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Akebono Formation (Otsuka, 1938) Akiyama, 1957
Invalid synonym: Akebono Group
- Type locality: Oharajima - Osozawa, and Yogosawa - Hirasu, Minobu city, Minamikoma county, Yamanashi prefecture
- Coherent formation
- late Miocene - Pliocene
- Sedimentary facies: Marine
- Depth of water: Upper bathyal - Outer sublittoral
- Lithofacies:
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Oharajima - Osozawa - Yogosawa - Hirasu - Oshio - Kunari - Yasaiku - Nakayama - Furuhase - Fukuhara - Nashiko - Ejirikubo - Teuchizawa - Hinataminamizawa - Aimata - Odafunahara - Minobu, Minobu city, Minamikoma county, Yamanashi pref.; Jikkoku - Yanagawa, Fujikawa city, Minamikoma county, Yamanashi pref.
- Ozaki and Sugiyama (2018) Geology of the Minobu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 169p. (in Japanese with English abstract 7p.)