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Tamasato Formation (Shimakura and Tsuchida, 1939) Hirokawa and Yoshida, 1956

• Coherent formation
• Pliocene

• Lithofacies: Shale, Sandstone, Conglomerate
• Lithofacies (Minor): Lignite

• Thickness: 40 m or thicker
• Lower limit: Unconformity (Granite, Ultramafic rocks)

• Distribution: Hanamaki city, Iwate pref.
• Fossils (Plants): Juglans cinerea

• Hirokawa and Yoshida (1956) Ohazama, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 31p. (in Japanese with English abstract 9p.)
• Hirokawa and Yoshida (1954) Hitokabe, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 33p. (in Japanese with English abstract 14p.)