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Ainoyama Formation Tuzino et al., 2018

• Type locality: Ainoyama - Numanosawa, Ichinohe city, Ninohe county, Iwate prefecture
• Coherent formation
• early Miocene (19.9 Ma, FT)

• Sedimentary facies: Terrestrial, partly water bottom
• Lithofacies: Dacite lava, Hyaloclastite
• Lithofacies (Minor): Conglomerate

• Thickness: 230 m or thicker
• Thickness (Conglomerate): 3 m or thicker

• Upper limit: Unconformity (Asanai Terrace Deposit)

• Distribution: Ainoyama - Kotaki - Nakasato - Numanosawa, Ichinohe city, Ninohe county, Iwate pref.

• Tuzino et al. (2018) Geology of the Ichinohe District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 161p. (in Japanese with English abstract 4p.)