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Usonokuchi Gravel Bed Kawachi, 1974

Abbr.: US

• Type locality: 1,110 m above sea level of Matsui, Sakuho city, Minamisaku county, Nagano prefecture
• Coherent formation
• Sands and gravels at the mountain flank
• Pleistocene

• Lithofacies: Conglomerate
• Lithofacies (Minor): Scoriaceous volcanic ash, Scoria, Volcanic breccia

• Thickness: 15 - 60 m
• Upper limit: Unconformity (Inagodake Pyroclastic Flow Deposit, Yachiho Formation)
• Lower limit: Unconformity (Yagori Volcaniclastics, Komadeike Volcaniclastics, Kasuga Volcanic Rocks, Oishigawa Scoria)

• Distribution: Yakori - Usonokuchi - Saguchi, Sakuho city, Minamisaku county, Nagano pref.; Chiyosato - Oishigawa river, Komi city, Minamisaku county, Nagano pref.

• Nishiki et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.5, pp.193-211 DOI
• Kawachi (1974) Geology of the Tateshinayama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 114p. (in Japanese with English abstract 5p.)