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Okaburi Formation (Fujimoto et al., 1957) Adachi et al., 1999
Invalid synonym: Okamuri Formation
- Volcanic rocks
- Volcanic collapse basin deposit
- late Miocene (6.8, 6.2 Ma, FT)
- Correlation: Konarayama Volcanic Rock
- Intruded by: Dacite dikes
- Lithofacies (Upper): Andesitic tuff breccia
- Lithofacies (Lower): Conglomerate
- Lithofacies (Minor): Andesitic Welded tuff
- Distribution: Okanmuri - confluence of the Nakatsugawa river and Mujinazawa creek - confluence of the Nakatsugawa river and Koshinzawa creek, Nakatsugawa, Chichibu city, Saitama pref.
- Hara et al. (2010) Geology of the Mitsumine District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 110p. (in Japanese with English abstract 4p.)