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Okkoto Lava

• Volcanic rocks
• Pleistocene

• Lithofacies: Hornblende-bearing hypersthene augite, Augite olivine andesite lava

• Thickness: 1 - 2 m
• Upper limit: Unconformity (Nirasaki Debris Avalanche Deposit)

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

• Distribution: Tatsuba river, Okkoto, Fujimi city, Suwa county, Nagano pref.; Koroku river - Yokobuki, Fujimi city, Suwa county, Nagano pref.

• Kawachi (1977) Geology of the Yatsugatake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 92p. (in Japanese with English abstract 4p.)