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Hikage Formation

• Type locality: Shukudo - Komihara, Komi city, Manamisaku county, Nagano prefecture
• Coherent formation
• Dammed lake-fill deposit of Aikigawa river by Aikigawa Mudflow Deposit
• Pleistocene

• Sedimentary facies: Dammed lake-fill deposit
• Lithofacies: Peat, Sands, Gravels, Scoria
• Sedimentary structures: Cross stratification

• Thickness: 30 - 40 m
• Thickness (Peat): 15 m or thicker
• Upper limit: Unconformity (Honzawa Lava and Scoria, Kagikake Formation)
• Lower limit: Unconformity (Aikigawa Mudflow Deposit)

• Distribution: Shukudo - Komihara - Ichinosawa, Komi city, Manamisaku county, Nagano pref.; Hinata - Hikage - Horidaira, Minamiaiki city, Minamisaku county, Nagano pref.

• Kawachi (1974) Geology of the Tateshinayama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 114p. (in Japanese with English abstract 5p.)