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Kongodo volcano

Invalid synonym: Hyakkendaki Welded Tuff, Kanose Lava

• Type locality: Yukawa river, Kiso city, Kiso county, Nagano prefecture
• Volcanic rocks
• Stratovolcano
• late Pleistocene (ca. 66 ka, K-Ar)

• Lithofacies: Olivine-bearing augite hypersthene andesite, Hornblende-bearing augite hypersthene andesite, Olivine-bearing hornblende augite hypersthene andesite, Augite hypersthene andesite
• Lithofacies: Lava, Agglutinate, Pyroclastic flow deposit
• Sedimentary structures (Minor): Platy joints, Eutaxitic structure

• Source: Mount Kengamine, Mount Ontakeyama
• Thickness: 70 m or thicker
• Upper limit: Unconformity (Ichinoike volcano, Kusakidani volcano, Okunoin volcano)

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

• Distribution: Yukawa river - Shirakawa river - Nakanoyu - Ontake Ropeway, Kiso city, Kiso county, Nagano pref.; Akagawa river - Denjogawa river - Mount Mikasayama, Otaki city, Kiso county, Nagano pref.
• Tephra: On-Sn, On-Mt, On-Ys

• 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.)