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Aratozaki Formation Mabuti, 1933
- Type locality: Cape Aratozaki - Cape Akaiwa, Shizukawa, Minamisanriku city, Motoyoshi county, Miyagi prefecture
- Coherent formation
- Middle Jurassic, Bajocian
- Correlation: Nakahara Formation
- Sedimentary facies: Marine
- Lithofacies: Sandstone
- Lithofacies (Minor): Mudstone
- Lithofacies (Basal): Conglomerate
- Sedimentary structures: Trough cross-stratification, Planar cross-stratification, Flaser bedding
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Cape Aratozaki - Cape Akaiwa - Shizuhama seashore - Jao river - Komehiro - Hosoura - Nakazai - Kurosaki, Shizukawa, Minamisanriku city, Motoyoshi county, Miyagi pref.; Hinokuchi, Utatsu, Minamisanriku city, Motoyoshi county, Miyagi pref.
- Fossils: Cephalopods, Brachiopods, Corals
- Fossils (Bivalves): Camptonectes sp., Coelastarte sp., Ctenostreon sp., Cucullaea sp., Entolium sp., Fimbria sp., Inoceramus morii, Isocyprina sp., Modiolus sp., Myophorella sp., Oxytoma sp., Parainoceramus sp., Pholadomya sp., Trigonia sumiyagura, Vaugonia yokoyamai
- Ehiro and Morikiyo (2013) Jour. Geol. Soc. Japan, vol.119, Supplement, pp.47-67 DOI
- Takeuchi and Kaneko (1996) Geology of the Shizugawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 93p. (in Japanese with English abstract 5p.)
- Kamada (1993) Geology of the Tsuya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 70p. (in Japanese with English abstract 6p.)