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Nagasaki Formation (Tomizawa and Kitahara, 1967) Nagamori et al., 2010
Invalid synonym: lower Uchu Formation
- Type locality: Nagasaki, Otari city, Kitaazumi county, Nagano prefecture
- Coherent formation
- late? Miocene
- Intruded by: Rhyolite - Dacite dykes
- Lithofacies: Sandy mudstone, Muddy sandstone, Sandstone
- Sedimentary structures: Bioturbation
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Nagasaki - Ottatezawa creek - Nakayagawa river, Otari city, Kitaazumi county, Nagano pref.
- Fossils: Crabs (Cance (Metacarcinus) minutoserratus), Echinoids (Linthia nipponica), Trace fossils (Ophiomolpha isp.)
- Fossils (Shellfishes): Acila divaricata, Anadara amicula, Conchocele bisecta, Fontipecten sp., Glycymeris yamasakii, Lucinoma annulata, Mercenaria yokoyamai, Spisula polynyma alaskana, Panope japonica
- 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.)