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Ainaizawa Formation Oguchi and Isato, 1977

• Type locality: Ainai creek, Tazawako, Senboku city, Akita prefecture
• Coherent formation
• Pleistocene

• Sedimentary facies: Lacustrine
• Lithofacies: Interbedded gravels, sands and silt

• Thickness: 100 - 115 m
• Lower limit: Unconformity (Obonai Formation, Kunimitoge Formation, Tamagawa Welded Tuff)

• Distribution: Ainai creek - Osawa creek, Tazawako, Senboku city, Akita pref.
• Fossils (Obonai flora): Plants

• Suto and Ishii (1987) Geology of the Shizukuishi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 142p. (in Japanese with English abstract 5p.)