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Arato Formation Mabuti, 1929
- Type locality: Arato, Shizukawa, Minamisanriku city, Motoyoshi county, Miyagi prefecture
- Coherent formation
- Middle Jurassic, late Bajocian - early Callovian (Ammonoids)
- Correlation (Lower): Nakahara Formation
- Sedimentary facies: Marine
- Sedimentary facies: Storm-dominated shelf, Shoreface - Inner continental shelf
- Lithofacies: Sandy shale
- Lithofacies (Minor): Sandstone
- Sedimentary structures: Cross-stratification, Parallel stratification, Convolute lamination, Slump structures, Trace fossils
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Arato - Shizuhama seashore - Jao river - Nakazai - Hayashi - Tsubaki island, Shizukawa, Minamisanriku city, Motoyoshi county, Miyagi pref.; Kamisawa, Utatsu, Minamisanriku city, Motoyoshi county, Miyagi pref.
- Fossils: Belemnoids, Bivlaves (Inoceramus sp.)
- Fossils (Ammonoids): Bigotites sp., Cadomites bandoi, Calliphylloceras sp., Holcophylloceras cf. polyolcum, Idoceras sp., Kepplerites acuticostum, Kepplerites mabutii, Leptosphinctes cf. martiusi, Nannolytoceras sp., Oppelia sp., Parkinsonia sp., Thysanolyloceras sp.
- 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.)