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Azamihira Hornblende Tuff Niigata University Research Group of Geology in Higashikubiki District, 1987

• Type locality: Sabaishi river, Azamihira, Matsudai, Tokamachi city, Niigata prefecture
• Tephra
• Miocene - Pliocene

• Lithofacies: Hornblende andesite lapilli tuff (1 - 11 units)

• Host: Tamugigawa Formation
• Thickness (Overall): ca. 0.7 - 30 m
• Thickness (A unit): 10 - 40 cm

• Distribution: Sabaishi river, Azamihira, Matsudai, Tokamachi city, Niigata pref.; Tamugi, Oshima ward, Joetsu city, Niigata pref.; Ishiguro river, Yoriai, Takayanagi town, Kashiwazaki city, Niigata pref.; Koarato, Tokamachi city, Niigata pref.

• Takeuchi et al. (2000) Geology of the Matsunoyama Onsen District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 76p. (in Japanese with English abstract 5p.)
• Kobayashi et al. (1989) Geology of the Okanomachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 112p. (in Japanese with English abstract 5p.)