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Oashi Formation Hanzawa, 1954
- Type locality: Hebiishizawa creek - Higashisuzuzawa? creek, Jizogi, Kashima ward, Minamisoma city, Fukushima prefecture
- Coherent formation
- Middle Permian
- Correlation: Kanokura Formation
- Sedimentary facies: Marine
- Lithofacies: Sandstone
- Lithofacies (Minor): Shale, Sandy shale, Limestone, Conglomerate
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Hebiishizawa creek - Higashisuzuzawa? creek, Jizogi, Kashima ward, Minamisoma city, Fukushima pref.; Oashi, Haramachi ward, Minamisoma city, Fukushima pref.
- Fossils: Trilobites (Pseudophillipsia sp.), Bivalves (Aviculopecten sp., Schizodus sp.), Fusulinids (Monodiexodina matsubaishi)
- Fossils (Brachiopods): Hustedia sp., Leptodus sp., Linoproductus cora, Martinia sp., Megousia koizumii, Punctospirifer? sp., Spiriferella keilhavii, Spiriferellina cristata
- Fossils (Limestone gravels, Corals): Waagenophyllum indicum, Wentzelloides maiyaensis
- Fossils (Limestone gravels, Fusulinids): Lepidolina cf. toriyamai, Parafusulina sp., Pseudodoliolina sp., Schwagerina sp., Sumatrina sp., Verbeekina sp., Yabeina sp.
- Yanagisawa et al. (1996) Geology of the Somanakamura District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 114p. (in Japanese with English abstract 9p.)
- Kubo et al. (1990) Geology of the Haramachi and Omika District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 138p. (in Japanese with English abstract 7p.)