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Yateikurasawa Lavas (Yamazaki et al., 1976) Mukai et al., 2009

Invalid synonym: Hacchokurasawa Formation

• Type locality: 1,250 - 1,300 m above sea level of Yateikura creek, Nagawa city, Chiisagata county, Nagano pref.
• Volcanic rocks
• Pleistocene

• Sedimentary facies: Debris flow deposit
• Lithofacies: Two pyroxene andesite, Hornblende two pyroxene andesite, Olivine two pyroxene andesite
• Lithofacies: Tuff breccia, Lava (3 - 4 flow units)

• Eruptive volume: 2.91 km³ or more
• Thickness (Average): ca. 200 m
• Thickness (A unit): 5 - 20 m
• Upper limit: Interfingered (Sanjiro Volcaniclastics), Unconformity (Lower Mitsumineyama Lava, Wadatoge Volcanics)
• Lower limit: Unconformity (Karasawa Granodiorite)

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

• Distribution: 1,200 - 1,450 m above sea level of Yateikura creek - Wada river, Nagawa city, Chiisagata county, Nagano pref.

• Mukai et al. (2009) Jour. Geol. Soc. Japan, vol.115, no.8, pp.400-422 DOI