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Hikage Formation (Ishima and Endo, 1955) Nakano et al., 2002
Invalid synonym: Abuki Formation, Okura Formation, Obatake Formation, Imakuzure Formation
- Sedimentary facies: Lower shoreface, Inner continental shelf
- Depth of water: Fair-weather wave base, Storm wave base or shallower
- Lithofacies (Upper): Conglomerate, Sandstone
- Lithofacies (Lower): Sandstone
- Lithofacies (Bottom): Felsic tuff
- Lithofacies (Minor): Mudstone
- Sedimentary structures: Trough cross-stratification, Current ripples, Wave-formed ripples, Hummocky cross-stratification, Flame structures, Flute cast, Channel structure
- Paleocurrent: West to East
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Hikage, Kinasa, Nagano city, Nagano pref.; Shirochizawa creek, Sode, Ogawa city, Kamiminochi county, Nagano pref.
- Fossils: Laganidae gen. et sp. indet
- Fossils (Shellfishes): Anodontia sp., Crassostrea gigas
- Fossils (Trace fossils): Ophiomorpha isp., Rosselia isp.
- Tephra: Hkg50, Hkg60
- Nagamori et al. (2003) Geology of the Togakushi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 109p. (in Japanese with English abstract 3p.)
- 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.)
- Kato et al. (1989) Geology of the Omachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 111p. (in Japanese with English abstract 7p.)