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Otsutsumi Formation Nakamura, 1941 ex Kitamura et al., 1983
- Type locality: Miyatoko river, Dodokoro, Izumi ward, Sendai city, Miyagi prefecture
- Volcanic rocks
- middle Miocene
- Lithofacies: Pyroxene andesite tuff breccia, Volcanic conglomerate, Volcanic breccia, Lapilli tuff, Sandstone, Conglomerate
- Lithofacies (Minor): Acidic tuff, Siltstone, Pyroxene andesite lava, Basalt lava
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Miyatoko river, Dodokoro - Hasekura river - Mount Byobu, Izumi ward, Sendai city, Miyagi pref.
- Fossils: Brachiopoids (Coptothyris sp.), Balanus sp., Ostracods, Trace fossils (Boring shells)
- Fossils (Shellfishes): Chlamys kaneharai, Chlamys miyatokoensis, Miyagipecten matsumoriensis, Mizuhopecten sp.
- Fossils (Foraminifera): Amphicoryna pauciloculata, Anomalinoides glabrata, Astrononion sp., Bolivina sp., Buccella cf. frigida, Cassidulina cf. yabei, Cibicides aknerinus, Cibicides lobatulus, Cibicides mediocris, Cibicides cf. refulgens, Cibicides tani, Dentalina inflexa, Discorbinella sp., Discorbis cf. australis, Discorbitura sp., Elphidium cf. sendaiense, Eponides repandus, Fissurina marginata, Fissurina orbignyana, Fursenkoina mexicana, Glabratella cf. obtusa, Glabratella cf. opercularis, Glabratella ozawai, Globigerina falconensis, Globigerina praebulloides, Globigerinita glutinata, Globigerinoides quadrilobatus immaturus, Globocassidulina margareta, Globocassidulina nipponensis, Globorotalia continuosa, Globorotalia cultrata, Globorotalia miozea conoidea, Globorotalia miozea miozea, Globorotalia scitula, Globorotalia cf. siakensis, Guttulina kishiouyi, Hanzawaia nipponica, Hanzawaia tagaensis, Heronallenia sp., Hyalinea? sp., Lagena apiopleura, Lenticulina nicobarensis, Lenticulina orbicularis, Martinottiella communis, Melonis aomoriensis, Melonis nicobarensis, Melonis pacificus, Melonis pompilioides, Nodosaria longiscata, Nonionellina sp., Oolina melo, Orbulina suturalis, Planulinoides sp., Porosorotalia sp., Pullenia bulloides, Rosalina bradyi, Sigmomorphia sp., Siphotextularia sp., Sphaeroidina japonica, Stilostomella lepidula, Trifarina hughesi, Trifarina kokozuraensis, Vaginulina sp., Valvulineria nipponica
- Fossils (Calcareous nannofossils): Calcidiscus leptoporus, Calcidiscus macintyrei, Coccolithus miopelagicus, Coccolithus pelagicus, Cricolithus jonesi, Dictyococcites antarctica, Discoaster variabilis, Discolithina japonica, Helicosphaera carteri, Helicosphaera cf. sellii, Reticulofenstra pseudoumbilica, Sphenolithus moriformis
- Kitamura et al. (1983) Geology of the Yoshioka District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 50p. (in Japanese with English abstract 5p.)