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Shiraita Formation Chihara et al., 1981
- Type locality (Upper): Mount Akibasan, Yuzawa city, Minamiuonuma county, Niigata prefecture
- Type locality (Lower): Matsukawairi river, Yuzawa city, Minamiuonuma county, Niigata prefecture
- Coherent formation
- Miocene
- Intruded by: Quartz diorite, Porphyrite sill, Quartzporphyry dyke, Rhyolite dyke
- Correlation: Mantaroyama Shale Formation
- Lithofacies (Upper): Altered basalt lava (Pillow lava)
- Lithofacies (Upper, Minor): Shale
- Lithofacies (Lower): Shale, Hornfels
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Mount Akibasan - Matsukawairi river, Yuzawa city, Minamiuonuma county, Niigata pref.
- Chihara et al. (1981) Geology of the Echigo-Yuzawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 108p. (in Japanese with English abstract 8p.)