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Hirono Formation Sasa, 1932

• Coherent formation
• middle Pleistocene

• Sedimentary facies: Shallow marine
• Lithofacies: Sands, gravels

• Thickness: 5 - 6 m
• Lower limit: Unconformity (Kuji Group, Noda Group, Minashi Formation, Plutonic rocks)

• Distribution: Iwate pref.

• Yoshida et al. (1987) Geology of the Rikuchu-Ono District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 70p. (in Japanese with English abstract 6p.)