Gifu pref.; Osudani valley - Choshitani valley, Nyukawa town, 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.)