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

• Type locality: Chitose, Tokamachi city, Niigata prefecture
• Tephra
• Miocene - Pliocene (2.9 Ma, FT)

• Lithofacies: Pumice tuff
• Sedimentary structures: Trough cross-stratification, Graded bedding

• Host: Higashigawa Formation
• Thickness: ca. 1.2 - 9 m

• Distribution: Chitose - Tazawa - Koyamaru - Mizunashi, Tokamachi city, Niigata pref.; Shibumi river, Murono, 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.)