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Yamaya Formation

• Type locality: The confluence of the Kaneyama river and the Uwadai river - Uwadai, Kaneyama city, Mogami county, Yamagata prefecture
• Coherent formation
• Pleistocene

• Lithofacies: Gravels
• Lithofacies (Minor): Sands, Clay, Dacite pumice tuff

• Source (Pumice tuff): Onikobe caldera

• Distribution: The confluence of the Kaneyama river and the Uwadai river - Uwadai, Kaneyama city, Mogami county, Yamagata pref.

• Ozawa and Sumi (1961) Uzenkaneyama, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 66p. (in Japanese with English abstract 5p.)