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Ishikurayama Formation Ozawa et al., 1985

• Type locality: Uwadai - Mount Ishikura, Mitane city, Yamamoto county, Akita prefecture
• Coherent formation
• Pleistocene
• Correlation: High I Terrace Deposit

• Sedimentary facies: Eolian, Sand dune deposit
• Sedimentary facies (Lower): Marine
• Climate: Temperate (Plants)
• Lithofacies (Upper): Sands
• Lithofacies (Lower): Gravels, Sands
• Lithofacies (Lower, Minor): Mud
• Sedimentary structures: Parallel stratification, Cross stratification

• Thickness: 5 - 30 m
• Thickness (Lower): 2 - 8 m
• Upper limit: Unconformity (Katanishi Formation)
• Lower limit: Unconformity (Koyanosawa Formation, Funakawa Formation, Onnagawa Formation)

• Distribution: Uwadai - Mount Ishikura, Mitane city, Yamamoto county, Akita pref.
• Fossils (Plants): Cryptomeria japonica, Fagus crenata, Juglans ailanthipolia, Larix leptolepis, Menyanthes trifoliata, Styrax obassia, Thujopsis dolabrata, Trapa bispinosa, Trapa manshurica

• Ozawa et al. (1985) Geology of the Ugo-Hamada District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 57p. (in Japanese with English abstract 4p.)