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Nagano Formation

Invalid synonym: Nagano Group, Yae Formation

• Type locality: Nagano, Satsuma city, Satsuma county, Kagoshima prefecture
• Coherent formation
• early Pleistocene (Younger than 2.5 Ma, FT)

• Lithofacies (Top): Dacite tuff
• Lithofacies (Upper): Andesite breccia
• Lithofacies (Middle): Interbedded sandstone and siltstone
• Lithofacies (Lower): Diatomaceous mudstone
• Lithofacies (Lower, Minor): Scoriaceous tuff
• Lithofacies (Bottom): Lapilli-bearing pumiceous tuff

• Thickness (Top-Upper): 370 m
• Thickness (Middle): 100 m
• Thickness (Lower-Bottom): ca. 400 m
• Upper limit: Unconformity (Chayagaoka Andesite, Nakadake Andesite, Komagadan Andesite)
• Lower limit: Unconformity? (Kanayama Andesite, Unconformity (Kiyoura Andesite)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Nagano, Satsuma city, Satsuma county, Kagoshima pref.

• Hikichi and Yamaji (2008) Jour. Geol. Soc. Japan, vol.114, no.10, pp.540-545 DOI
• Uchimura et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.3, pp.95-112 DOI