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Ittori Formation Inoue et al., 1959

• Type locality: Niida, Odate city, Akita prefecture
• Coherent formation
• Miocene
• Correlation: Iwaya Formation, Fujikotogawa Formation

• Lithofacies (Upper): Sandstone
• Lithofacies (Middle): Pumice tuff
• Lithofacies (Lower): Mudstone
• Lithofacies (Bottom): Shale

• Thickness: 750 m
• Lower limit: Conformity (Hayaguchigawa Formation)

• Distribution: Niida, Odate city, Akita pref.

• Hirayama and Sumi (1963) Takanosu, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 90p. (in Japanese with English abstract 7p.)