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Takaoka Formation (Kawai, 1950) Huzioka and Kano, 1966

• Type locality: Takaoka, Kawabe, Akita city, Akita prefecture
• Coherent formation
• Pleistocene
• Correlation: Shibikawa Formation

• Sedimentary facies: Marine, Fluvial
• Depth of water: Shallow marine
• Lithofacies: Sandstone
• Lithofacies (Basal): Gravels
• Lithofacies (Minor): Acidic tuff, Sandy tuff, Peat

• Thickness: 30 - 100 m
• Thickness (Basal): ca. 5 m
• Upper limit: Unconformity (Katanishi Formation)
• Lower limit: Unconformity (Sasaoka Formation)

• Distribution: Takaoka, Kawabe, Akita city, Akita pref.; Wada basin, Akita pref.

• Nishikawa et al. (2008) Jour. Geol. Soc. Japan, vol.114, Supplement, pp.75-85 DOI
• Ozawa et al. (1981) Geology of the Taiheizan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 69p. (in Japanese with English abstract 4p.)
• Huzioka et al. (1977) Geology of the Akita District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 69p. (in Japanese with English abstract 5p.)
• Huzioka et al. (1976) Geology of the Ugo-Wada District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 65p. (in Japanese with English abstract 5p.)