[ Top ] [ Japanese ]

Koshashukazantai Lava Togashi and Akahane, 1991

• Type locality: summit of Mount Kosha, Nakano city - Yamanouchi city - Kjimadaira city, Shimoakai county, Nagano prefecture
• Volcanic rocks
• Stratovolcano
• Pleistocene (0.19 Ma, K-Ar)

• Lithofacies: Pyroxene andesite lava
• Lithofacies (Minor): Dykes, Hornblende-bearing pyroxene andesite

• Distribution (Diameter): ca. 4 km
• Thickness: 900 m or thinner
• Upper limit: Unconformity (Kosha Lithic Pyroclastic Flow Deposit)

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

• Distribution: summit of Mount Kosha, Nakano city - Yamanouchi city - Kjimadaira city, Shimoakai county, Nagano, Nagano pref.; Fukazawa - Akaiwa - Daikokuiwa, Nakano city, Nagano pref.

• Akahane et al. (1992) Geology of the Nakano District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 106p. (in Japanese with English abstract 4p.)