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Buno Formation (Tomizawa and Kitahara, 1967) Nagamori et al., 2010
Invalid synonym: Otomiyama Formation, lower Hosogai Formation
- Type locality: Buno, Otari city, Kitaazumi county, Nagano prefecture
- Coherent formation
- Pliocene
- Lithofacies: Conglomerate, Sandstone
- Lithofacies (Minor): Gravel-bearing mudstone, Mudstone
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Buno - Ottatezawa creek, Otari city, Kitaazumi county, Nagano pref.
- Fossils: Shellfishes (Ostrea sp., Trapezium sp.), Plants (Metasequoia sp.)
- Nagamori et al. (2010) Geology of the Kotaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 130p. (in Japanese with English abstract 4p.)
- Nakano et al. (2002) Geology of the Shiroumadake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 105p. (in Japanese with English abstract 5p.)