[ Top ] [ Japanese ]

Ochiai Lake Deposit Akahane et al., 1992

• Type locality: Ochiai, Sugakawa, Yamanouchi city, Shimoakai county, Nagano prefecture
• Coherent formation
• Dammed lake deposit by Koshashukazantai Lava
• middle - late Pleistocene

• Lithofacies (Upper): Silt
• Lithofacies: Interbedded sands and silt
• Lithofacies (Minor): Gravels, Pyroclastic flow deposit
• Sedimentary structures: Cross stratification

• Thickness: ca. 90 m
• Lower limit: Unconformity (Hirao Volcanic Rocks, Kosha volcano)

• Distribution: Ochiai - Shimosugakawa, Sugakawa, Yamanouchi city, Shimoakai county, Nagano pref.
• Fossils: Plant fragments

• 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.)