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Okushiga Lake Deposit Akahane, 1977

• Type locality: Okushiga, Yamanouchi city, Shimotakai county, Nagano prefecture
• Coherent formation
• Pleistocene

• Sedimentary facies: Lacustrine
• Lithofacies (Upper): Volcanic sands
• Lithofacies (Lower): Tuffaceous silt
• Sedimentary structures (Lower): Parallel stratification, Slump structures

• Thickness: 20 m
• Upper limit: Unconformity (Dainenzan and Hikoemonzawa Pumice and Pyroclastic Flow Deposit)
• Lower limit: Unconformity (Kayanotaira Pyroclastic Flow Deposit)

• Distribution: Okushiga - Kobano creek, Yamanouchi city, Shimotakai county, Nagano pref.

• Shimazu and Tateishi (1993) Geology of the Naebasan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 90p. (in Japanese with English abstract 5p.)