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Sannoike Lava

• Type locality: eastern wall of Lake Sannoike, Otaki city, Kiso county, Nagano prefecture
• Volcanic rocks
• late Pleistocene (ca. 21 ka, K-Ar)

• Lithofacies: Olivine-bearing hornblende augite hypersthene andesite lava (7 flow units)
• Structures: Platy joint
• Paleocurrent: to East

• Source: Lake Sannoike, Mount Ontakeyama
• Thickness: ca. 80 m
• Running distance: ca. 5 km
• Lower limit: Unconformity (Shinoike volcano, Ichinoike volcano)

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

• Distribution: Lake Sannoike - Kaidaguchi mountain road - Yukawa river - Kaidakogen - Ontake ropeway, Otaki city, Kiso county, Nagano pref.

• Takeuchi et al. (1998) Geology of the Kiso-Fukushima District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 94p. (in Japanese with English abstract 4p.)
• Yamada and Kobayashi (1988) Geology of the Ontakesan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 136p. (in Japanese with English abstract 9p.)