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Aniai Formation Saito and Ozawa, 1956

Divided to Torisakagawa Formation, Utto Formation, and Kitanomatasawa Formation.

Invalid synonym: Aniai Group

• Coherent formation
• Miocene
• Correlation (Upper): Kaneyama Formation
• Correlation (Lower): Nozoki Formation

• Lithofacies (Upper): Shale, Rhyolite, Basaltic rocks, Sandstone = Kitanomatasawa Formation
• Lithofacies (Middle): Conglomerate, Sandstone, Tuff = Utto Formation
• Lithofacies (Lower): Basaltic rocks, Coal-bearing shale = Torisakagawa Formation

• Distribution: Akita pref.

• Kano et al. (2012) Geology of the Aniai District, 2nd Edition, 1:50,000 Quadrangle Series, Geological Survey of Japan, AIST, 59p. (in Japanese with English abstract 4p.)
• Ozawa and Sumi (1957) Moriyoshiyama, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 42p. (in Japanese with English abstract 5p.)