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Lower Ogahana Lava (Kosaka et al., 2005) Mukai et al., 2009

Invalid synonym: Ogahana lava, Chausuyama Lava

• Type locality: 1,750 above sea level of Datekawarasawa creek, Matsumoto city, Nagano prefecture
• Volcanic rocks
• Pleistocene (1.53 Ma, K-Ar)

• Lithofacies: Two pyroxene andesite lava (a flow unit)

• Eruptive volume: 0.30 km³
• Thickness (Ogahana): ca. 100 m
• Thickness (Daimonsawa): ca. 30 m
• Upper limit: Unconformity (Upper Ogahana Lava)
• Lower limit: Unconformity (Datekawarasawa Sandstone Member, Nakayamasawa Lava)

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

• Distribution: 1,750 m above sea level of Datekawara creek, Matsumoto city, Nagano pref.; 1,700 - 1,750 m above sea level of the right bank of Daimon creek, Matsumoto city, Nagano pref.; 1,650 - 1,800 m above sea level of southern slope of Mount Ogahana, Matsumoto city, Nagano pref.

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