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

Invalid synonym: Ogahana lava, Chausuyama Lava

• Type locality: 1,900 above sea level of Mount Ogahana, Matsumoto city, Nagano prefecture
• Volcanic rocks
• Pleistocene (1.50 Ma, K-Ar)

• Lithofacies: Olivine hornblende two pyroxene andesite
• Lithofacies: Block lava (a flow unit)
• Paleocurrent: Northeast

• Eruptive volume: 0.96 km³
• Thickness (North): ca. 200 m
• Thickness (South): ca. 100 m
• Upper limit: Unconformity (Hyakumagari Volcaniclastics, Ogato Lava)
• Lower limit: Unconformity (Hirokoba lava, Lower Ogahana Lava)

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

• Distribution: 1,800 - 2,000 m above sea level of northern Utsukushigahara plateau, Nagano pref.; 1,750 - 1,850 m above sea level of southern Utsukushigahara plateau, Nagano pref.

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